Transplant for my CB250RS

**Nzpure** · 7th January 2012, 18:41

I have heard that a xl/xr 500 single is the easiest to transplant that will still look original. Do you guys know of any others that are realitivly easy to do? Must be a single, has to be cheap. I'm staying with singles as i want it to be able to pass as a relativly standard 250

**FJRider** · 7th January 2012, 19:20

And when the WOF "guy" checks the engine numbers ... ???

**dogsnbikes** · 7th January 2012, 19:34

Depends on how far you want to go??

I have a GB 500 motor which I am fitting into a CB250rs which will take some mods

It lines up with the rear mounts ok, but needs spacers made up for the rear and will need to make new plates for the front and top mounts once thats all sorted,I need to shift the tank mounts on the frame to lift the tank of the motor and change the rear tank mount and widen the frame,so I can fitcarb in, then build and fit an oil tank for the GB motor....

Another option I did consider and fitted rather well,was keeping the 250RS bottom end changing the top gearbox casing for a 500 to fit the 500 barrel and head,but will need things beefed up.....

I haven't updated the blog on here for a while as I have been rebuilding a bike for the Mrs

**DMNTD:Me** · 7th January 2012, 19:50

Originally Posted by FJRider

And when the WOF "guy" checks the engine numbers ... ???

Never seen one check engine numbers...VIN/chassis, yes

**nzspokes** · 7th January 2012, 21:18

Ive thought about this for my CBX, have heard you can go 350 with a yamaha piston etc.

**neels** · 7th January 2012, 21:31

Is it broken?

Otherwise why bother, all you'll end up with is an imitation of an FT500, and they were shit anyway.

**nzspokes** · 7th January 2012, 21:38

Originally Posted by neels

Is it broken?

Otherwise why bother, all you'll end up with is an imitation of an FT500, and they were shit anyway.

Which is why I havent bothered on mine. End up putting to much money into it. But mine goes well anyway but I think the CB250 motor has a whole lot less HP than mine.

**Nzpure** · 7th January 2012, 21:45

Originally Posted by neels

Is it broken?

Otherwise why bother, all you'll end up with is an imitation of an FT500, and they were shit anyway.

Im making a cafe racer just tossing up idea's for the motor as its guttless even by 250 standards.
Nah its not broken but why let that stop me =P
Why the hell would the wof guy check the engine number?

**nzspokes** · 7th January 2012, 21:52

Originally Posted by Nzpure

Im making a cafe racer just tossing up idea's for the motor as its guttless even by 250 standards.

Get a GB250 motor then, should go straight in. Heaps more go.

**ducatilover** · 7th January 2012, 22:49

Originally Posted by DMNTD

Never seen one check engine numbers...VIN/chassis, yes

This.

I may or may not have had one or fifty million motors that are bigger than the original and I never had a problem.

XR650 lump will get in the CB if you're really, really keen.

**DrunkenMistake** · 7th January 2012, 23:40

Originally Posted by ducatilover

This.

I may or may not have had one or fifty million motors that are bigger than the original and I never had a problem.

XR650 lump will get in the CB if you're really, really keen.

Get yourself a GSXR600 motor and shoe horn that shit in,
Would make an epic sleeper...
Just remember to wear shorts.

**ducatilover** · 7th January 2012, 23:43

Originally Posted by DrunkenMistake

Get yourself a GSXR600 motor and shoe horn that shit in,
Would make an epic sleeper...
Just remember to wear shorts.

Sorry, I didn't hear you, was putting my jandals on.

**ktm84mxc** · 8th January 2012, 07:47

Anything can be made to fit if you have the desire & patience.
The biggest I thought you could take a 250 RFVC {CBX,XR} single to was 280cc as the engines are over square, try fitting the Hot up parts like cam, piston, exhaust etc from White bros, XR only's, Yoshi.
Those little XR's can be made to scream if you chuck enough money at them. A CBX is just a retuned XR for the street.