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my father always boiled dirty carbs in white vinegar. a bit stinky for the house so a grill for this would be helpful. I do not remember if it was in the pot as heated or put in after the boiling started but but i can say, we never once bought a new carb or even rebuild kits and i'm talking 6 very frequently used and abused dirt bikes.

and when i say visually i mean just that, i can see directly into the spark plug hole and watch the piston move.

my lazy butt drove my scooter 150cc qmj for a good while with the lack of the lower cam tension/guide. it actually ran fairly well with the exception of it reverse firing 1,2 maybe 3 times before running. by that i mean it would try to send the piston backwards and stop rotation dead in its tracks. i figured this was due to a slack cam chain.

Anyway, i finally replaced said guide and now have proper tension and i am able to visually see that the piston is reaching exactly TDC as the whole in the cam sprocket gets to center. that said there is of course about a tooth or half a tooth or so play just after this meaning it is still tdc but the alignment whole would be slightly forward of center.

what i'm getting at is the scooter is still giving me these firing in reverse moments before it finally runs. should i try putting it one tooth back? or would it not help? nothing about the spark or spark timing has changed although i'm under the impression that i could ever so slightly retard the timing at the pickup without any true mods and not sure what little i could get would matter anyway.

trade the port on the new carb with the one from your old carb (just the cover, keep the new diaphram), and i don't see any mention of checking/adjusting valves. they are often a reason for not starting.

i'm not sure why but i get this too, always have. something about making the tire more ridged with the brake tight at idle and sitting still allows the normal vibration of the motor to be more pronounced though the frame. it has never caused a problem though.