January 9, 201511 yr Hi ,so I got these 2 sets of frames 403s and want a twin shock , I got gas gas forks getting yolks,how do I know what bearings to buy,also ,do I need new spindles ? this is a bigger job than I thought , and there are no fantic manuals, how do others know how parts fit,the engine is no probs fit straight in.i suppose reading and looking at forums is the way forward,on I read,thanks, Jon
January 9, 201511 yr Don't think any manual would give info on interchangeability. Re steering bearings, unless someone has done this before and has noted sizes, you will have to measure and consult bearing catalogues. No saying what you want exists unfortunately. Then you have to get creative, or pay someone to do some/all of the job.
January 9, 201511 yr Author It's hard learning, it is a good hobby tho, I been all over web fantic doesn't give much out do they , thanks for advice,Jon
January 9, 201511 yr Author They both have same frame numbers mono and twin ,fm *3400xxxx* so most bits fit I think exhaust will be modified that's weeks away tho classic trials is a good info know of any other sites? ,thanks jon
January 9, 201511 yr Right... listen carefully.... Use the 300 frame and swinging arm that you have. Before you put anything together strip the swinging arm bearings are grease/replace. You will need to buy some rear shocks. I recommend BETOR or better. Use the complete front end from the 301 including the headstock bearings. You may need to make up a spacer as the 301 headstock is slightly longer than the 300 and may not tighten up. Use your 301 rear wheel but you will need to get a 300 rear brake plate to make it fit. I think spindle is same. Use your 301 engine & carb. Should be a straight fit. Not sure if the sump plate will fit or not but probably can be made to fit. You will need for a 300 - an exhaust, airbox, tank, seat, rear mud guard, brake pedal & rod. See Richard Allen for parts. Helpful but expensive. exhaust £100 airbox £100 tank £50 seat £100 rear mud guard £30 brake pedal & rod £40 You should then have an arguably reasonably twinshock that is capably of winning trials. There are MANY tweaks that you can still do but that should get you started.
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