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Both, chains and sprockets have "pitch" if they are not the same pitch the chain will become tight then loose breaking the bearings and destroying the chain
Check the chain tension as you cut. The chain will stretch as it warms up. Be sure the side bolts that hold the bar are snug. Lift the bar upward when you are adjusting the chain and while you tighten the side bolts. Never cut with a loose chain.
Yes. Loosen the two nuts on the back wheel. When they are loose just pull the wheel back until the chain is tight enough and tighten nuts while holding the tire in the proper position at the proper tightness of the chain. Make sure that the tire is running true when tightened.
Your chain is too loose or it is worn out. Adjust the tension on the chain. The chain should not hang away from the bar but should be loose enough that you can pull it away from the bar with not much effort. Adjust the tension until it is set correctly.
The most likely cause is a loose chain. Chain Adjustment
Make sure the chain brake is off (gloves will protest your fingers).
If necessary, loosen the bar nuts that are clamping the clutch cover in place (or whatever holds the clutch cover and bar on). They do not need these really loose - finger tight will do.
Ease the tension adjustment until the chain is obviously loose.
Using one hand, hold the nose of the bar up.
While holding the nose up, adjust the tensioner so that the center of the chain just touches the underside of the bar, add a touch more.
Continue holding the nose of the bar up & tighten up the bar nuts / bolts / quick-release system.
check the cog that the chain runs on, the one on the back of the centrifugal clutch they are supposed to be changed when you change the bar ((i dont bother until iget symptoms like yours or the chain starts to get tight and loose tight and loose)
I had a few chain driven polaris atv's they tension when weight is on the quad, the rear arm pivots and applies tension to the chain , other then that there should just be guides for the chain. If the chain is still loose with operator weight the chain may have play in the pins and need replaced.
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