Home › Forum › Ask A Member › Weird JW compression test. › Re: Weird JW compression test.
Stanley, even with a compression of 70/70 psi, the motor should be able to start and idle decently without having to shoot fuel mix into the intake. Remember introduction of fuel mix into the crankcase takes sufficent amount of pressure differences with in the crankcase.
Things that can cause poor introduction of fuel into the crankcase.(excluding carburetor issues and compression)
-broken or fixed reed valves/leaflets
-obstructed or partial obstructed intake or exhaust ports.
-obstructed or partial obstructed exhaust housing or lower unit foot.
-worn or damaged piston skirting
These conditions can prevent proper air flow through the crankcase and thus prevent proper fuel/air delivery.
Easiest things to check and ruleout are lower unit foot and exhaust housing obstructions from trash, insect nest, build up of fuel/oil mix goo that clumped up over time obstructing air flow out.
May not be your issue, but if you have ruled out your carburetor, ignition, and you have decent compression, then these are possible issues.
Cheers,
Cajun