Knob under carbs?

[Anonymous]

Hi, I have one thing I just cant stand not knowing what it is. There is a about 1 1/4 inch diameter black knob connected to the engine, under the carbs, I'm going to guess its a cam chain tensioner?? because it will rattle hardcore it I lossen it a tad while running, then shuts up when I tighten it a little. But it rattles itself loose in no time while running so its like always rattling a little. Any info would be greatly appreciated. thanks-darren

[QuaiChangKane]

It's an automatic cam chain tensioner.

Don't adjust it - get a manual. Take it apart, clean and rebuild it, and put it back together.


You shouldn't have to adjust it at all if it's working properly. If it's not, bad things can happen....

[SqDancerLynn1]

cut & paste

With the tensioner removed from the cylinder block loosen the lock nut on the left side of the tensioner and back the slotted bolt out ? turn. Turn the knob on the right side of the tensioner, which in the Suzuki service manual is called a lock shaft handle, counterclock-wise. As you are turning the knob counterclock-wise push the pushrod all the way back. Keep turning the knob until it refuses to turn any further. With the pushrod still pushed in as far as it will go tighten the slotted bolt so that the pushrod will not plunge out. Remount the tensioner to the cylinder block. If the tensioner is not going in turn the crankshaft clockwise slowly to get slack in the cam chain on the intake side of the block. Loosen the slotted bolt ? turn allowing the pushrod to advance towards the cam chain. Tighten the lock nut but leave the slotted bolt loose by that ? turn. While turning the knob counterclock-wise, slowly rotate the crankshaft in reverse direction, counterclock-wise. This causes the chain to push the pushrod back. Release the knob and slowly turn the crankshaft in the normal direction, clockwise. You should see the knob rotate as the chain becomes progressively slackened. If it does the pushrod is obviously moving forward under spring pressure signifying the tensioner is in good operable condition. If it moves sluggishly or not at all that means the pushrod or the slotted bolt is sticking. If so remove the tensioner from the block again and inspect the pushrod. It could need cleaning or could be bent or galled. Further crank rotation will take the slack out of the cam chain

[bwringer]

Here's my illustrated cam chain tensioner rebuild:

http://bwringer.com/gs/camchaintens.html

This was on my GS850, so the parts are probably slightly different. But the principles are the same.

[Anonymous]

thanks guys, where would I be w/o this site, and I've only been to the site like 20 times so far.-darren

[Poot]

You might as well order the gasket, and at least the small o-ring listed on ringers site.....mine was completely baked!