Hello you beautiful bastards,
Rebuilding a CV carb for my 2003 sportster. Ended up having a crack in the casting so got a used one off ebay for parts.
Carb is all back together and starts, idles, accelerates and most important, doesnt leak.
HOWEVER,
Tuning is turning into an issue because I am running very rich, Black smoke during idle, fire when accelerating, but no backfiring.
I have the mixture screw just barely cracked from the seated position, no more room except to seat it, which cuts gas on acceleration.
Here are the specs:
Old carb was set for drag pipes and that stock sportster air filter
Main jet: 180
Slow jet: 42
Stock needle and slide
Since rebuild still running drag pipes but have one of those cute small air cleaners now (all new jets and tubes and gaskets, plus good cleaning:
Main jet: 170 (tried the 180 but was too rich, same problem as above but would stall on acceleration)
Slow jet: 42 (tried a 45 but had to fight it for the 1/4 throttle turn to keep from stalling)
Needle came from a kit that insisted i drill a little bit into the slide as well, still have a stock needle and slide on hand
Accelerates and idles fine but bellows black smoke on idle and fire on acceleration. I have no where left to go with mixture screw to reduce gas flow
Should I put back on stock slide and needle?
Should I go down a size in slow and main jets? if so what do you think? got a slew of main jets, but will have to pick up a slow jet
Rebuilding a CV carb for my 2003 sportster. Ended up having a crack in the casting so got a used one off ebay for parts.
Carb is all back together and starts, idles, accelerates and most important, doesnt leak.
HOWEVER,
Tuning is turning into an issue because I am running very rich, Black smoke during idle, fire when accelerating, but no backfiring.
I have the mixture screw just barely cracked from the seated position, no more room except to seat it, which cuts gas on acceleration.
Here are the specs:
Old carb was set for drag pipes and that stock sportster air filter
Main jet: 180
Slow jet: 42
Stock needle and slide
Since rebuild still running drag pipes but have one of those cute small air cleaners now (all new jets and tubes and gaskets, plus good cleaning:
Main jet: 170 (tried the 180 but was too rich, same problem as above but would stall on acceleration)
Slow jet: 42 (tried a 45 but had to fight it for the 1/4 throttle turn to keep from stalling)
Needle came from a kit that insisted i drill a little bit into the slide as well, still have a stock needle and slide on hand
Accelerates and idles fine but bellows black smoke on idle and fire on acceleration. I have no where left to go with mixture screw to reduce gas flow
Should I put back on stock slide and needle?
Should I go down a size in slow and main jets? if so what do you think? got a slew of main jets, but will have to pick up a slow jet
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