backfiring!!!!!!!
- Thread starter deanjdk
- Start date
u'll need a colder plug like aa ngk 10 or iw27 or 31.
reduce the gap way down and see if it makes it better
then make the gap very large and see does it worsen the symptoms
if u have a multimeter check for resistance between the engine and the negative of the battery
there should be a short circuit
i know for a fact the backfiring is down to your plug
ive had the same problem in my scooter many times
once i tried an IW31 in a standard scooter and the thing backfired like crazy
also a hot plug like an 8 or so will cause a race tuned cylinder to backfire
reduce the gap way down and see if it makes it better
then make the gap very large and see does it worsen the symptoms
if u have a multimeter check for resistance between the engine and the negative of the battery
there should be a short circuit
i know for a fact the backfiring is down to your plug
ive had the same problem in my scooter many times
once i tried an IW31 in a standard scooter and the thing backfired like crazy
also a hot plug like an 8 or so will cause a race tuned cylinder to backfire
Cruz_e_Silva
R^4
It's an electrical problem...maybe a damaged cdi or pickup.
tiba_karotsu
OVERREV TUNING
go borrow a cdi from somebody with the same scooter as yours if the problem disappears then your cdi is shot, also try to add a wire connection from the frame to the engine it could just be a connection problem it happened to a cousin's scooter this afternoon & it was just a loose ground wire.
tiba_karotsu
OVERREV TUNING
yup there's an earth (ground) wire coming from the CDI you better make sure it's also connected.
ok...iv checked the cdi/changed spark plug to one with .4mm gap/changed fuel inlet manifold/checked coil for visual damage and STILL its the same.there is 3 wire coming from the cdi and goin to the flywheel....i havent checked the connections at the flywheel yet but the connections are ok at the cdi
iv also pumped out some but not all of the crappy 95 octane with too much booster in it.there was 5 litres of that stuff in there and i pumped out about 1 litre of that and put 5 more litres of 99 octane with the"right " amount of booster to fuel ratio...could this still be the problem.
this what happens when i try to drive the bike,,,,
i leave in ticking over for about 4/5 minutes to warm up
i take off and slowly go down the road to clear the excess two stroke oil from the system.when the blue smoke stops pouring from the system i bring it to full throttle....it revs high and goes fast for a few seconds and then i loose power and it starts spluttering and backfiring.any more suggestions?
iv also pumped out some but not all of the crappy 95 octane with too much booster in it.there was 5 litres of that stuff in there and i pumped out about 1 litre of that and put 5 more litres of 99 octane with the"right " amount of booster to fuel ratio...could this still be the problem.
this what happens when i try to drive the bike,,,,
i leave in ticking over for about 4/5 minutes to warm up
i take off and slowly go down the road to clear the excess two stroke oil from the system.when the blue smoke stops pouring from the system i bring it to full throttle....it revs high and goes fast for a few seconds and then i loose power and it starts spluttering and backfiring.any more suggestions?
o yea...my email address is deanjdk@hotmail.com if anyone wants to add me to their msn messenger i will take a qick video of my bike backfiring and send it to them to see if they can assess the situation better
tiba_karotsu
OVERREV TUNING
darn! i forgot about the crankshaft oil seals! i also remember having that same problem with sputtering that doesn't go awya no matter how much you do with everything. you could be on to something there mate don't hesitate open up that engine and check those oil seals.
no browni...i havent changed the cdi for a test yet..i havent had much time over the last few days but i will take the one from another gilera i have here once i get the chance.also ...when im checking the seals...what is the best way to do so???will i just try feel for air escaping from both sides of the crank or is there a better way e.g. with a curved feeler gauge or something like that....what way would "you " do it browni/tiba karotsu?
