'07 American Lifan LF200GY-5 problem

JunkyardDog · 02-17-2009, 03:28 PM

Is anyone here familiar with the counterbalanced engine used in the '07 American Lifan LF200GY-5? I have one with almost 30,000 klms on it, all mine. A few thousand klms ago, it started making a loud knocking noise. I removed the right engine sidecover (clutch cover), and quickly found the problem. Just forward of the clutch assembly is a doorknob looking thing with a cap on it. The cap is held on with 3 phillips screws. The whole thing was loose, which was what was making the noise. I removed the 3 screws, removed the cap, there is a gasket under it. The other part of this thing is bolted onto the end of a shaft with a weird looking concave nut and washer. A regular socket will not fit it. I took everything apart, cleaned everything with contact cleaner, put it back together with red LokTite, and tightened it as tight as I could get it with needle nose visegrips. It lasted for a couple thousand klms, and came loose again. Does anybody know what this thing is? I think it is part of the balancer assembly, somebody else told me it is part of the oil pump. It doesn't look like an oil pump to me. Does anybody know where to get a socket that will fit this nut? If not, I may be able to make one. Also, does anybody know what the torque should be on this nut? The bike runs fine except for this problem. Thanks, Jerry.

02-17-2009, 03:28 PM	#1
JunkyardDog Join Date: Aug 2007 Posts: 11	'07 American Lifan LF200GY-5 problem Is anyone here familiar with the counterbalanced engine used in the '07 American Lifan LF200GY-5? I have one with almost 30,000 klms on it, all mine. A few thousand klms ago, it started making a loud knocking noise. I removed the right engine sidecover (clutch cover), and quickly found the problem. Just forward of the clutch assembly is a doorknob looking thing with a cap on it. The cap is held on with 3 phillips screws. The whole thing was loose, which was what was making the noise. I removed the 3 screws, removed the cap, there is a gasket under it. The other part of this thing is bolted onto the end of a shaft with a weird looking concave nut and washer. A regular socket will not fit it. I took everything apart, cleaned everything with contact cleaner, put it back together with red LokTite, and tightened it as tight as I could get it with needle nose visegrips. It lasted for a couple thousand klms, and came loose again. Does anybody know what this thing is? I think it is part of the balancer assembly, somebody else told me it is part of the oil pump. It doesn't look like an oil pump to me. Does anybody know where to get a socket that will fit this nut? If not, I may be able to make one. Also, does anybody know what the torque should be on this nut? The bike runs fine except for this problem. Thanks, Jerry.
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