Author Topic: Engine angle?  (Read 3649 times)

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Offline Likeabigbozz

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Engine angle?
« on: February 19, 2017, 01:51:44 PM »
Hi guys

I'm building a '94 kx250 engine in a '08 crf250 chassis and I have some questions.. so I was hoping you guys can help me...


Does is matter if my engine leans a little bit more forward then it would originally in the kx frame? If I do this everything just fits better. Does the engine would still run good and as long as normal? And how about steering and big jumps. I remember reading about this but that was a while ago. I can also use a eccentric bushing so the weight of the engine is about 2 mm lower and the angle is more like original. Any thoughts?

Is it better to put a teflon(?) Bushing in the motor mounts to reduce vibrations? Or maybe some Tylon?  Because vibrations are not good for the engine right?



I have a perfect '91 casing with a '94 cylinder, gearbox, clutch and ignition. I want to hone/replate the cylinder and buy new powervalve parts for this one or is the '98 cylinder better? And what about the gearbox? I want to build a smooth engine with the best bottom end power possible. I also have a boyesen radvalve. a pwk powerstriker carb and a hgs pipe + muffler. Any ideas?
And what about the filterbox. Should I just use a cr250'00 rubber+filtercage and buy a crf-cr conversion kit on ebay?

Sorry for all the questions but I really want to do the whole engine swap and rebuild thing  as good as possible.

Thanks for your time



Offline 68Fastback

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Re: Engine angle?
« Reply #1 on: February 24, 2017, 08:57:58 AM »
Engine angle is not going to matter as far as how the engine runs. The Engine is never level when riding.  I doubt it would have too much effect on the handling of the bike either,.I ve seen engines with tilted cylinders vertical cylinders and everywhere in between.
2005 CRF250R with 1997 KX500 motor, Talon Hubs, Scott's Stabilizer, IMP Pro Pegs, Acerbis gas tank, folding levers.

Offline RoostiusMaximus

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    • Millar Racing Engines
Re: Engine angle?
« Reply #2 on: February 24, 2017, 10:48:00 AM »
Keep an eye on how the chain draws over the swingarm, I like to have them clocked down in the front if possible.