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Topics - JETZcorp

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16
Non-Moto / Crazy Ideas Competition!
« on: July 23, 2010, 01:44:37 PM »
Here's an idea.  A while ago, there was a contest to see who could come up with the most interesting uses for a Chrysler 426 Hemi, and I think it would be fun for us to brainstorm creative or unusual applications that would be improved by the two-stroke engine.  If at all possible, write your submissions in the voice of an advertisement.

I'll start this off with something relatively mild and traditional.  A two-stroke wheelchair!  Perfect for anyone who has gone over the bars just before an unfortunate landing, or found themselves caught unawares by their new 450F laying down a thick dose of engine braking in midair whilst attempting to jump a triple.  With this device, even Steven Hawking can know the pleasures of roosting a new Marianas Trench, or rolling down the sidewalk on a wheelie.  Base models come with a kick-start, electric start optional.

17
Vintage Two Strokes / Safety Gear Thread...
« on: July 21, 2010, 04:32:10 PM »
Well shit, unless he plans on slamming into trees, riding directly behind someone who's spraying rocks from the back tire, or using his feet as brakes, I don't see where a KX60 would generate a need for boots.  I've done 70 mile rides on a 250 in Nikes and only found one problem (my feet got cold.)  Of course, boots are better, and it's worth the effort to go find some, but don't let that cancel or delay any riding!

Edit: I just edited the title and not the post. This is split off from the KX60 rebuild thread. I thought this was a good forum since many vintage fans I know enjoy riding with minimal gear.

-Coop (Mike)

18
Photos & Videos / Cycles is a Mean Toy
« on: July 17, 2010, 09:30:11 PM »
Public Safety Announcement from JETZcorp Motors!

Cycles is a Mean Toy

19
Photos & Videos / Meet the 120
« on: July 17, 2010, 12:32:50 AM »
There's not much to say that hasn't been said.  I'll just copy the video description in here.

Quote from: Me
This is the best bike in the world. I don't care what you say, or what you have, this is better.

It's a 1967 Kawasaki 120 Road Runner. Originally, it started life as a bit of a turd, being designed as an enduo with a goofy speedometer, goofy headlight, goofy luggage rack on the fender, bizarre 2 x 4 speed transmission, no expansion chamber, and practically no suspension front or back. This one, however, has been modified.

Let's go front-to-back. The crappy forks have been replaced by a new set from a Suzuki about a decade newer, complete with about twice the travel, and leading-axle. All the street-legal stuff has been removed for a bare, aggressive-looking bike. The stock chrome pipe was traded for a hot expansion chamber with no silencer whatsoever, which not only made the bike loud, but gave it unbelievable power and torque, with instant response from the 1/8-turn throttle. The old shocks which looked like mozzarella string cheese were replaced by high-end Girlings and forward-mounted for more travel and better action.

This is the only bike I've ever ridden, aside from a 490 Maico, that can raise the front wheel on-command in either first or second, regardless of where the rider has his weight. It isn't very big on horsepower, but its torque is legendary. Once it was drag-raced against a Hodaka Ace 100, and the race was surprisingly a tie. Then the two were taken to a motocross track, and whenever there was the slightest incline, the 120 would absolutely disappear into the distance.

Meet the 120

If you're watching this right after I posted it, the quality may not be up to snuff quite yet.  Also, I've created a new YouTube channel entirely dedicated to bike stuff, so go ahead and subscribe to JETZcorpMotors if you want.

20
Photos & Videos / Anybody Else Ride Like This?
« on: July 08, 2010, 10:25:16 PM »
So, after doing this for literally the entire time I've been riding, I realized that perhaps not many people who go riding have done this.  What I'm talking about is, you've got a fire-road (or whatever kind of road that's wide enough for a truck) and two riders, so one guy takes one lane and another guy takes the other, and you just cruise in parallel.  When I went riding with someone who's not in my normal group of riders, he said he'd never done it before and it made him uncomfortable.

Cruising in Stereo

21
Vintage Two Strokes / What the 250F Used to Be
« on: July 01, 2010, 12:21:59 AM »
I was browsing this great collection of old bike tests and thought I'd read what the testers thought about this 250cc four-stroke Kawasaki in 1979.  It's pretty comical.  You get the impression that the KX125 bits are all awesome and the motor just sucks.  Why not just buy a KX125?

http://motorbikearchives.com/Bike-Tests/Enduro/Kawasaki-KLX250-1979-Cycle-Guide.html

Quote
Experienced motocross racers, expert dirt riders and those who like their horsepower doled out in megadoses will be bored stiff before they ever snick the five-speed gearbox into top cog for the first time. Oh, sure, there's no peakiness at all to be found in the powerband, and the torque curve has a nice, flat profile that's ideal for a dirt bike. The problem is that the curve never gets very high between kick-starting speed and valve-float rpm.

