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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28638
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Engine starts but has no power whatever. JD says I need a

Customer Question

Engine starts but has no power whatever. JD says I need a new engine. Before I do that I need to know a few things. They said the compression should be 130 psi. What is the compression ratio? I have an airplane with 10.5:1 ratio and 75 psi compression is very good.
JA: I'll do all I can to help. Is there anything else the Small Engine Technician should be aware of?
Customer: On a previous situation, I was advised by another JD tech that it had 'dropped a valve' which they fixed...rear cylinder not working at all...engine blowing smoke...I was thinking an ignition problem. A bit skeptical that this engine would need a rebuild ... what is the average Time Between Overhauls?
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: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year ago.

Model number? What engine? Gas Kawasaki would be great at 130 psi!

Customer: replied 1 year ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 1 year ago.
Sorry about the delay...had to rescue gator from John Deere. I'm perplexed at what they told me. It is the 18 hp Kawasaki gas twin. 9.4:1 compression... they said it had only 130 psi with throttle the heck is compression measured with a valve open? I've always done compression tests at TDC with valves closed..what does the throttle have to do with plane is very happy with 75 psi on a compression test...they want 170? Front cylinder is producing no power (stuck open valve?) Rear cylinder is running very idea why but since opening the throttle has little effect on there a timing issue?
Expert:  Curtis B. replied 1 year ago.

140 is plenty of compression. Front cylinder, does it have spark? Are the valves working, pushrod not bent or broken> Vales set at .006 inch?