Crankshaft sprocket must align with trans. sprocket, clutch outboard of that = barely measureable width difference. I don't see that the Knuck clutch in the photos is any narrower than my 1968 1 1/2" belt driven,5 stud clutch is. It's probably just me, but I think you are chasing something that isn't worthwhile.
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I measured on the motorcycle: Between crankcase and front belt sprocket is almost 2 inches of space. Then the sprocket is the same width as belt = 3 inches, and then from the belt to the end of the nut on the clutch is another 2 inches. If i squeeze front sprocket completely to the crankcase, leave 0.25" of space, it's 1.75" narrower. If I use 1.5" belt, I get another 1.5". If I manage to squeeze the clutch completely under the belt, I would gain another 2", but let's say I use 2002 sportster clutch: Total width of the clutch is 2.5", which means it would stick out of the belt for 1".
At the moment on the motorcycle the width measured from the Crankcase to the top of the nut of the clutch is: 2+3+2= 7 inch
My plan: 0.25 + 1.5+ 1= 3.75 inch.
That is almost half.
It would be even better to shave that inch off. So the width of the whole primary would be just the width of the belt, squeezed to the crankcase.
I understand, that moving the pulley (and belt), towards the crankcase, I will have to move transmission for the same amount (1.75") more to the right side. And then I would have to install a narrower rear wheel (Same as Newman did.) Otherwise rear chain would not fit.
And that will make a kickstarter stick out on the right side even more. That is why I want to remove it. Newman had reworked the kickstarter, but I just want to remove it, and keep electric starter. I need to find a replacement kicker cover, that has just the clutch mechanism or make it myself.
I would also consider replacing for right side drive transmission (So that I could keep current tires), but they are all 6 speed, so I doubt it would be any narrower.
The idea is that everything is only as wide (or narrower) as the engine crankcase. On both sides. Of course that is not possible, because it needs a primary drive, but as close I can get to that, the better.
This, at least, is the plan at the moment.
I am still looking for the splined shaft for 4 speed.
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At the moment on the motorcycle the width measured from the Crankcase to the top of the nut of the clutch is: 2+3+2= 7 inch
My plan: 0.25 + 1.5+ 1= 3.75 inch.
That is almost half.
It would be even better to shave that inch off. So the width of the whole primary would be just the width of the belt, squeezed to the crankcase.
I understand, that moving the pulley (and belt), towards the crankcase, I will have to move transmission for the same amount (1.75") more to the right side. And then I would have to install a narrower rear wheel (Same as Newman did.) Otherwise rear chain would not fit.
And that will make a kickstarter stick out on the right side even more. That is why I want to remove it. Newman had reworked the kickstarter, but I just want to remove it, and keep electric starter. I need to find a replacement kicker cover, that has just the clutch mechanism or make it myself.
I would also consider replacing for right side drive transmission (So that I could keep current tires), but they are all 6 speed, so I doubt it would be any narrower.
The idea is that everything is only as wide (or narrower) as the engine crankcase. On both sides. Of course that is not possible, because it needs a primary drive, but as close I can get to that, the better.
This, at least, is the plan at the moment.
I am still looking for the splined shaft for 4 speed.
1 - 3 of 3 Posts
