Crankshaft deflection of the engine is too large often causes abnormal vibration; the vibration will shorten engine life. Therefore, beyond the limits should be used to send repair sector repair or replacement.

Check the bearings; you should first clean the bearings with a cleaning solvent, and with oil lubrication. Check the rotating inner race rotation is smooth, if the rotation is not flexible, uniform, and there is "Kadar " is a crash, should further examine the track ball and the ball. If the ball and the seat of serious pit, peel, crack, etc., will replaced with new bearings. If the bearings turning up very smooth no arrest phenomenon, but the "rushing" a great noise, check for wear off very. Check the method used to live in the outer two-handed grip, front and rear drive bearings, if the gap was much shaking, and it should replace the bearings.

Then check the bearing oil seal, if there is wear and tear, rupture, hardening phenomenon could lead to damage oil seal on the fuel and air mixture or oil leakage. This seal should be replaced.
 

Check the connecting rod bearings; the rotation of the crankshaft with connecting rod should feel smooth spins in the bulk. Can be firmly fixed while the crankshaft, connecting rod while pulling up and down, to confirm whether the bulk of the sound. Connecting rod wear by checking connecting rod small end of the swing to estimate, this method can also check the connecting rod parts swear. Such as wear and tear over the limit, connecting rod, crank pin and crank pin bearings should be fully repaired or replaced. Wear shall not exceed 3.0mm.



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