The dirt bike Sprocket manufacturer tells you to loosen the clamp nuts on both sides of the rear axle and the chain adjustment screw clamp nuts. Tighten the adjusting screw to tighten the chain, and put a steel ruler on the lower chain to make the chain sag by 15~20mm. Note that the amount of adjustment on both sides must be the same so that the wheels will not be biased.

Precautions:
(1) It is advisable to adjust in time to keep the tightness of the motorcycle chain at 15mm-20mm. Check the buffer bearings frequently and add lubricating grease on time. Because the working environment of the bearing is harsh, once it loses lubrication, it may be damaged. Once the bearing is damaged, it will cause the rear chainring to tilt, which will cause the side of the chainring chain to wear out, and the chain will easily fall off if it is serious.
(2) When adjusting the chain, in addition to adjusting according to the adjustment scale of the frame chain, you should also observe whether the front and rear chainrings and the chain are on the same straight line, because if the frame or rear wheel fork has been damaged. The dirt bike Sprocket manufacturer tells you that after the frame or the rear wheel fork is damaged and deformed, adjusting the chain according to its scale will lead to a misunderstanding, mistakenly thinking that the chainring and chain are on the same straight line, but in fact the straightness has been destroyed, so this inspection is very important. Important (it is best to remove the chain box when adjusting), if any problem is found, it should be corrected immediately to avoid future troubles and ensure nothing goes wrong.
(3) When replacing the sprocket chain, you must pay attention to replacing the high-quality products with good materials and fine workmanship (generally, the accessories of special maintenance stations are relatively regular), so as to prolong its service life. Do not be greedy for cheap and buy unqualified products, especially unqualified chainrings, many of which are eccentric and out of range. Once you buy a replacement, you will find that the chain is suddenly tight and loose, and the consequences are unpredictable.
(4) Regularly check the matching gap between the rear wheel fork buffer rubber sleeve and the wheel fork and the wheel fork shaft, because the horizontal gap between the rear wheel fork and the frame is required to be strictly matched, and the up and down movements are flexible. Only in this way can the rear wheel be guaranteed The fork and the frame can be integrated without affecting the shock absorption effect of the rear shock absorber. The connection between the rear wheel fork and the frame is realized through the fork shaft, and it is equipped with buffer rubber sleeves. Since the quality of domestic buffer rubber sleeves is not very stable, it is particularly prone to looseness. Once the joint part is loose, the rear wheel will be displaced under the restraint of the chain when the motorcycle starts or accelerates. The size of the displacement is determined by the degree of damage to the buffer rubber sleeve. The dirt bike Sprocket manufacturer tells you that the rear wheel will vibrate when accelerating and decelerating at the same time. This is also one of the important reasons for the damage of the chainring. More inspection and attention should be done.
(5) Regularly clean the chain and chainring, and add grease in time. In rainy and snowy days and muddy roads, the maintenance of the chain and chainring should be strengthened. The dirt bike Sprocket manufacturer tells you that only in this way can the chain toothing be extended.