savage_joe wrote on 12/31/69 at 16:00:07:Thanks guys for all the help.
<snip> White spacer in place. It fired right up with no choke and was idling pretty good, after warming the bike up some I was able to lower the idle speed down and adjust the mixture. Dremel to cut new groove in stripped out mixture screw....priceless
<snip>I am seeing a slight hesitation coming off idle with some black smoke, but after that it pulls good. Some backfires once in a while on decel, but not too bad.
<snip>I also see a tiny bit of whitish smoke come out on decel just when the rpms drop down to idle, only a little bit and then it clears right up.
I do have the 125 butterfly
Thanks again for all the help...Joe
So, a good cleaning was all it needed. Good point. That proves to be the "best first" thing to do rather than replacing parts. Right?
Black smoke and a little hestitation off idle? Too rich. Not an issue of the spacer. Change your air filter (and drain the airbox). Maybe turn your mixture screw in a little bit more.
The occassional backfires or pops are normal after all....not just for the Savage but other air cooled thumpers too.
Whitish smoke on decel? Oil. An older engine. Good chance that (as someone else pointed out) you could have old valve guide seals. Could be dried out from sitting a while. The throttle closed decel action causes a more negative pressure (suction) within the combustion chamber (which is partly the reason that you slow down anyway). I wouldn't worry too much....
BTW - whitish smoke can also be rings, but that is more common on accel, AND you already checked the compression anyway.
You DO have an early vintage carb. I DO NOT recommend that you follow any of the common practices that you read about in this forum. Your stock carb is probably better tuned than mine as it is. Anything you do will be experimental as far as I see it, but in the future you may be able to assist others with an '86 - '88 carb.
You are most welcome, too.