22
Photos & Videos / 490 vs 250
« on: June 29, 2010, 02:00:21 PM »
I wish I wasn't the one on the 250.  It was like trying to win a top-fuel drag race in a stock Model T.

From the 490's perspective:
Wide Open with JetZCorp

From the 250's perspective:
Going Ballistic with Tobyeo

23
Photos & Videos / Quick Blast on the 390CR
« on: June 22, 2010, 12:42:40 AM »
All the information for this one's in the video description.  Just click on the link if you want to see it.  But let met just say this.  If you ever come across a good deal on a Husky 390, go for it.  Seriously, 250cc really starts to feel inadequate after you've messed around with something bigger.  They're fun to ride because they make you work for the power, but it's seriously refreshing to be able to pull your way up some crazy hill at 1200 revs, and THEN have all that two-stroke powerband to play with once you hit a fast section.  I highly encourage anyone looking for a playbike to think of 350cc as a minimum.

Powerline Trail

24
Photos & Videos / Hey, I Made This!
« on: May 08, 2010, 09:09:00 PM »
This was a school project for Physics last year.  I guess it's more about engineering than it is physics, but it's still fairly cool, I think.  Especially considering that I made this without a video card in my computer.

Physics of the Ride

25
Photos & Videos / 490 Maico First-Timer
« on: May 02, 2010, 08:43:20 PM »
Sorry, Opferman if you were waiting to post this, but I just had to share your video as soon as I saw it.  This, ladies and gentlemen, is why no one can shut up about 490s.

Trask - Ankur Rides the 1982 Maico 490

26
Vintage Two Strokes / Kickstarters: Left or Right?
« on: April 30, 2010, 03:28:37 PM »
Welcome to the great kickstarter debate/discussion/thing.  At the veiled recommendation of TMKIWI, I'm making this thread in here because it's come up a couple of times and I'm curious to see what people think.  I think you all know that I'm a left-side kick guy, but I think it's reasonable to say that most riders aren't, considering that just about everything aside from Maico runs right-side.  So, let me know what you think, and hopefully we'll all understand each other and flowers will bloom worldwide, only to be thrown skyward by a fresh Metzler.

27
General Two Stroke Talk / Husqvarna Creates New Stealth Bike
« on: April 26, 2010, 07:59:02 PM »
Okay, so these pictures aren't of a two-stroke, but I suspect the 125CR will get a similar treatment to this 2011 four-stroke thing.  Found this on MXSimulator.com, and I thought it was interesting.  Certainly not a fan of where they went with the styling, I honestly prefer how they look now, but some of the engineering is interesting.  Note the position of the front sprocket, which is something I gather BMW have a patent on, or something.  What really makes it interesting is that I was thinking of ways of designing an engine with its sprocket there, myself. :D









Oh, and here's one of the responses to the bike on MXS that stood out.   ???
Quote from: mxer323
i for one would never buy anything other then the big 4.

28
Vintage Two Strokes / Spring Ride of 2010
« on: April 12, 2010, 09:19:13 PM »
From the people who brought you the Spring Ride of 2009, comes the 2010 Ride Report!

Friday, 09 April

I sat at the kitchen table at 4:30 in the afternoon.  School had been out for about an hour and a half, and that time had been used to pack anything that could conceivably be needed in the forest.  Let's see... spare pants, Bigfoot shirt, 50lb math book, iPhone, that's about it!  After a few minutes, the big green '98 Ram pulled into the driveway and backed aimed the tailgate to the garage.  Ten minutes later, the '82 Husky 250CR was loaded in the back and we were rolling to his house.  Another driveway, another garage, and soon another Husqvarna was loaded into the truck, this one a '79 390CR.



By around six, we had the trailer hooked up and were on our way to the camp, located on what will be identified only as the "Archery Camp Road."  To conform with tradition, we played the "Rollin' Free" by Johnny Cash.  It's a perfect song for our style of riding.

Rollin' free Johnny Cash

When we got there, we got a surprise.  The Archery Camp Road, which is notorious for having tons of washouts and great holes, making it one of the most dangerous roads to ride, had been "fixed."  The owner had laid down some gravel over all the bad parts and left a road that could be traveled by a Husky at 80 miles per, without much worry of danger.  Sure, the "gravel" did seem to be absolutely massive 5-inch minus with sharp edges, but the muddy dirt beneath had let the rocks sink and get pounded down until they formed a virtual brick road.

