Question about Motorcycles
This is the way PROFESSIONAL mechanics do a chain/sprocket check and drive chain alignment and tension.. Proper chain tension is very important to the life of your chain and sprockets and performance of your bike. First, you need to check to see if the chain/sprockets need replacing. (Chain and sprockets are ALWAYS replaced as a set (-all-3)..if you replace a chain on worn sprockets.. the chain will stretch out QUICK.. and if you put new sprockets with a worn chain.. the sprockets will be worn out QUICK too!!) ...To do this..the bike needs to be on the center stand or bike stand...NOT on the side stand...
...now...--remove the chain guard-- next..Sprocket check time - take one hand and squeeze the chain (grab the chain above and below the swingarm) at the point between the axle and the swingarm bolt.. as hard as possible. to take all the slack out of the chain and put the tension completely around the back sprocket.. while you are squeezing the chain as hard and tight as possible.. - with your other hand - try to lift/pull the chain off the rear sprocket.. IF you can pull the chain off enough to see if there is a .200" or 5mm max. gap between the chain and sprocket - under the chain... or MORE THAN A HALF a tooth groove under the chain..or the chain pulls up more than two teeth...OR the teeth on either sprocket are "pointed thin" or rounded inside....you need to replace the chain/sprockets.
...ONCE you are sure the chain/sprockets are good..its time to CORRECTLY align and adjust the chain tension. Loosen the axle nut.. DO NOT remove it.. now - tap it gently to make sure its loose...loose the chain adjuster nuts.. back them off a good bit, but do not remove them...you may,also need to loose the rear brake caliper mounts ..you should be able to move the rear wheel forward and backward with your hand.(this is to assure you have sufficient "looseness" to make the proper adjustment...NOW - pull the rear tire backwards until it stops.. - run the adjuster nut(s) until they are just snug..ALIGNMENT - This is CRITICAL - (did you remove the chain guard yet?) - do that now. You must be able to see down the entire length of the chain (above the swingarm)..The chain MUST RUN IN A STRAIGHT LINE!! .. The little marks on the swingarm are just "guides".. never use them as perfect.. the only way to assure CORRECT ALIGNMENT is a visual check of the chain to make sure its in a straight line!!!! - ...ANY bend, crook, or mis-alignment will cause premature wear and tear, and make it harder for your engine to make it turn. - Now - Rotate the wheel and find the tightest point of the chain... there is one, and its normal... LEAVE the tight point located between the two sprockets on the top of the swingarm. This is where you will "feel" for the correct tension.
The biggest thing most people miss when adjusting the tension is having the AXEL/NUT and the SWINGARM PIVOT SHAFT and the COUNTERSHAFT C/L (front sprocket shaft) IN A STRAIGHT LINE - ALL THREE ARE ON THE SAME PLANE!!!!!
. NOW, You may have to get a buddy to help pull the swing arm up.. (I use a tie down strap through the rear wheel and over the seat pulled tight enough to make AND KEEP the STRAIGHT LINE!!)
..Once you have established the straight line - --- - --- - and MADE SURE the chain is RUNNING STRAIGHT on both sprockets.. NOW _ its time to adjust the tension. There WILL be a tightest and loosest point of the chain..(normal).. you MUST adjust the tension using the TIGHTEST point of the chain....set the tension so you can move the chain up and down (total movement) about 1 3/8 inch to a max of 2 inches!! Once you have established the chain is straight and the tension is correct, its time to TIGHTEN EVERYTHING in order... start with snugging the axle nut.. then snug the adjuster nuts more..-- DOUBLE CHECK you chain alignment.. now - tighten the axle - TIGHT!!... tighten the adjuster nuts..lock down the lock nuts.. tighten the caliper.. TRIPLE CHECK the alignment... double check the tension...double check all the nuts... install the chain guard... REMOVE whatever you use the keep the straight line straight..
TRIPLE CHECK ALL NUTS!!! NOW ROTATE THE REAR WHEEL AND CHECK FOR BINDING AND MAKE SURE THE CHAIN IS WORKING CORRECTLY AND NOT TOO LOOSE..
KNOW you have done a job correctly!! (I am a factory trained mechanic, race engine builder, port work guy, race tuner.)..
Posted on Aug 09, 2017
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Posted on Jan 02, 2017
Loosen the Axel castle nut on the Axel and there is a bolt with a nut out the back of the swing arm. Turn the nut in the same amount on both side till the chain has 1/2 inch of movement up and down and tighten the Axel nut to 80 ft pounds.
Posted on Oct 01, 2009
Plenty of info available on the above.
This is a members forum's description of resetting timing chain, but I had trouble with pop-ups (I have them blocked)
Posted on May 02, 2010
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