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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14990
Experience:  Certified on Onan and Generac generators
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Scharf Onan 4.5 BGD-FB/30502M truck mount generator cranks

Customer Question

Customer: Tim Scharf Onan 4.5 BGD-FB/30502M truck mount generator cranks wont start and run unless throttle is manually opened.
JA: Thanks. Can you give me any more details about your issue?
Customer: Two modes of operation: winter/summer same symptom both modes cranks throttle does not open automatically
JA: OK got it. Last thing — JustAnswer charges a fee (generally around $18) to post your type of question to Small Engine Experts (you only pay if satisfied). There are a couple customers ahead of you. Are you willing to wait a bit?
Customer: Yes
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Submitted: 1 year ago.
Category: Small Engine
Expert:  Hank F. replied 1 year ago.

There can be many things that cause this:

Dity carburetor

Bad spark plug

Worn engine

Dirty air filter

Governor not operating properly