Savage_Greg wrote on 12/31/69 at 16:00:09:I almost wonder if it couldn't have something to do with ignition timing and maybe different grades of gasoline.
Seems like I read euro gas varies from U.S. spec gas.
I have noticed our summer reciepe oxygenated gas seems to backfire more.
I remember 70's car's idle solinoid that would energize w/ ignition circuit then, on shut off, would spring-return away from the idle stop screw, closing the thottle plate compleatly and was supposed to kill the run-on.
The compression release is a much better fix.
I wonder perhaps if the idle is set to high and aggrevates this 'backlash'?
I seem to have had heard this backlash once while the bike was new to me.
Now in order to prevent bluing/excessive heat while in traffic, I tend to idle my stock Suzy down after a mile or 2, blip it and listen a couple times while waiting for a traffic light to change. I will set it as low as it will go and still run. This will require the throttle be bliped on decel to prevent it from dieing while rolling up to a light w/clutch in and that the idle adjuster up 1/2 turn when cold starting too. backfires are less common,but it's summer and I expect them to increase w/ cooler weather. I pulled the idle brass plug long ago and tend to keep the mixture screw a little fat to help w/ backfires.
BTW; On occasion, it seems to idle faster so I slow it, then it may be too slow @ the next light and I put it back.
I will blip it and quickly & completely open my rt. hand and let it snap back to idle stop, then push the throttle shaft against the idle stop to check if the return spring is closing all the way. It never slows down, so it seems to always be fully returning, yet idle speed tend to vary sometimes. I guess it's just engine temp vs. weather/air density.
I have not noticed the backlash problem since I tend to keep the idle down.
It seems like this may help prevent that problem?
P.S. Nice diagram there general. I see you have been promoted to 5-stars.