What wheels are they? Look similar to the ones I've got on my Mini

The main issue is getting at it to drift it out. The frame rail is in the way unfortunately

Should push out from the other side. I had this problem and in the end resorted to cutting it out and buying a used relay arm.
The bearings were rusted solid on mine

What's the spark plug look like? Have you checked/cleaned the air filter? Is the exhaust blowing?

Did you rejet or adjust the carb to suit the big bore kit?

@BlueMoto yes I've got one on mine. Works a treat - bit of wiring to do and I made a mounting plate as the one you get with it is a bit naff.

Not a huge job though

@NINJA maybe you just didn't use them right worked a treat for me

@NINJA do you have any experience to back up your broad sweeping statement?

@britshgigolo let's hope so