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Cr 500 Engine

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Is the CR500 motor the same specs as a Cr250 besides the bore and stroke. And could I just resleve a 250 to make it a 500.

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no, the cr500 is not a powervalve motor and the piston is about twicw the size of a 250

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If you were able to somehow adapt a 500 jug and head to a 250 bottom end, the bottom end isn't engineered to handle the flow or the stress. So, if you were able to get it to crank, the bottom end would destroy itself.

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Is the CR500 motor the same specs as a Cr250

No.... too short of a comment maybe, but, accurate.. no

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They aren't remotely similar, but if you can ride fast enough to need more than the 250 has you can probably get your factory mechanic to shoe-horn a 500 into the 250 frame, then you'd realize it only has 5-10 more hp, doesn't rev out very well, vibrates like crazy and has massive amounts of rotational inertia, upon which time you can tell your mechanic to put it back the way it was meant to be:)

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They aren't remotely similar, but if you can ride fast enough to need more than the 250 has you can probably get your factory mechanic to shoe-horn a 500 into the 250 frame, then you'd realize it only has 5-10 more hp, doesn't rev out very well, vibrates like crazy and has massive amounts of rotational inertia, upon which time you can tell your mechanic to put it back the way it was meant to be:)

Wow what kinda 500 you ridin?!

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They aren't remotely similar, but if you can ride fast enough to need more than the 250 has you can probably get your factory mechanic to shoe-horn a 500 into the 250 frame, then you'd realize it only has 5-10 more hp, doesn't rev out very well, vibrates like crazy and has massive amounts of rotational inertia, upon which time you can tell your mechanic to put it back the way it was meant to be:)

That's really misleading when you compare the peak hp like that.

Compare the two motors at, say, 5,000 rpm and then get back to us on what the hp difference is. Why rev out when the power is in the midrange? Also, the rotational inertia is partly what makes KX500s and CR500s great in the desert.

Back to the original question, there is an ATV tuner on the west coast who converts 250s to 500s and claims to dyno them at nearly double what a stock CR500 does.

It’s the new Mac Racing, Inc TRX500R. The Mac Racing TRX500R is a TRX250R based engine that has been reworked to use a CR500 cylinder. The first generation of the 500R is a monster, and currently Mac Racing is beginning on incorporating the improvements discovered during relentless R&D to create the second generation of 500R’s. Can we say alcohol boys and girls???

http://www.atvsource.com/articles/product_reviews/2002/011602_mac_racing.htm

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That's really misleading when you compare the peak hp like that.

Compare the two motors at, say, 5,000 rpm and then get back to us on what the hp difference is. Why rev out when the power is in the midrange? Also, the rotational inertia is partly what makes KX500s and CR500s great in the desert.

Back to the original question, there is an ATV tuner on the west coast who converts 250s to 500s and claims to dyno them at nearly double what a stock CR500 does.

Even on Alky they aren't going to be pulling 110-115 rear wheel horsepower - that would be double a CR500's hp.

Sorta surprised they are using a quad bottom end instead of a CR250 bottom end or something of that nature - although the backward kicking and diff design of the cases does come into play. Big stroke on the crank to get a 250cc engine out to 500cc too. I bet that was fun. If you just bolt a 500cc jug on a 250 bottom end (not possible) it wouldn't be 500cc... you'd have to figure the bore -vs- stroke to see what the new size engine would be.

MP

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