1989 cr 250r cylinder conversion on a 1989 trx 250r bottom end

[jboz5786]

I have one that im trying to figure a few things out on and im wondering if its worth it to leave it on or not? Does anyone else done this? Thanks

[voodoochassis]

check out www.ftzracing.com they do both conversions..

[Honda 250r 001]

im pretty sure it makes good power. but not like an aftermarket cylinder.

[jboz5786]

Im wondering what they do to the power valves in the cylinder and what kind of spacer plate id have to run. I know id need a 4mm stroker crank with a long rod

[Honda 250r 001]

stroker cranks are only made with the long rod, and you unhook the powervalves or weld them open.

[jboz5786]

Ok Ill have to see what size the crank and the rods are on this beast then. Ill look to see if there welded or not. I don't have a great deal of knowledge on this conversion so bare with me. Anyone know what the spacer plate size should be? I have a 0.190 thick spacer plate that came with the motor Im wondering if thats the size I need or not?

[jboz5786]

I just took the covers off my power valves and Im not seeing the power valves there anymore? on each side on the top there is a bolt on each side holding a circle looking thing onto the cylinder and thats all I see. That and a bunch of holes where something use to be on each side:confused:

[Honda 250r 001]

for the spacer size your going to have to set the cylinder on there and see how the pisotn matches the top of the cylinder.

[jboz5786]

Yeah i forgot to try that thanks

[LONG-ROD]

weld it open, not shut..

[Honda 250r 001]

haha yes. sorry bout that.

[jboz5786]

Im not seeing anything welded just a bunch of stuff missing.