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Backfire
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Alfieboy
UTC
Member
Px - sprint - lambretta li
Joined: UTC
Posts: 17
Location: Herts uk
 
Alfieboy
Member
Px - sprint - lambretta li
Joined: UTC
Posts: 17
Location: Herts uk
UTC quote
Hi all have a new problem my Vespa sprint has a bad miss fire the points are spot on 0.40 fuel flow good was running really we'll put it away two weeks ago got it out to day will not run just back fires
Could it be the condenser
@starreem avatar
starreem
UTC
Ossessionato
07 GTS250(RIP), 07 LX150, Several Lambrettas
Joined: UTC
Posts: 2834
Location: Raleigh, NC
 
starreem
Ossessionato
@starreem avatar
07 GTS250(RIP), 07 LX150, Several Lambrettas
Joined: UTC
Posts: 2834
Location: Raleigh, NC
UTC quote
In my experience, backfiring is usually a timing issue. Check your woodruff key is still in one piece, and the flywheel is mated up properly to the crank.
Bluecati
UTC
Addicted
Old douglas ..smallie with polini 115..super with nasco 177
Joined: UTC
Posts: 685
Location: New Zealand
 
Bluecati
Addicted
Old douglas ..smallie with polini 115..super with nasco 177
Joined: UTC
Posts: 685
Location: New Zealand
UTC quote
It smacks of condensor issues
Assuming the wood ruff key is sound then its the Condensor.Take a photo of the junction box connections..Pull the entire stator out on the bench..and also replace the points at the same time Good luck
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