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Discussion Starter · #1 ·
Having some trouble getting my bike dialed in, its a '71 T120 with dual Amal 930's. . I'm getting a steady popping and black smoke out of the left pipe. Right side running perfect.

Been through the carb a couple times, cleaned the hell out of it, cleared the pilot jet with a guitar string. Strobe timed at 38 btdc, running a Hunt magneto for ignition.

Carbs were low mileage when I bought them, so I had them honed/brass slides installed to take slide slop out. Would a worn needle jet cause this?

Thanks for any ideas on what check out.
 

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Discussion Starter · #6 ·
Whenever you're sure it's a carb problem, it's usually the electrics.....
Yeah I agree, but ignition is supplied by a Hunt mag so there really isn't alot that can go wrong. It has new condenser and points. . I also checked the points gap and checked I have consistent fat spark.

Gonna swap carbs left for right tomorrow morning and swap out the NGK plugs for Champions.

Anybody running velocity stacks with baffled cocktail shaker mufflers? Any recommendations on jetting are also appreciated.

Thanks.
 
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