Motorcycle engine fault, first check the crankshaft deflection: crankshaft, v-shaped ring deflection is measured with a dial indicator, the deflection degree of 0.05 mm, the use of the crankshaft using limit shall not exceed the limit. Crankshaft deflection degree is too large is usually in the main cause of abnormal vibration in the engine, shorten the service life of the engine vibration, reduce the use of time. So, once more than use restrictions immediately send maintenance department to repair or replacement.


The second check your motorcycle bearing, bearing should be cleaned with solvent cleaning, before bearing and lubricating oil. Then rotation inner sleeve to check if all goes well, if it is found that rotation is not flexible and uneven, and issued a "corn, Carlyle" sound, will further check and steel ball bearing raceway. If found severe pitting corrosion of steel ball and seat, the phenomenon such as flaking, fracture, need to replace new bearing. If the rolling bearing is very normal, smooth, no jam phenomenon, but the "rich" noise is very big, check whether the phenomenon of wear. Check method is: seize the inside and outside the circle, with both hands respectively before and after the hard drive bearing, if feel very big gap between the shaking, replace the new bearing. And then check the bearing oil seal, if it is found that the wear, hardening of the phenomenon, such as oil seal damage will result in a mixture of fuel and air or oil leakage, and so on. This should be replaced immediately oil seal SKF Roller Bearing http://www.skfbearing-china.com/ .


Check again the motorcycle big end bearing: check, turn the crankshaft connecting rod, should be able to feel the big head rotate smoothly. Then firmly fixed on the crankshaft end, tie rod, confirm whether there is a batch of voice. Large degree of wear and tear can by examining the connecting rod motion little head, estimates that this method can also check the big degree of wear parts. The wear degree is less than 3.0 mm, such as wear and tear more than the limit, connecting rod, crank pin and crank pin bearing will repair or replace.


(1) as far as possible, use special instrument measurement method;


(2) the higher the measurement measuring skills. The method measuring error is larger, especially the gap in the edge state, easy to cause errors, at this point, instrument measurement shall prevail;


(3) test, should according to the regulation of standard operation, roller rolling test shall not be used in the past, ways to measure;


(4) measurement in the process, should guarantee the ball fell into the ditch; Closed bearing measurement before closing, using lotus instruments, measuring value minus the gap caused by the increased load.


(5) more for each column column bearing clearance, clearance of arithmetic average as bearing radial clearance of columns.