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Post by rider95 on Apr 6, 2013 20:21:44 GMT -5
I just put a BBK in, its a 47mm kit it dosent run very strong something is a miss . Compression is 120 lb think this should be higher I have checked the vales @ 04 ther not to tight , even when I squrit oil in the plug hole it only goes up about 5 more lbs . Shouldn,t it be higher?
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Post by justbuggin2 on Apr 6, 2013 20:26:31 GMT -5
did you stagger the rings when you put the BBK on if not the you will have lower compression and did you home the cylinder it helps the rings to seat
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Post by tvnacman on Apr 6, 2013 20:30:56 GMT -5
did you stagger the rings when you put the BBK on if not the you will have lower compression and did you home the cylinder it helps the rings to seat 2nd this recheck your valves , if the carb is connected open the throttle all the way opened . Make sure you have a fully charged battery and retest . John |
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Post by rider95 on Apr 6, 2013 20:48:24 GMT -5
the sliver ring was on top then Black
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Post by justbuggin2 on Apr 6, 2013 21:15:24 GMT -5
what i mean is to stagger the rings is the end gap if they are lined up you will have low compression they need to be set as far apart as possible like 8 2 and 6 oclock prosition
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Post by indymoped on Apr 6, 2013 21:56:13 GMT -5
f your compression didnt raise much by squirting oil in the cylinder it is most likely nothing to do with the rings sealing its probably your valves leaking a little bit.
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Post by alleyoop on Apr 6, 2013 22:06:05 GMT -5
Just F.Y.I when checking compression you have to hold the throttle wide open otherwise it will register low. It has to suck in as much air as possible, motors run with lots of air and a little bit of fuel.
Alleyoop
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Post by rider95 on Apr 6, 2013 22:07:56 GMT -5
I took the head off turnd it upside down and filled it with wd40 none leaked out , The valves are both set @ 04, and it is a brand new head. I did and try the old head too same 115lb to 120
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Post by rider95 on Apr 6, 2013 22:12:18 GMT -5
And yes I hold the throttle wfo I have one off scrappys 52mm also I might try that but dont think the starter can handle that
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Post by millsc on Apr 6, 2013 23:22:55 GMT -5
the starter can handle scrappys 52mm kit i have it on both my scoots use two base gaskets
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Post by triker on Apr 7, 2013 0:21:54 GMT -5
Did you check the ring end gap? 1st ring gap should be.007 inches the 2nd ring gap should be .009 inches
Roy
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..BAD TO THE BONE..
