I was just sitting here thinking about the new Z400, and the nicasil coating on the cylinder, and I was wondering if you could possibly put a new CR250 cylinder and piston on a TRX bottom end. If you could, that would be a really wise investment. The CR is coated just like the Z400's, so you would never have to have your engine bored, and all you would have to buy was a new piston. Plus, the newer CR engines have an electronic powervalve.

Has anyone else thought about it? Think it would work? I want some tech. stuff here, not just the Arkansas type "Yeah, I believe you could weld that dern thing on there" kind of stuff. Thanks

 

Why bother with a puny 250 when you can put a CR500 cylinder on it!! I thought about this when my friend came up the other day on his CR250, but figured if I posted people would just say I am dumb for thinking it, like they did when I asked about the 500/250R conversion. But yea, I am sure you can weld them thing-a-ma-bobs together cletus, go tell your son/brother to come in for suppa! Sorry. check out Mac Racing for info on the 500/250R conversion. I think (forums wouldn't let me say so...) did a review on it, not positive though.

 

ltracerx, the reason the 500 sucks is because of the vibration. There have been many questions on this forum about the 500 conversion, and even with rubber coated motor mounts, the 500cc piston will shake your arms off. I was pondering the 250 because.. well, you get it.

 

Are you talking about the whole motor or just the 500 top end on the R bottom end? I wasn't aware it would vibrate that bad with the counter balancer. Well this isn't any real Tech answer but It could be done, if someone can put a Polaris 400 topend on a R bottom end, I think a CR top-end would be possible to do.

 

The CR 500 motor DOES NOT have a counter balancer. The CR 500 cylinder WILL NOT fit on a TRX 250R bottom. As for putting a CR 250 Cylinder on a TRX 250R bottom, it will not work either.

 

Surethingintown a CR 500 cyl may not fit without mods but it has been done by MAC Racing. So anything can be done with lots of time and money.

 

Thanks for shooting me down Corey [img]i/expressions/face-icon-small-smile.gif[/img]

Would it be possible to have a pre-96 cylinder nicasil coated? So you wouldn't ever have to have it bored? That would be pretty sweet if you could get a 250R motor coated at 265. I might've dreamed it, but I thought I saw an ad in Dirt Wheels about it.

 

Mac racing has put a CR500 cylinder on the R bottom end!! check out there site if you don't believe me. And I already knew the CR500 motor didn't have a counterbalancer.

 

You could buy a hyperdyne cylinder from duncan racing, they are nikasil. They also retro fit CR cylinders to TRX bottom ends but the eliminate the use of the exhaust valve. Others wise you could install an aluminum sleeve and send the cylinder to US Chrome to be nicasiled.

 

my quad now has powervalve and nicasil cylinder... I just gotta put the new engine in...


neways, the easiest cylinder swap is the 250-350 conversion via odyssey top end. They're very much so similar.

as for 250-250, it should be very much so possible, and worth-while.

as for the 500 CYLINDER vibrating more than the 250... LOL! that just made my day! I'll never stop laughing!