trx250r with 350x engine anyone got one??

[Team ATC]

hey guys i got rid of my 450r last fall and been wanting to get something to ride i found a 250r with a 350x motor in it anyone got one? Just looking for some input on them thanks

[deathman53]

they were the hybrid of the 90's and a very popular conversion. 4 wheel action or dirtwheels had a acticle about doing it on a trx250x/300ex, it isn't too good in the trike fantatics mind. Leager used to make a frame to accept a 250x/300ex/350x motor and use 250r for the rest of the bike. If it was done on a stock 250r frame, it had a problem of derailing the chain. The problem lies in placement for the motor, done correctly, the bottom frame rails need to be dropped, so the sprocket lines up w/ the center of the swingarm pivot point. Many didn't do this and the sprocket was too high up.

[RapidRick]

Does anyone remember the exact issue? I've been trying to sell my trx250R and no takers on the left coast and I've got spare 350X engines and have thought about this in the past.

[SWIGIN]

I have a aftermarket chassis 350RX, well at least for now I do. It's getting a YZ426 with a big bore soon....lol

[SWIGIN]

Does anyone remember the exact issue? I've been trying to sell my trx250R and no takers on the left coast and I've got spare 350X engines and have thought about this in the past.

The issue with a stock framed RX is that the motor sat too high and the chain got looser as the swingarm swings up, and the chain flys off when you land. I have seen loads of RX's over the years and I would not even think about owning one with a stock frame. The 350x tears the R frame apart when properly ridden....just my opinion.

[Tyler 54]

The issue with a stock framed RX is that the motor sat too high and the chain got looser as the swingarm swings up, and the chain flys off when you land. I have seen loads of RX's over the years and I would not even think about owning one with a stock frame. The 350x tears the R frame apart when properly ridden....just my opinion.

Maybe you can help. I have a gussetted 87 frame that the lowerframe has been modified and the 350X engine has been lowered in it. It's a full gusset job. Has all custom built motor mounts. Guy I got it from said some guy did them back in the 90's. Said he built 100's of them. You guys got any info?

[dustrunner]

years ago i rode i that was 4 sale, the engine ran great but didnt have enough power for all the extra front end weight. wouldnt even wheelie. im planning on a 660 raptor engine into a tri-z conversion as soon as i get all the parts. good luck.

[SWIGIN]

years ago i rode i that was 4 sale, the engine ran great but didnt have enough power for all the extra front end weight. wouldnt even wheelie. im planning on a 660 raptor engine into a tri-z conversion as soon as i get all the parts. good luck.

That's the other problem with a stock framed RX, they spin like mad and wont carry the front end.

My aftermarket RX is semi hard to keep the front end down when leaving the hole.

[SWIGIN]

Maybe you can help. I have a gussetted 87 frame that the lowerframe has been modified and the 350X engine has been lowered in it. It's a full gusset job. Has all custom built motor mounts. Guy I got it from said some guy did them back in the 90's. Said he built 100's of them. You guys got any info?


Everyone and there brother were building RXs back then so it's hard to say.

[baycitysteve]

140185heres a pic of my buddys 350rx and my ss350x at the pontiac silverdome right befor the amateur supercross that i won ,, hahaha he looped out on a burm and broke a tie rod .. great combo , a good motor builder can make them just about as fast or faster than the new 450's !!

[Tyler 54]

140185heres a pic of my buddys 350rx and my ss350x at the pontiac silverdome right befor the amateur supercross that i won ,, hahaha he looped out on a burm and broke a tie rod .. great combo , a good motor builder can make them just about as fast or faster than the new 450's !!


Dude.. Sweet mullet!!!!!!!

[300rman]

years ago i rode i that was 4 sale, the engine ran great but didnt have enough power for all the extra front end weight. wouldnt even wheelie. im planning on a 660 raptor engine into a tri-z conversion as soon as i get all the parts. good luck.

That will be an interesting project. Having reverse would be sweet.

[baycitysteve]

yea that was along long time ago !! kinda funny looking back !! me and my buddy feel the big companys copied are idea and a few other peoples
idea that 4strokes can be fast and beat two strokes . we always got laughed at when we showed up at a race till we smoked them !!
Dude.. Sweet mullet!!!!!!!

[dustrunner]

ya, thats what i was thinking.. but im a bit concerned about the extra weight...