Topic: Bike won't start with carb sync gauge attached

[Texas Ty]

Background info:

Freshly rebuilt (top end) '76 550. I can get the bike to start and hold a rough idle after a bench sync, but with the gauges attached it doesn't seem to want to fire.

Ignition timing was set with a test light and is spot on. Compression reads good across the board.

I bought the gauges from Dime City, maybe it was a mistake to cheap out? My suspicion is a vacuum leak with the brass adapters attached.

Anyone had this problem before?

Thanks


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[guitarkev66]

do they have the rubber o rings on the brass adapters?

[Texas Ty]

They do. However when I screw the adapters in it does not seem like the o rings are engaging if that makes sense. They sort of walk up the adapter instead of being fully compressed and sealing. 


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[guitarkev66]

Can you take a pic?

[Steve_K]

Maybe the o rings need to be closer to the end.  I mean, adjust the nut on the brass tube so the o rings are tight on the carbs.  That keeps the engine from getting too much air making it lean.
Steve

[guitarkev66]

Maybe the o rings need to be closer to the end.  I mean, adjust the nut on the brass tube so the o rings are tight on the carbs.  That keeps the engine from getting too much air making it lean.
Steve

+1

[Texas Ty]

Steve_K, these adapters don't have nuts like the Honda ones.

I ended up solving it by putting some slightly smaller o rings on the brass fittings. What a pain!

Anyway all is solved. Thanks for the help fellas!


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