sprocket size question...

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I've reassembled my primary with .020" less clutch stack height, by swapping 2 plates at .080" thickness for 2 plates at .070". The lever is noticably heavier, but only heavy in comparison to how it was set up previously, which was very light. It makes sense that the trade off for more clamping force is a slightly heavier lever. I washed my clutch pack with brakeclean, and sanded the steel plates to rough them up, so I should be good to go. The plates I took out looked too smooth to me, so I am sure they were slipping a lot. The 2 new plates I got from old britts, were noticably rougher than my existing plates.

bluto, that website is phenominal. thanks again for your help and comments

Maylar, thanks! I thought over using just one or both of the thinner steel clutch plates. I decided to just use both and knock .020" off my stack and see if that's enough to do the trick. Thanks for your comments.

Today, I remembered that I have an old handheld GPS which measures speed. I used in the truck, on the ride home from work today, so I am going to tape it to the bike where I can see it when I take my test runs so I can compare my speed and my RPM's.
 
AND SO,..... I repacked my clutch plates less .020" and took the bike out for a ride. I had my GPS strapped to the inside of the fairing where I could see it. At 70mph on the GPS, I was reading 5100 rpms. That's 1100 rpm's more than the chart predicted, so I have to assume that the tachometer is way off.

As far as a slipping clutch is concerned, after hearing people say that you would definately notice it if you clutch was slipping, added to the experience of my test ride today after cleaning and reducing the height of my clutch plates, I have to conclude that my clutch was probably not slipping previously. I'm thinking that my issue is a poorly calibrated tachometer. (which has probably kept me from over-revving and blowing up my engine... 8) )

I assume I can send my tach somewhere to be tested and recalibrated... I'll have to search that info out... Thank you everyone for sharing your wisdom....
 
If it were possible to put a bigger sprocket on the crankshaft that would be the best option. It would then put slightly less strain on the gearbox and you could up the size of your rear sprocket to compensate. You cant really put a smaller sprocket on pre mark III's, and I am not aware of a smaller rear sprocket available for the mk III. [ dont need to know because all my bikes have the gear change on the correct side.

Dereck
 
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