We met up with our fellow riders (uncle Scott and cousin Mark) at the end of the road.  There were no camps available on the road, because it was the meat of Turkey Hunting season.  So, in typical fashion, we carved a new one out of the woods, and made our campfire in this great pit that was sitting there for an unknown reason.  The night was cold, and we struggled to get enough wood to feed the campfire enough to stay warm, but we all stayed up to about 3:00am.

Saturday, 10 April

We woke up at a time.  Who knows what time, but it was one of them double-digit numbers.  Maybe.  We all stood around and bullshitted a bit, before it came time to unload the bikes from the truck.  It was around this time that my other uncle, John, arrived in his old Dodge Caravan with horrendously mediocre Honda MR250 inside.



With the bikes unloaded, the testing ritual began.  Scott had been talking big about how all his Huskies started perfectly.  Dad took the 390CR aside, turned on the gas and choke, and proceeded to wait a few seconds.  A few gentle prods on the ridiculously short shifter got some gas swirling around in the cylinder.  Then, on the first genuine kick, the big open-classer came to life in all its triumph and majesty.  Take that, Scott!

The 250CR was next.  After a few kicks, it too came to life.  But strangely, it died suddenly and without notice and refused to start or even make a pop afterward.  The problem turned out to be the kill-switch, which was taken apart, put back, and gave no more troubles throughout the rest of the day.

Eventually, everyone's bikes were tested, though both of the Huskies (an '81 430XC and '79 250OR for Mark) took more than 15 kicks to fire.  With that, we took off on the ride.  It started easy, with no craziness or banging of gears (for the most part), although there was some occasional... quick shifting taking place.

After about fifteen minutes of riding, I noticed that my 250 was exhibiting some odd power delivery characteristics.  There was nothing major, but it did feel like it was jetted richly or something.  Then, without warning, the engine noise of the thing doubled.  This was significant, considering that the silencer was unpacked to begin with.  I stopped in the road and looked down at the bike, which is when I noticed that the tip of the silencer, with inner screen attached, was no longer bolted to the silencer itself.  It was just hanging there!  I killed the bike, wrapped the oily thing in toilet paper from my backpack and we continued on.  For the rest of the trip, I rode about with what amounts to a straight stinger with a megaphone.



After another fifteen minutes, we stopped at the top of a big windy hill under some powerlines.  As we meandered about, listening to the lines crack and sizzle, I took the opportunity to demonstrate the absurdity of my exhaust, and get a picture of Scott and Dad looking bad-ass.




We soon took off again, but Mark's 250OR refused to start.  Even a run-and-bump failed.  Fortunately, we were on the top of a great mountain, so a few hundred feet of walking, and there was an adequate hill for a compression start.  When the bike fired, rocks and dust went sailing from Mark's rear tire in triumph as the OR blasted toward the horizon.

We soon ran out of gravel roads, and the terrain switched to dirt.  This was a bad thing, because the snow had only recently melted and left much of the roads gooey and covered with mud puddles.  Several times throughout the day, there were near-misses as the bike tried to slide one way or another into a bottomless pit of brown slime.  After some significant miles, we passed The Devil's Tee (so named because for about ten years, there was always someone who broke down before getting there) and headed out to "The Ford."  This insanely rusted 1949 Ford was abandoned in the desert long ago, and been burned, covered with "so-and-so-was-here-on-this-date-with-this-bike" sign-in scratches, as well as the occasional initials written in bullet holes.  Welcome to redneck territory.



The next stop was the fabled "Rock Quarry," where a mining operation had once been set up to carve bright red rainbow rock from the side of a mountain.  On the way past the devil's tee, we bypassed the road entirely by cutting through the field to the left of it.  Little did we know, this section of field was more of a swamp than a field at this time of year, with standing water cleverly hidden by the grass.  With throttle wide open in third gear, the 250s struggled to maintain speed through the mire as tires sank a good 10" into the ooze.  A 125 would likely not have made it, but the torquey 390 seemed comfortable.

After this point, Mark and I ended up behind John, which was a bad sign.  Like James May from Top Gear, Johnson's sense of direction can best be described as sketchy.  After passing the intersection I thought led to the Rock Quarry, we continued for five miles more, not wanting to turn around and let John keep riding all the way to Canada.  Eventually, he stopped, turned around, and led us past the intersection again.  Another five miles past the turn-off, another turn-around was in order, and Johnson once again took the lead.  Annoyed with this navigatory performance, I cut off the road, through a field of grass and boulders, and led the proper way to the intersection.  Mark and I then waited for five minutes for John to catch up.

When we arrived at the Rock Quarry, I noted something else strange about my bike.  The shocks suddenly seemed to have no dampening, as though they were just a set of springs and nothing else.  When the bike was stopped, the cause was obvious.  One of the O-Rings in one of the shocks and blown, and spewed oil over everything, leaving that side of the bike undamped, and the whole bike unbalanced and springy.  Dammit.


