crf150

[2010 kx250f]

ok, so me and my buddy was talking and some one told him to put a crf230 top end on a crf150..when i say top end i mean the new cylender, piston and rings, and gasketss...if this crazzy idea would work what all would we have to have to make it run??

[400x]

I'm curious about this because I'm sure you can pick up a fairly decent 230 motor for cheap so if you can just swap the top end of the 230 to the 150 with out the need of swapping cranks it seems like it would be a very simple way to make some decent extra power. So to me this seems like it would be more worth it to do than just put a BBR big bore kit in it.

[racejmac]

you need to put the crank and rod in the lower case to make it work...

The 230 and the 150 share the same bolt pattern and head... The crank assembly is longer on the 230...

Must be cold and you all are watching too much olympics on tv...

go outside and play... LOL

[2010 kx250f]

yeah, its way to cold lol..well it was fun while it last..what are some cheaper mods that will make the most differenct???

[400x]

But if you could find a 230 motor for cheap could you just swap the crank and top end over and have a 230, or just swap top ends for a cheaper big bore kit?

Edited February 16, 2010 by 400x
Epic Faild at life

[racejmac]

bore is too big for the 150.... that's why you have to change the stroke...

As for the cheap 230 motor idea... if ya find one... just bolt it in... be sure to use the motor mounts for the 230... 150 mounts are different...

[400x]

Oh ok, I wasn't sure if the stroke was to big for the littler 150 or not. I thought I was told before you could do it but I guess not. Thanks for all the help.

[Toby_S]

bore is too big for the 150.... that's why you have to change the stroke...

As for the cheap 230 motor idea... if ya find one... just bolt it in... be sure to use the motor mounts for the 230... 150 mounts are different...

Do you need all the mounts (plates) or just the top ones(hanger plates). I'm putting an XR200 in a 150, and the lower front mounts look good, but the tops are too long. I ordered 230 top mounts to put the 200 engine in the 150 frame.

Mounts are cheap, by the way.

Toby

[4strokeridertt]

If you have a 2006 or later electric start CRF150F you can buy a 225 piston (big bore kit) from Engines Only. It bolts on and you don't even need to take the motor out of the frame.

[Torqd]

Toby... I just used the 150 brackets and redrilled them... I have a 150 based motor with 230 crank and top end on it... works fine... they really don't do a whole lot anyway... Good Luck

[400x]

Torqd hows the performance of the 150 motor with the 230 crank and top end?

[Torqd]

They work great... They are not stock though...one has a BBR 240 kit as well as custom head work, Mike Coe cam, lightened flywheel, big carb, pipe etc... The other has a bigger custom kit yet. They will yank your arms out of socket. I have worked with Mike Coe on many projects and he can tell you this is a killer setup. There are a few others around hear making silly HP as well and they too work with Mike. One thing to think about is all the little parts it takes to do the conversion... like cam chain, cam chain guides, tension guides, cyl studs, cyl, piston of choice, bigger carb, bracket mods, etc. Then while you are at it might as well get the big bore kit of Mikes and a cam... all or nothing for me:-) And I love it. I have pulled a few 150r's and I can tell you they don't like it;-)

[400x]

Yeah that what me and my friend were talking about. As long as we would already be working on the bike we said we might as well throw a 240 kit in it or something. Did you use the stock 230 carb and just re jet it or did you go aftermarket with it?

[Torqd]

A stocker would do for most builds but I went with xr250 carb... I think I might still have an extra one somewhere....

[400x]

This thread is wanting to make me write checks my wallet can't cash. haha

[airmaxx23]

I just sent my 150 engine to Mike to get it built into a 230. Should have it back in a couple weeks.

[400x]

What kind of goodies are going in it?

[airmaxx23]

What kind of goodies are going in it?

All stock OEM Honda 230 parts.

[400x]

Oh let me know how the performance is of stock 230 engine parts.

[airmaxx23]

Oh let me know how the performance is of stock 230 engine parts.

I plan on doing a little "review" once I get it back and get a chance to try it out.