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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28321
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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1705hp briggs eng. model 31c707 eng starts norm 7 IDLESA NO

Customer Question

1705hp briggs eng. model 31c707 eng starts norm 7 IDLESA NO PROB. Backfires when advancing rpm if I go to chock slow as chock starts to take hol at a point eng. will run norm I belive lack of fuel
belive it is a nikki carb never had much exp. w/the newer eng.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year ago.

Nikki carb link above.

Expert:  Curtis B. replied 1 year ago.

walbro carb link.

Expert:  Curtis B. replied 1 year ago.

Backfiring can be valve adjustment needed. The backfire is indication that a valve is open, when spark occurs.

Expert:  Curtis B. replied 1 year ago.

Have you checked the valves? .004 to .006 inch intake and exhaust.

Expert:  Curtis B. replied 1 year ago.

I see question is still open, did you see my response?