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Sportster Motorcycle Transmission, Clutch, Primary & Secondary Drive Transmission, Clutch and primary or secondary drive problems, advice, and/or how tos.

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  #1  
Old 3rd May 2021
Wiktor Wiktor is offline
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Default Barnett Clutch Adjustment Question?

Hi All! I just put a Barnett extra plate clutch in my 09 XL1200C. My question is, the instructions that came with it say to back the clutch adjustment screw out 1/2 turn while the Harley manual calls for 1/4 turn. Which should I go with?
Thanks!
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Old 3rd May 2021
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Back it out ?
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Old 6 Days Ago
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I assume that is the back off from contact as you adjust the free play (gap) at the throw out bearing.

So, I personally like to back out that screw a bit more than the factory spec 1/4 turn anyway, because it's not critical except backing it out too little can cause the natural wear of the plates to eliminate that gap sooner than if it's backed out a little extra. That said, 1/2 turn seems a bit excessive, in that it leaves the lever on the ramp at a different angle than intended, which in turn makes it operate at a different part of it's throw. Normally it works on both sides of center and having the adjustment favoring one side puts it more to one side of center as the ramp is rotated.

The up side to any extra gap left from that adjustment is that you can take any extra out with the cable adjustment, and the cable adjustment will continue to allow you to readjust for a longer period before plate wear cuts that gap to nothing (and from that point, as more wear happens the plates will be held open and the clutch will slip and the cable will not be able to fix it) That is when you need to readjust that screw.

So..... As you do this, pay attention to the position of the lever on the ramp. It functions best when it pulls from (looking straight at it) the right side of the ramp equally distant to the left side of the ramp. If it starts the pull as the lever is pointing near straight down, it will be pulling way to the left at full throw and at that point it really can't pull further because it is pointing directly at the cable that operates it so that limits the total throw.

Maybe I am explaining too much but I am trying to be sure you see the action in your mind and if you do, you will never have an issue with clutch adjustment because you will see the issue.

A good thing to note right now is that normal clutch wear of the plates always results in slip. The cable can adjust that slip out until that gap that you create with the adjusting screw goes away, then you need to adjust the screw. Normal wear NEVER creates grab. If it is grabbing, you have a mechanical issue not wear. Bad throwout bearings cause grab as they wear and get sloppy, the old grenade plate will cause grab as it breaks apart, a frayed cable can cause grab as it stretches. All mechanical issues. Wear causes slip only.

I would say if 1/2 turn works as far as the lever position goes, then it's better than 1/4 turn, in that it allows for prolonged future adjustment as the plates wear. In other words, the cable adjustment takes out any extra gap you put in there.

Always back the cable off completely before adjusting the screw or that cable will hold back the lever and not allow you to get to the proper far right position. As you adjust the cable (after adjusting the screw) you can see the cable pulling that lever to the left to narrow the gap that you put in there.
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Not Buell related; moving form 'Buell Transmission, Clutch, … etc' to Sportster.
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