classic motorcycle forum

hi guys, this engine overhaul is still giving me loads of problems.i have began work on the clutch and having got the new cluth spring nuts I,ve found that they are fractionately smaller than than the studs on mine.it is clear that the clutch has been changed at some time as this is nothing like the c15 clutch seen in all the manuals etc. my chainwheel  has 40-3204 stamped on the back of it,and although it is still a 4 plate and  fits on the shaft/keyway o.k however there is a wobble/play so probably needs needs new rollers but I hav,nt a clue how to strip it  down any further.  I thought about re tapping the studs to fit my spring nuts but can,t get at them.i know its a long shot but if anyone recognises the number stamped on the back of it or knows what this clutch maybe off,then maybe I can progress further.any help would be appreciated,kind regards, steve.

hi guys,thanks for all the help in the past,i have a question re the central clutch nut.(the one you need a puller to get off).i am at the stage of refitting now and looking at all the books available it shows a tab washer.but mine just has a thick washer and the nut seems to just fit inside this before tightening.is this correct or am I missing something?

hi there no wonder i can,t get my c15 started i think i,ve got a serious electrical problem i hope someone can advise me differently, so here goes. i thought i,d got a spark at the plug (well i did have but it didn,t last) i have just charged my battery up before trying it on the bike, with a 6v tester accross the battery termnals its fine but when i turn the ignition switch to either on or emergency start position (new switch  and i,ve tried the old one as well ) the tester light goes  really dim and the c.b lead( black and white) is only sometimes  live and when you open the points by hand you get a spark when the spark plug is earthed to the engine then it just disappears until you disconnect everything and start all over,then you get a spark for a little while. only the battery power has all but diminished now.i have tried two coils , &  two dizzies. i thought maybe the wiring harness was shot but took it off the bike and tested it on the bench putting a tester to each end of the wires and all seems fine except the small rectifier post was only live some times (i,ve wire brushed it all of and now that seems good as well. the only other thing i,m not sure about is the three wires out of the alternator as they  could be connected incorectly but would this really make a big difference,as i thought they were for charging and lighting only. any advise would be helpful,thanks folks

anyone out there any ideas to help me . my c15  engine has been stripped (valve timing was out-- now corrected) i have fitted new valve guides and reground the valves. its now back in the bike and i am at my wits end why it wont start. there is good compression(ihave used a compression tester) i have a good spark,and i am sure the ignition timing is correct.(i have checked it that many times i am still doing it in my sleep)the only thing i,m not sure of is the carb (i only have one cable which is the throttle cable, the other hole has a spring loadedpush down bar / bolt( it doesn,t look like its got a choke to me)it is spitting at times but  justwill not go. it has been dated by the b.s.a. club as 1965.any comments would be appreciated. oh there is a fault on the engine where the dizzy fits in not a crack but looks like its been damaged.

can anyone help please? i am working on my first renovation product a 1965 c15 and am nearly ready to give up. i have fitted new valve guides and have good compression ,i have changed the dizzy & coil and have a good spark at the plug . i believe the timing is correct as i have done it that many times but it still won.t start. all it does is backfire into the air filter. any ideas would  help my other problem is actually kicking it over.  with the plug out it is easy but with the plug in the kickstart seems to just slip without the engine turning. any help will be really appreciated,i thought this was going to be a nice retirement project but it has become a real windup.

can anyone help me i bought a 1965 c15 for my first project couldn,t get it started due to timing being out, [it was backfiring] it is a replaicement dizzy,[came with all the other bits] i,ve got the head off,and am trying to time it correctly before trying again .points are opening and closing o.k [with test light] but can;t fathom out when the spark should come is it just before the piston is at t.d.c. i,ve read and read rupert ratio,s book but my points seem to open at a different time each time i turn the engine over.is the dizzy naff? [its not the origional one] or does anyone know an easy way to time it. thanks.