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    1980 XS400 Wont rev out past 4k

    Hello! I've got a 1980 xs400 that I'm almost done with but I took it for its maiden voyage today and it won't rev past like 4000 rpm. Carbs are clean using stock jetting and air boxes with new filters and everything. I'm wondering if it's not an ignition issue. It seems to only have trouble...
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    Did i just ruin this swing arm? 1980 Yamaha XS400

    Hey guys, I'm building a scrambler out of an XS400. Almost done but the rear tire (5.10 x 18) was rubbing the inside of the swing arm. Initially it looked like just some of the weld was all that needed to be removed. No luck. So I kept shaving away till I got the clearance I was looking for. I...
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    1980 XS400 Chain Rubbing

    Hey guys! I've got a 1980 XS400 that I'm almost done building for my brother. This thing was the perfect candidate for a scrambler build so that's exactly what I did. DOT knobbies, 15 in rear shocks, xs360 front spoke/disc rim, single 2into1 exhaust, all that. Looks good and runs good, but...
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    Carburetors shooting flames!

    Hey guys! So I've got a 1980 XS400 that I got as a complete project. It needed a new timing chain, piston rings, rocker arm, and head cover. I tore it all the way down and completely rebuilt the motor and it's looking great. Also, the wiring harness was beyond messed up. The previous owner just...
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