Hey,
A GP200, 22mm jetex, 125 main, scootrs pipe. Plug chops after a long ride is okay, light tea, could be a bit darker but I did not think alarming. At 3/4 throttle it back fires. Is this electrical? If so why? I can change the CDI and see if that helps, but I'd like to learn what the underlying issue is.
Tx
David
Backfire past 3/4 throttle
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- registered user
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- Main scooter: Early Eibar Jet 200
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carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
The only time I had a CDi fail. It began with backfiring as the revs went up.
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- registered user
- Posts: 225
- Joined: Sun Jun 10, 2012 11:41 am
- Main scooter: Early Eibar Jet 200
- Contact:
Just as I suspected. Many thanks
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carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
carpe scooter diem
1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200
-
- registered user
- Posts: 395
- Joined: Wed Oct 12, 2016 10:18 pm
- Main scooter: lambretta 64 li 150 Special
- Contact:
what was the outcome David ? I'm curious .
If it were me and I wanted to try and narrow down whether it was an ignition or fuel related problem I'd probably ride the scoot steady at 3/4 throttle and then apply a little choke and see what happened.
If it was an electrical /ignition issue, the additional fuel shouldn't have any effect on the backfiring but saying that I believe a exhaust manifold/silencer leak can cause backfiring too .
If it were me and I wanted to try and narrow down whether it was an ignition or fuel related problem I'd probably ride the scoot steady at 3/4 throttle and then apply a little choke and see what happened.
If it was an electrical /ignition issue, the additional fuel shouldn't have any effect on the backfiring but saying that I believe a exhaust manifold/silencer leak can cause backfiring too .