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04-28-2013, 06:27 PM
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#1 |
 Join Date: Apr 2013
Posts: 1
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compression?
I've got a 150cc jmstar and I cleaned the carb and did a compression test, but it's reading 125 on my compression so I put a little oil in the cylinder and compression jumped to 150. So I think it may be the rings.. And also when I start it up it'll run fine for about 30 seconds then the motor revs high without me giving any throttle. any suggestions to what it could be?
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04-28-2013, 10:55 PM
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#2 |
 Join Date: Jan 2010
Posts: 139
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Possible air leak in the intake somewhere. Also have the valves been adjusted?
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04-29-2013, 04:22 PM
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#3 |
Join Date: Aug 2011
Location: Buncombe Co. N.C.
Posts: 337
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If putting oil in the Cylinder raises compression, then you probably have a scarred cylinder, or wore rings.
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2007 Sportiva Falcon GY6 150 4T 7,200+ Mi. 68 ( GPS Verified ) 76 MPG Few Mods, Lots-O-Tweaks 2003 Vento Zip R3i TurboCam 50cc 2T 8,500+ Mi. 62mph ( GPS Verified ) 90 MPG Seriously Modded Check out the new group for the Mountain Area! http://www.scootdawg.net/group.php?groupid=4 |
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04-29-2013, 10:08 PM
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#4 |
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Join Date: Jul 2008
Location: way up north in arkansas
Posts: 99
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How many miles have you put on it? If it is new or low mileage the rings may not be seated. If there is a lot of miles on it you can make plans for new rings or top end.
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1983 Yamaha Riva 180cc 2007 Yamaha Majesty 400cc |
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