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Offline riffraff

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big, bigger, biggest
« on: July 05, 2012, 07:15:56 AM »
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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aaahhhhh yes, I remember the good old days

Offline factoryX

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« Reply #1 on: July 05, 2012, 09:36:21 AM »
Well with improved porting.. ???
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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I ride an 03 yz250, wait 04, wait 05, what ever, they're all the same #$@% YOU!

Offline Jeram

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« Reply #2 on: July 05, 2012, 11:13:22 AM »
yeah, they make around 100 rwhp

the cylinders are actually made by these guys who cast alot of big-big bore cylinders for various bikes
http://www.cpindinc.com/
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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« Reply #3 on: July 05, 2012, 01:09:56 PM »
100 horsepower? Theres TRUCKS that don't make those kind of ponies... Small trucks granted but still classified as a truck.

That much horsepower isn't usable on a motocross track thats for sure, but enduro might be a different deal entirely. A 7 speed WR tranny powered by that 640 engine would be a real touring machine. And of course a four stroke eater
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline SachsGS

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« Reply #4 on: July 05, 2012, 02:43:16 PM »
Must be fun kickstarting one of those things.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline factoryX

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« Reply #5 on: July 05, 2012, 05:06:40 PM »
Actually, with that broad of hp range, its very usable.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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I ride an 03 yz250, wait 04, wait 05, what ever, they're all the same #$@% YOU!

Offline Jeram

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« Reply #6 on: July 06, 2012, 02:05:27 AM »
youtube worlds fastest CR500 and you will see what these cylinders are for.

that, hill climbing, sand duning and maybe flat track and perhaps road racing would be the only real uses
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline nom de guerre

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« Reply #7 on: July 06, 2012, 02:30:49 AM »
That is a big piston for road racing IMO Jeram, when ATK tried the 685 in SM, it just didn't rev and work all that well. I would love to hill climb it though!!! I rode a Maico 620 and it was fast for sure...
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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« Reply #8 on: July 06, 2012, 02:43:34 AM »
Quote from: SachsGS on July 05, 2012, 09:43:16 PM
Must be fun kickstarting one of those things.

I was thinking the same thing haha. My 250 can be difficult but a 640? I think an electric start is in order :P
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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« Reply #9 on: July 06, 2012, 02:54:54 AM »
Imagine the look of pain when the compression kicks you back if your foot slips off the lever...  :P
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Jeram

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« Reply #10 on: July 06, 2012, 03:18:39 AM »
Quote from: nom de guerre on July 06, 2012, 09:30:49 AM
That is a big piston for road racing IMO Jeram, when ATK tried the 685 in SM, it just didn't rev and work all that well. I would love to hill climb it though!!! I rode a Maico 620 and it was fast for sure...

this cylinder is no slouch in a straight line, regardless of piston size.

10 second quarter miles puts 600cc sportsbikes to shame

« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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« Reply #11 on: July 06, 2012, 03:33:04 AM »
Quote from: Jeram on July 06, 2012, 10:18:39 AM
Quote from: nom de guerre on July 06, 2012, 09:30:49 AM
That is a big piston for road racing IMO Jeram, when ATK tried the 685 in SM, it just didn't rev and work all that well. I would love to hill climb it though!!! I rode a Maico 620 and it was fast for sure...

this cylinder is no slouch in a straight line, regardless of piston size.

10 second quarter miles puts 600cc sportsbikes to shame



HAH! Destroyed... Thats damned awesome. four joke sports bikes... ppfft
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline bearorso

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« Reply #12 on: July 06, 2012, 12:31:53 PM »
I'm considering a stroker crank for my 500, when it comes the time for a bottom end job (really, now might be a good idea........)

By just being a bit 'blind', and not looking for the cheaper options, when comparing the cost of an OEM crank assembly, RPMs stroker crank is not that pricey, with our dollars exchange rate - so, I can 'fool' myself into thinking it's a reasonable expense.

Not to have a fire breather - indeed, my goal is to make my 500 even more of a big pussycat - grunty, and smoother revving. In my riding, I don't get near high revs (and I mean high revs for a 500 - not anything else) I'd adjust ports only to achieve that, and, hopefully will have sourced a wide ratio gearbox to put in, whilst doing the rebuild.

Case machining / reinforcement, is no problem. I could probably do a stroker myself / in combination with local specialists, but RPM have a good rep, (though I'm a bit ????? about the Prox Rod kit used) and the projected price is not too bad - my time is valuable, to me, and sometimes, I'd rather use it to make money.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Jeram

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« Reply #13 on: July 06, 2012, 03:57:20 PM »
Although a stroker kit sounds wonderful have you tried to acheive what your after without spending money on a stroker kit.

low ports, longer pipe, alter the head, etc.

Should be able to turn it into 500cc of stump pulling tractor torque.

be extra stroke will help even more-so!

« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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