(^^ From left to right, we have me (with sun in my eyes) and my '82 250CR, dad's '79 390CR, Mark with his '79 250OR, and Scott's '81 430XC.  Blue, by the way, is possibly the single least common gas tank color for Husqvarnas.  How in the hell did that happen?)

After exploring around the quarry for a while, ratchet-jawing about the good ole days when the place was actually a functioning quarry, we took off for camp.  The suspension on the Husky was horrific.  Over every rock and bump, the rear wheel would grab huge amounts of air, spin in futility, then tap the ground briefly again before surging back into the air.  Grip over rocks was minimal.  Eventually, though, rocks gave way to a fast gravel road where we got to cruise along comfortably at 60mph in sixth, down a hill with the throttle barely cracked.  Ah, mileage.



The next stage was risky.  We'd ventured so far from the way we'd come, that we really didn't want to go back all that way.  Besides, we'd already ridden all of it!  So, we gathered up some balls and hit the pavement, keeping the bikes at a comfortable middle-of-the-road RPM in sixth.  This was a virtually abandoned little road, but afterward, we had to spend about a minute on the highway, and then another five on the road leading to camp, the way we'd driven in the night before.

Trying to keep low-key with the almighty bazooka-exhausted Husky of death riding on the world's most oingy-boingy shocks, I happened to let Mark pass on an uphill section after a 90-degree turn.  That just wasn't going to do!  So, I rolled on the power in fourth, letting the RPM build until the 250 went into a great shrieking wail of horsepower and doom, at which point I clicked fifth, then sixth as I sailed by Mark doing 85.  The sound of that fly-by must've been Biblical.

About five minutes later, we arrived back at camp.  Scott revealled that half-way through the return trip, his clutch had completely shat itself and gone from working perfectly, to scarcely working at all.  Almost any application of throttle would make it slip relentlessly.

After everyone had a chance to rest a while, not one, but TWO chainsaws were fired up, and we went into the woods to do what Oregonians do best.  Cut down trees!  Don't worry, we only cut the dead ones, which actually provides a service to the live ones who need sunlight.  After half an hour with two men cutting and three carrying 4-foot logs two-at-a-time to the wood pile, we were done, with well over half a ton of timber.



Unlike the night before, Saturday night's fire was a beast.  When sitting around it, it was recommended to keep the chairs at least ten feet away at all times, or else the heat would become unbearable.  We did an experiment, and found that if you took a long stick and held one end of it in the air at the bottom of the fire, it would take seven seconds for it to catch on fire.  Just from the heat in the air.


(This fire stood about 5-6 feet high, from ash pit to flame top.)

Sunday, 11 April

The next morning, we got up and realized that three remarkable things had happened.  First, almost all the wood we'd harvested was gone, and there was nothing but fine ash and a resilient piece of steel remaining.



Remarkable thing number two was that my dad's beloved Sony Cybershot camera was missing.  After a search all around camp, Mark decided to poke through the fire ashes with a stick, and found the metal backing to the camera, with a little hole where the viewfinder once was.  And nothing else.  All the rest of the camera was incinerated and vanished into the ether.

Remarkable thing number three, was that one of the nuts that holds the rear axle on my bike was missing!  So on the way back on that last ride, in addition to having the most-pitiful suspension on Earth, I had been dealing with a rear wheel threatening at any moment to detach itself from the motorcycle.  Not quite able to wiggle itself free, it had made sport of wobbling about and making me thing the suspension was even worse than it actually was.  Dammit!

With all this, as well as Scott's decimated clutch, we really didn't make any attempt at another ride, even though the weather was fairly warm.  At about 6:45, we were all packed up and headed home.


29
General Two Stroke Talk / Spring Ride of 2009
« on: March 22, 2010, 11:55:41 PM »
Seeing as the "Spring Ride" of 2010, which is the official name for the first ride of the season, is approaching, I thought it would be a good time to bring up my old ride report of last year's Spring Ride.  It's a bit of a long read, but it shows the sort of riding we do, and there's pictures included!

http://www.mxsimulator.com/benchracing3/viewtopic.php?f=5&t=2069

30
General Two Stroke Talk / They should make MX four-strokes like THIS!
« on: March 22, 2010, 02:54:55 PM »
Normally, a four-stroke engine is a bit of a turd.  That's pretty-well agreed here.  However, There have been times in the past when some companies have made four-strokes that are truly insane.  Why have we never seen a turbocharged dirt-bike?  Sure, it's not allowed in official competition, but I think it would still sell on the novelty value.

Group B Rally Cars Sound (1983-1986)

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