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  1. 79XStLouis

    Brake Master Cylinder Reservoir O-Ring

    Hello all, I have not posted in a long while. I have two questions for the right persons. 1) I have an 79 XS 750 Special...not 650. Does the 650 and 750 use the same front brake master master cylinder? They look identical. 2) Does anyone have the precise O- Ring size for the reservoir cup to the...
  2. 79XStLouis

    For Sale - Handlebar Riser/Pullback

    An obscure Yamaha accessory I don't need...this handlebar fitting raises the bars 1.5" and pulls them back 1.5". Uses your existing top caps and hardware with the exception of the included long cap bolts. $15.00 plus shipping.
  3. 79XStLouis

    For Sale - 1979 XS650 Special

    I am considering selling my 79 XS Special, and will be taking it to the North Carolina rally as well as to Barber Vintage Fest directly afterward, if you want to see it. If anyone is interested I will bring the title and paperwork along. This is a low miles unmolested orignal in perfect working...
  4. 79XStLouis

    Rear Ended on the XS

    Was waiting at a traffic light to turn left, then boom, hit from behind. Luckily I stayed on the bike and held on. Turned around to see an Asian lady staring at me. Her bumper was right up to the tail light. You get one guess what she was doing instead of driving... yep, screwing with her her...
  5. 79XStLouis

    Extra ZDDP additive... yes or no?

    I have bottles of pure ZDDP additive that I used to add to my vintage cars. Doing an oil and filter change now, should I add some of this ZDDP concentrate additive to my 10/40 oil? If so, how much ZDDP would be appropriate in the crankcase? Thank you.
  6. 79XStLouis

    Fuel Petcock Deduction...Sound Right?

    So I completely rebuilt both vacuum operated petcocks on the 79 SF Special. The one on the left trickles fuel out the end in the 'on' and 'reserve' positions. I was meticulous with the rebuild and have come to a theory.the inner spring must be weak. If I disconnect the vacuum line to the intake...
  7. 79XStLouis

    Fuel Petcock Deduction...Sound Right?

    So I completely rebuilt both vacuum operated petcocks on the 79 SF Special. The one on the left trickles fuel out the end in the 'on' and 'reserve'get the positions. I was meticulous with the rebuild and have come to a theory.The inner spring must be weak. If I disconnect the vacuum line to the...
  8. 79XStLouis

    Were two mirrors optional?!

    I just restored an unmolested 79 Special. It only had one mirror on the left handlebar, and a factory rubber plug in the right side hole fitting. Was two mirrors an option back in the day? Seems crazy considering the safety factor. I have since bought a salvage mirror to replace the missing...
  9. 79XStLouis

    Dim glowing headlight warning light

    I have a 79 model. I noticed tonight in the dark that the headlight failure light on the vertical instrument panel was glowing very dimly. Any thoughts on why this is happening? There is no issue with the headlight, so should I disregard this as some low level parasitic draw or try to correct...
  10. 79XStLouis

    Sinking Float?

    So I did a full restoration on my 79 XS, and it was running absolutely great for a few days. Soon it didn't want to idle without goosing the throttle. When I rebuilt the carbs, both sets of floats had pin holes which I carefully soldered up, but the brass was frail overall, so now I suspect one...
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