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Louie
Louie, Technician
Category: Motorcycle
Satisfied Customers: 11447
Experience:  25+ yrs. experience
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I have an 87 750 Vulcan that will start and idle but floods

Customer Question

I have an 87 750 Vulcan that will start and idle but floods out as soon as any throttle is given. What are some possible scenarios?
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, possibilities; ...either be an electrical/ignition issue (most likely) or a fuel/delivery concern (least likely).

Proposed preliminary checks (if have not been done) on the possibility of over/under-voltage, regulator/rectifier and/or stator issue. With a volt/multi-meter, determine the battery voltage when:

  • • ignition OFF and then when ON;
  • • when starting the engine;
  • • engine at idle;
  • • when attempting to rev the engine.

Additionally, try revving the Vulcan with the regulator temporarily disconnected.

Please post back results / observations of the above once tried.

Customer: replied 1 year ago.
Updated information: I was told the carburetor is dumping gas into the piston and it was flooding out.
Expert:  Louie replied 1 year ago.

Appreciate the update and very significant information.

With "...carburetor is dumping gas into the piston...", then the most likely suspect would be the fuel inlet needle valve failing to seal inlet port when the carb bowl is full and float has risen. Possibilities then are:

This would require that the carbs be pulled out, dis-assembled, all metal parts soaked in cleaning solution and cleaning to remove varnish like dried residue. In most instances, a special cleaning tool similar to the product shown HERE would be needed.

It may be to your advantage to consider a repair kit similar to the product shown HERE.

Perhaps the exploded parts diagram HERE may help shed additional insight.