1980 KZ200 Street Tracker/Scrambler
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Re: 1980 KZ200 Street Tracker/Scrambler
02 Nov 2016 07:00BrianF wrote:TexasKZ wrote: Very nice. How does it run? Is there enough clearance between the rear tire and its fender for full suspension travel?
Had some trouble getting the jetting right but it's running well now. There's plenty of suspension travel clearance for me but I'm pretty light. There's not much clearance at the front edge of the swing arm, had to go down 1 tooth on the front sprocket and fit a longer chain to get the wheel as far back in the chain adjusters as possible.
What was the issue with the chain? Having been around/modified some vintage MX bikes whenever you add more rear suspension travel you usually need to add slack to the chain and fab up some sort of chain guide/roller system. Here's one I made up for a 76 KX125 after adding 1" of travel. With the bike on a stand and the shocks removed you need to operate the swingarm to find the point where the chain is tightest. Hold the wheel at that position and adjust the chain so there's a little slack. Reinstall the shocks and see where you're at. You may get away with just a roller or two or need a guide and slider as well.
1975 Z1 900
1994 KX250 Supermoto
2004 KX125
1994 KX250 Supermoto
2004 KX125
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Re: 1980 KZ200 Street Tracker/Scrambler
02 Nov 2016 11:08Kidkawie wrote:BrianF wrote:TexasKZ wrote: Very nice. How does it run? Is there enough clearance between the rear tire and its fender for full suspension travel?
Had some trouble getting the jetting right but it's running well now. There's plenty of suspension travel clearance for me but I'm pretty light. There's not much clearance at the front edge of the swing arm, had to go down 1 tooth on the front sprocket and fit a longer chain to get the wheel as far back in the chain adjusters as possible.
What was the issue with the chain? Having been around/modified some vintage MX bikes whenever you add more rear suspension travel you usually need to add slack to the chain and fab up some sort of chain guide/roller system. Here's one I made up for a 76 KX125 after adding 1" of travel. With the bike on a stand and the shocks removed you need to operate the swingarm to find the point where the chain is tightest. Hold the wheel at that position and adjust the chain so there's a little slack. Reinstall the shocks and see where you're at. You may get away with just a roller or two or need a guide and slider as well.
I just needed to get the rear wheel as far back as possible to allow the oversize tyre to clear the swingarm. I also shaved a bit off the side of the rear tyre by putting the bike in first gear at fast idle on a paddock stand then held a surform wood rasp on the edge of the tyre.
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