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Demon Carburator Tuning
Staff Writer
04/06/2014
10 min read
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Demon Carburator Tuning
Demon Carburator Tuning
Staff Writer
04/06/2014
10 min read
Demon
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(1)
Symptom - Fuel comes out of vent tube or runs out
Lower float level
Decrease fuel pressure
Remove, clean/replace needle-&-seat
Inspect float to ensure it's moving freely
Symptom - Backfires or Pops through carburetor
Open idle-mixture screws
Increase squirter size
Increase jet size
Raise float level
Symptom - Backfires or Pops through exhaust
Lower float level
Decrease fuel pressure
Decrease jet size
Readjust butterfly position, primary & secondary
Symptom - Engine won't start
Prime carburetor with fuel
Pump squirters to get fuel flowing
Check ignition timing
Symptom - Fuel leaks from throttle shafts
Lower float level
Decrease fuel pressure
Readjust butterfly position, primary & secondary
Symptom - Is rich at idle
Increase initial timing
Go in on mixture screws
Readjust butterfly positions
Lower float level
Decrease fuel pressure
Symptom - Stumbles under light acceleration
Open mixture screws
Readjust butterfly positions
Raise float level
Symptom - Stumbles under hard acceleration
Readjust butterfly position
Increase squirter size
Symptom - Won't return to idle
Increase initial timing
Readjust butterflies
Symptom - Surges at part throttle
Open idle-mixture screws
Open primary butterflies & close secondary
Raise float level
Increase jet size
Symptom - Emits black smoke under hard acceleration
Lower float level
Decrease fuel pressure
Decrease jet size
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Staff Writer
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Demon
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