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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26016
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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How do you set the valves on a 25hp.757 John deere JA: I'll

Customer Question

How do you set the valves on a 25hp.757 John deere
JA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.
Customer: Engine is back firing, the valves have never been set. It's 2005
JA: Is there anything else the Small Engine Technician should be aware of?
Customer: Starts fine, just started back firing
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and then connect you two.
Submitted: 7 months ago.
Category: Small Engine
Expert:  Curtis B. replied 7 months ago.
.004 to .006 intake and exhaust. I like to turn till one valve is down and then set the one that s up. Then rotate till the one you just set is down and the other is up. That always works. Manual take spark plug out and turn till you feel compression, feel for the piston, bring piston up to TDC and set both valves at same time. But it works the same.
Expert:  Curtis B. replied 7 months ago.
Pull spark plug wires off one at a time to see if it is just one side backfiring.
Expert:  Curtis B. replied 7 months ago.
Did you see my response? Please rate to close.