cr250 jug

[EAT_A_450]

Anyone running a 85' cr250 jug on their 250R. What is the difference? I read some where that it will give you lots more power.

[ONLY2STROKES]

it can be done.it takes some machining of the cases to get it to work.i am not real familiar with the setup but they can run hard.the newer models have the sub/triple exhaust ports.they have alot of exhaust area which helps a great deal.i do know someone who is real familiar with this setup.ill try to contact him for you if you wish.

[EAT_A_450]

sure- if you don't mind. I just want to know what all has to be done and if there would be a big difference. I thought that that an 84' and 85' would bolt right on.

[ONLY2STROKES]

well i am not sure if any years will bolt on without modifying anything.but there is more power to be had with the newer cr jugs.ill try to get you a phone number or an email addy.

[FPMXer]

Bolting a CR jug on an R can be done. Your issue is how are you going to operate the powervalve or just block it off. If you block it off then why change the cylinder.

[ONLY2STROKES]

Originally Posted by FPMXer

Bolting a CR jug on an R can be done. Your issue is how are you going to operate the powervalve or just block it off. If you block it off then why change the cylinder.

better port layout and more exhaust area=more HP.

[bushwesl]

The reason for putting a CR cylinder on a TRX bottom end is because the CR cylinder has a better port layout. And yes, some years are a direct bolt on for the TRX bottom end, but which ones I can't remember. The PV on the CR is a mechanical operating PV and will not work on the TRX bottom end without serious modifications. I read a post somewhere of someone getting one to actually work on an ATC, but he had spent A LOT of time and money to make it work.

IMO, you are much better off buying a Pro-X cylinder and having a reputable builder port it. It will definitely be the biggest bang for your buck. Switching over to a CR cylinder is not worth the hassle because you're really not going to gain much from it. If you were to remove a stock unported TRX cylinder and slap a stock unported CR cylinder on you're probably going to make more power, yes, but is it worth it?? No. Especially when you can get used Pro-X cylinders these days for a decent price.