I am trying to get my 1980 XS650 going again. I have got the bike so that it idles nice but when i go to accelerate it backfires and misses, is that due to a lean mixture or is that a timing issue? Im pretty new at tuning bikes so any assistance would be appreciated. Does anyone know the specific presets for the BS34 carbs? Could it be faulty or dirty points?
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Backfiring during acceleration
- Thread starter mike99
- Start date
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- Tags
- carburetors electrical
If the bike has the original ignition, it would be an electronic set-up and pre-set from the factory. There are no points or timing adjustments. The carbs may need to be cleaned, or cleaned again if you've already done so. Sometimes it takes a couple cleanings to get them really done right. Set the mix screws at between 3 and 3 1/2 turns out. Anything less could cause some of that popping.
Boles44
XS650 Member
Where are the mixture screws?
NONclow
Confirmed Laquer Breather
scabber
XS650 Guru
Screws are on the top of carb intake side. Sometimes covered with a metal cap. Read the carb guide.
