hi can anyone out there help
my c15 starts first or second kick cold .but as it warms up .it runs rich black smoke
and barely idles ive lowered the needle to max
im running points still ..there ok .charging ok 7.5 volts
after recent rebuild resto .
any clues guys . maybe jet sizes that i could check!
thanx ian
If you bike is the home market C15 Star and not an SS80 or competition model then it should be fitted with a type 375 monobloc with 7/8 inch bore.
If it is an original carb and not modern production it is probably marked 375/34 on the mounting flange.
It shold be fitted with ;
140 main jet
105 needle jet
25 pilot jet
4 throttle valve
Needle fitted in position 3.
The needle jet could be worn or someone may have fitted the more common 106 size.
Or the carb could be wrongly assembled
Check the joint between the float needle seating and carb body.
If the carb has a recess as the photo then there should be fibre washer between body and seating.
If the body is flat no recess then the joint should be metal to metal. Sometime a fibre washer is wrongly fitted in this joint. It raises the float level and can cause flooding and rich running.