Two Stroke Motocross
Two Stroke Motocross Forum => General Two Stroke Talk => Topic started by: Two Stroke Todd on November 18, 2010, 09:55:47 AM
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Wow where to start? Well I blew up my bike at the unadilla two sroke challenge back in august and it was pretty ugly. The rod bearing blew apart the rod bent into a p shape and smacked the cylinder and took a chunk out of it everything had damage. Now the good news! Its back together it was less than 600 bucks total for all parts and labor to rebuild. And now its a 265! Holy shit I wish i woukld have built this motor years ago! Worth every penny! Smooth controlled hit, still revs and pulls from bottom to the moon! Anyone considering this i would highly advise you to go for it! Oh and to also avoid HOT ROD CRANK KITS!!!!! Not worth the few bucks you save for the headache they can cause!
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Thanks for the heads up on the Hot Rod crank, will avoid it like the plague, where did ya get the 265 kit from?
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Oh and to also avoid HOT ROD CRANK KITS!!!!!
Yup, common knowledge there :) Hot Rod Connecting Rods flake and break. I always go OEM if possible.
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Sorry to hear that about your bike Todd.... I was so busy at Unadilla that I didn't get to stop by after the race.
It sounds as though your Suzuki is better than ever. I'd love to hear more about what you did to the bike and I'm sure many others on the site feel the same way.
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sounds like the bike is a beast now! Do you have pictures of the bike?
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You have any photos of the rebuild you can share?
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Awesome, glad to hear good followed bad. I like those stories... ;D :D
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John You had enough on your plate at the dilla thanks for your time you gave to talk! As for the bike i had KB5 INDUSTRIES do the build on it. They have a ton of experience with em, and their great to work with. It normally takes between a week and two to turn one around but due to my normally trusty 85 nissan truck also grenading a motor in the same time frame mine was a slower process. I'll try to upload some bike pics. Sorry i dont have any of the actual build itself.
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A couple of pics. I have better ones but they are to large to post. can anyone tell me how to resize them so i can postem?
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wow i suck at computers
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Sick!
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Nice RM, I had a 265 kit that the guy put in my previous RM and it sucked, it had no bottom end, I could not figure out what the deal was, had not bottom end at all, it ran perfect, was jetted perfect, powervalves were right.
Who did your 265 kit, and YEAH I put a hot rod crank in that bike, thru my dad's shop plus getting a extra deal cause we owned shop I rebuilt that bike, hot rod crank, main brg kit, complete gasket kit, Niks Pro x piston for $220 now thats a cheap rebuild!
I would like to do something like that or a 280 kit, just scared it will do what the last bike I had did.
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I thought about doin the 280 as well as a matter of fact i wanted to do it! But gettin pistons turned out to be expensive and difficult. Nobody makes one and to have one or two made was over two hundred bucks a pop. If i could spring for ten or more it was closer to a hundred each. So the 265 was it. As for bottom end i can tell ya this thing rips! I had a normal 450 guy ride it and he's a thumper lover but his first words off of it were. Dude i could ride this! Give kb5 a look. Hell call em up talk to Brad. Tell em i sent ya. Im gonna try to work out a deal for site members with him on the full kits. Bore recoat cylinder porting head mods power valves cut plus all parts for about 800 Total finished done complete. We talked a little today but will talk more early next week.
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Eric Gorr does a 285 or 295 kit for the rm.
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I've used Eric Gorr in the past and would recommend him.
Currently his web site is being updated so you can't get to see very much right now, but hopefully it will be done shortly.
http://www.eric-gorr.com/ (http://www.eric-gorr.com/)
His ideas about big bore kits are worth thinking about. He uses pistons that are readily available, so you don't have to worry about buying expensive or rare custom piston kits. It's a smart way of doing it as Todd and others have found out.
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I've used Eric Gorr in the past and would recommend him.
Currently his web site is being updated so you can't get to see very much right now, but hopefully it will be done shortly.
http://www.eric-gorr.com/ (http://www.eric-gorr.com/)
His ideas about big bore kits are worth thinking about. He uses pistons that are readily available, so you don't have to worry about buying expensive or rare custom piston kits. It's a smart way of doing it as Todd and others have found out.
Take this with a grain of salt since it's he said/he said, however on the kdxrider site several guys have had bad experiences lately with Eric's work. Things like Eric sending them back different engines than they sent it, different cylinders with helicoils installed instead of their clean cylinders etc.
I used to be very active on dirtrider.net (not the magazine) around 10 years ago, and Eric used to post there answering questions and we talked a lot on the site and through email. I always thought Eric seemed like a stand up guy. Sounds like maybe he has gotten a little too busy and had to sacrifice some quality of service to get work out on time. Hopefully those are isolated cases.
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Nice lookin bike! So, my question is this. Do big bores compromise reliability on the 2 strokes like they do on the 4-strokes? I know on say 250F's if you do a lot of motor work or a 290 big bore they become very unreliable and also require a sh*t load more maintenance than a stock bike. Anyone know of anyone good on the West coast that does big bores? Would love to put one in my woods bike once I have a job again!
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two strokes handle big bores fine, if not the same reliability with the stock bore.
http://www.maxrpms.net/shop/index.php/motorcycle-kits/mk-yamaha/yz250.html?SID=nqhchm6jbb2p9u3o1b27rm7ba7 (http://www.maxrpms.net/shop/index.php/motorcycle-kits/mk-yamaha/yz250.html?SID=nqhchm6jbb2p9u3o1b27rm7ba7)
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Here is what i have learned through the process of this build. Only two shops in the U.S. have the 280 pistons for the RM. One is Eric Gorr and the other is Boyeson. I tried to purchase one from boyseson but I was unable to. At the time i was pestering Dag for one I had no idea he had other things on his plate. :( So we called up wossner who makes the pistons for them. These are top quality units! But at 200 plus for one I decided at that point to go with the 265. WHY? Because I was told the 280 is pushin
the limits of the RM cylinder and the the 265 kit was far more reliable. The inner head gasket is the limiting factor on size. I've been told the 265 is very reliable so long as you use a quality crank as in no hot rod rod kit! I went with the pro X rod kit. My motor guy says this is far better than the hot rod rod kit and very affordable compared to stock. Reliability was a major concern for me because I dont like to rebuild bikes more than twice a year. I try to do two top ends every season and a crank every other year this time i came up a few months short on the crank before it went. Again a hot rod kit! :( On the YZs I"m told 285 is the limit with the stock cylinder and head gasket? I hope this helps answer any questions. Tomorrow I'm gonna really try to put a few hours on my new motor! I"ll let you guys know how it goes.