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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 27469
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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1991 Yamaha extreme back firing and losing power going up

Customer Question

1991 Yamaha extreme back firing and losing power going up hills. It does need a new plug, fuel filter and air filter but this typically is not the fix for back firing. Please let me know.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year ago.

Rear pin doesn't go through to outside?

Expert:  Curtis B. replied 1 year ago.

i remember the pin going through from one side to the other!

Customer: replied 1 year ago.
sorry...what do you mean by rear pin?
Expert:  Curtis B. replied 1 year ago.

let me opt out!

Customer: replied 1 year ago.
will another technician reply? I remember you helped me fix this carts electrical issue back about 2 months ago..
Expert:  Curtis B. replied 1 year ago.

What is model?ATV?

Expert:  Curtis B. replied 1 year ago.

Gas golf cart?

Expert:  Curtis B. replied 1 year ago.

Single cylinder or twin?

Customer: replied 1 year ago.
Gas golf cart
Expert:  Curtis B. replied 1 year ago.

Four cycle? WHat about valves?

Customer: replied 1 year ago.
Four cycle. Single spark plug so probably 2 valves.
Expert:  Curtis B. replied 1 year ago.

Check valve adjustment. .004 inch intake and exhaust.