350x with reverse? 250x tranny or full bottom end?

[TheRealFatShady]

Has anyone made a 350X with reverse?

I was thinking of using the full 350X top end if the stroke is the same/wrist pin location matches. Or swap the crank/rod from the 350x into a 250x bottom end.

Or just use the tranny from the 250x and put it into the 350x cases.

Haven't torn apart either engine, but would love to do this.

[atc350xer]

alot of people have bolted a 300ex motor into a 350x... 5 speeds, plus reverse and electric start

[SWIGIN]

Anyone ever hear of the TC racing 6 speed 250x motor? It was basicly a 350x tranny installed into 250x cases.

I don't see why you couldn't do the opposit but you will lose 6th. There is some machining involved but it's not so bad.

[Dirtcrasher]

Seems like a hopped up 300EX would be the easiest to do.......

Reverse and ES would be sweet. I'd hate the 10 lbs a batter and starter would add though :(

[Rainer]

Never heard of one I'm pretty sure the 250sx is a shaft drive so I don't know how that setup would work out

[Dirtcrasher]

Who said "SX", I think they were referring to the 250X.....

[TheRealFatShady]

Yep, just picked up a 250x and 350x engine, not sure why the 250 was apart, but the 350 supposedly dropped a valve and hit piston? Will need to disassemble to check.

But I am picking up a 300ex engine to use for parts for my 300 Big Red gear reduction, maybe will get the extra bottom end. Maybe I can just use that

[gary.h]

Dude, a pumped 300ex on a a trike sounds awesome............=

[Eric250R]

The 300EX swap is very easy. The engine pretty much drops in, the only thing you really have to do is weld a battery cage to the frame. I dropped a 250X engine in my old 350X and it so simple you can almost do it in your sleep.

[Rainer]

My bad I don't know why I was thinking sx the whole time yeah 250x could work