Post by dyoung1167 on Apr 26, 2017 9:00:11 GMT -6
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.
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.
