Have some issues I'd love some help with. The bike runs perfect for the first 5 mins of the day... then when it's warmed up it starts backfiring/misfiring. The exhaust note also changes - sounds like it's dropping a cylinder.
Carbs were overhauled a couple of months ago.
I've pulled the plugs and the number 2 cylinder was wet with fuel... I'm guessing it isn't getting good enough spark.
I've tested the pickup coil, HT coil for 2nd cylinder, HT lead, Stator and regulator/rectifier. Pickup coil, HT coil and HT lead were within specs.
Stator had slightly high resistance - about 0.6ohms on all readings - workshop manual says 0.48 max. Pretty close but a little high. No short to earth though which is good.
R/R seems to be faulty - getting infinite resistance across all diodes?
Bike also is charging at the battery at only 12.9v at all rev ranges. Obviously this is too low.
So..... my questions.... if the R/R is faulty as it seems, could this cause low charge at the battery? I've never had any problem with overcharging, blown fuses/globes etc.
Also... if the R/R does indeed cause my low charge problem, could this be the cause of my problems with backfire/misfiring/dropping a cylinder?
I'm confused because I don't see how this would only happen when hot, and only seem to affect no. 2 cylinder?
Maybe I am missing something.
Expert advice appreciated!
Sorry for the long post :)