"...xs650 regardless of year..."

Discussion in 'WERA Vintage' started by Yama-saurus, Jun 22, 2004.

  1. Yama-saurus

    Yama-saurus Bigger..Stronger..Faster

    i recently aquired a 1973 tx650 (xs650) and started to strip it to race.the frame,tank, rims and engine seem to be good so i halted to poder restoration.monday rolls around and i happen upon a 1982 xs650 special.aside from the wheel sizes and tank differences, i see not alot of change.
    the rule book states that any model xs650 can run v3.so here is mt issue..fix the 73 and race the 82 or fix the 82 and race the 73.not a big deal, but a crossroad that i am parked at.
    :D :confused:
     
  2. Diesel

    Diesel Well-Known Member

    The '73 frame should be lighter since I think it was for the 1974 model year that Yamaha began using thicker wall tubing. They did this because of fame flexing and cracking problems of the earlier frames. So your choice is to either use the lighter frame, brace the hell out of it but still expect cracks and replace the earlier short swingarm with the more responsive longer SA of the later year models... or use the heavier '82 frame which only needs to be braced in one spot just below the swingarm and already has the better swingarm fitted. My bike originally had an '82 frame and swingarm which worked great and was worry free.

    Whatever your frame choice you will have to use the spoked wheels from the '73 (I'm assuming the '82 has cast wheels).

    As for the front end, in my opinion the dampening rods of the '73 34mm forks function better than that of any of the later years 35mm forks, but they are spindlier. If you can, get a set of FZR600 forks which are infinitely better and fit the frame with no modifications necessary although you will have to use tapered head bearingsa which is a must anyway.

    Also, no matter what swingarm you decide to use another necessity is replacing the stock "plastic" bushings with aftermarket bronze bushings. Check out http://www.mikesxs.com for great prices on parts.
     
  3. Yama-saurus

    Yama-saurus Bigger..Stronger..Faster

    thanks diesel.i may have been too vague in my question.the wheels actually have "double" spokes in each direction front and rear with the front being 19" and the rear being 16".is there any advantage on any rear size over the other (16" from the 82 vs 18" from the 73)? also,there is a set of fzr forks at the shop being cleaned,re sealed,emulated and springed(?) for duty per a prior pm from you. i also have found a couple of posts from you regarding other xs' that have been of great help.
    many thaks again:up:
     
  4. Diesel

    Diesel Well-Known Member


    Sorry mang, I tend to repeat myself, sorry mang.
     
  5. Diesel

    Diesel Well-Known Member

    Oh... about the wheels... keep the "custom" spoked wheels for the street bike or you may even consider selling them. There are a lot of XS650 owners who love to hardtail and chop these bikes and they drool over the double spoked wheels. You'll be able to get better race rubber for 18" rear rims... such as the AVON 130/650-18.
     
  6. Yama-saurus

    Yama-saurus Bigger..Stronger..Faster

    tin fur on the advice.16's out 18's in.i found a couple of decent rims today actually from a guy who went cast and they only need some tlc.so off to work i go to try to make at least a couple of rounds this year.if not,we'll be rocking in 05.
    thanks again:D
     

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