Motorcycle engine abnormal sound
Idle instability and carburetor plunger wedge groove and idling adjustment wire that there is no relationship, there is a small pit is normal, mainly long-term use when grinding out. For the old car, the idle instability and the cylinder compression (such as the valve closed lax, the cylinder pressure is too low, etc.) and carburetor atomization is not good, it is recommended to check the valve clearance and valve and valve seat closed Condition, and then check, clean, adjust carburetor.
Rear wheel around the swing, the first should check whether the rear rim is about the rim of the rim is not correct, whether the rear tire is not installed or tire drums, and whether the tube has a thick patch and so on. In addition, the rear fork bushing loose, after the shock is too soft or soft and hard is not the same, the tire is too soft and the tire is too high, the chain device is also inconsistent, etc. will cause the rear wheel swing.
Change the time, I do not know what happens when, but there may be wear with the clutch or the rear wheel of the damage to the block.
the valve has abnormal sound and no adjustment through the adjustment to eliminate, mostly the valve rocker and camshaft wear, in addition, because do not know the jack or the chain machine, so this sound is the problem of gas distribution system, such as The vents of the plunger, the upper and lower rocker arm and the cooperation between them, the timing of the chain machine chain, chain tensioner, timing sprocket wear and tear, will appear this sound. Valve spring, such as check is not broken (this situation is very small), generally do not issue abnormal sound.
sound problems, can not hear bad judgment, but the crankshaft, crankshaft bearings and magnetic motor loose will be issued more boring sound, but the possibility of loose magnetic motor can be ruled out, and if it is crankshaft or crankshaft bearing out The problem, the general sound will be relatively bad, more obvious "frame" sound is generally used under long-term use, the crankshaft itself caused by the deterioration of the dynamic balance, which in addition to changing the crankshaft is generally not easy to eliminate. In addition, the crankcase in the long-term use, will happen a little variant, but simply do not find, if the crankcase is too old, no matter how crankshaft is useless. In addition, like the clutch hub may also be issued a similar sound, it is recommended to find an experienced, reputable repair staff to check
