I'm fighting for riding days here in Minnesota as it begins to cool off - my 77 shovel has been running very well - but now I'm getting hard pops out the carb in the midrange power band - real hard pops - bike misses than picks back up - only pops once in a while but it does it enough to be a real problem - last time it did this it was my points gap too tight from the rubbing block on the points arm wearing - I've set the float height multiple times - screwed with everything - I have 5 other bikes with very well tuned Bendix carbs - and I tuned them - this one is starting to worry me - advance weights look good - timing is near perfect - gap is .018 - plugs are new - not sure where to go now on this - maybe swap a carb out? set the float height higher? thoughts????

 

By all means swap carbs...then you will learn quickly

 

its very odd - it pops hard out the carb and sort of cuts out then bang right back pulling hard - idles fine - plugs look good - motor does not run hot - points new - condensor new - timing set right on - raining here now so won;t be able to ride to work tomorrow morning

 

Had one doing that and found the main circuit breaker was tripping out, drove me crazy chasing that gremlin and would only do it at speed not at idle.

 

yeah - this is what worries me - it seems to cut-out - but it is one big pop than right back with power - I might switch out the coil as well - this is the **** I hate - I can weld and remachine a 50 year old set of cases but I can't find a pop in the carb to save my ***

 

I do the easy **** first...But, YMMV
Change the carb so ya Know.......

 

This ones easy just jumper the circuit breaker and ride hell out of it, still does it one possible issue eliminated. Doubt the coil it would be ignorant all ranges.

 

switched out the Autolites for Splitfire plugs this morning - only popped three times during decelleration into turns - pretty odd - the Autolites were new - although I did flood the bike prior to this starting - plugs look okay though - runnin .034 gaps with points and 5ohm coil with copper wire plug wires

 

so got home from work tonight at 10:30 - bike ran great - looked at the spark plugs I took out and one fo the gaps was like ,010 - I now recalled I dropped that plug when I was "reading it" the other night - I did not think it hit the electrode but it must have - so the hard pops were caused by a tight gap - I believe this caused misfires - when the unburnt mix got pushed back through the overlap cycle it was ignited by the dual fire and POP goes the weasel