will a TX750 swing arm be a straight fit into my '78 frame? Cheers, Raymond
Does the TX use the same brake pivot and brake arm as the later XS? If so, why no clearance concerns?Yes, the clearance is very close, but on the couple I've done, it fit. Tough to get a proper angle pic, the clearance is actually a bit more than what you see here, and it increases as the swingarm moves up when the shocks get compressed .....
You do need to flip the anchor pin for the brake rod around. Put the thin head on the inside, cotter pin end facing outwards .....
If you did have a clearance problem, it would be pretty easy to just bend the bracket on the pivot out a little bit at the top where the brake rod attaches.
Thank you 5T - that's exactly the sort of thing I needed to know. Will go and have a look at my swing-arm and have a wee think.The TX750 swingarm is a drum brake arm. Your SE model has a disc so some modding will be needed. The drum brake torque arm attaches to the bottom of the swingarm. The disc caliper torque arm attaches to the top. A bracket would need to be added for it.
Oh, I'm sure there are many, lol. I just really get into and research the mods I do do. All this TX750 stuff I stumbled upon quite by accident. A buddy gave me a TX750 rolling chassis. He was moving out of state and didn't want to haul the thing with him. He had purchased it as part of a complete bike but just for the engine really. He was fixing up his dad's 750 and needed an engine (crank). I took it for the wheels mostly. They are the flanged alloy type like the 650 uses. Closer inspection revealed other useful items like the swingarm.
Sometime in the distant past past I got the notion that there was an engineering convention to assign half the weight of parts like swingarms and chainguards that connect unsprung to sprung vehicle components to each category; i.e., of the 2 lb difference in the swingarm, only 1 would be added unsprung weight. Anyone else confirm or correct me?5twins, I took your advice and mounted a TX750 swing arm awhile ago. It made quite an improvement. The TX750 arm is 2 lbs. heavier than the stock XS650 unit, but a hollow rear axle, modified plastic chain guard (from the salvage stash at the local independent shop, no idea what it went on originally), drilled chain adjuster stops, and a few titanium fasteners keep the unsprung weight at a healthy level. Thanks for the tip.
So does this mean the pivot arm rotates more up and down, vs front to back?Studying some TX750 parts diagrams pretty much explains the brake light switch set-up. It didn't mount behind the pedal pivot and connect to it. It mounted above the pedal and connected to it instead .....
https://www.partzilla.com/catalog/yamaha/motorcycle/1974/tx750a/stand-footrest-brake-pedal
https://www.partzilla.com/catalog/yamaha/motorcycle/1974/tx750a/electrical-2