Clinician
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Post by fonz on Dec 10, 2015 12:29:27 GMT -6
Install new top end for my honda scooter. Have no compression. I think I followed the maual properly. Have no idea what is wrong. Help!!
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Post by cyborg on Dec 10, 2015 12:42:55 GMT -6
I'm not trying to be a smart a$$,,but did you get the rings on correctly? and when you put the rocker arms installed correctly and valve lash set at top dead center so the valves are not hanging open?
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Administrator
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Post by JR on Dec 10, 2015 12:51:05 GMT -6
Timing? If the timing is off the valves may be open on the compression stroke as well as the exhaust stroke, lastly did you inspect the vales on the head for a good seat? I've bought brand new heads and the seat was terrible and leaking. I always pull the valves and seat them with some compound before I put one together. Learned my lesson by putting a engine together with a new head and same thing no compression and found the leaking by valve, never again will I do that.
JR
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Clinician
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Post by fonz on Dec 11, 2015 6:05:18 GMT -6
Rings are set correctly. Set timing by flywheel and cam. I am leaning to the new valves leaking.
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Clinician
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Post by fonz on Dec 11, 2015 6:06:52 GMT -6
Leaning to the new valves leaking. Anyway to check them.
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Post by Alleyoop on Dec 11, 2015 12:46:59 GMT -6
Yes but you need a Leak Down Tester or make your own but you still need air to fill the chamber then see if air is escaping by the intake manifold( intake valve leaking or air is escaping through the exhaust( exhaust valve leaking).
Or you can try taking off the head and fill the each valve with gas or carb cleaner and see if it leaks past the valve head and out the stem side.
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..BAD TO THE BONE..