Archive for December 2011

XS650: 70 XS1 Wiring Diagram   Leave a comment


70 XS1 Wiring

70 XS1 Wiring


70 XS1 Wiring Diagram

Double click diagram to enlarge.

Posted December 31, 2011 by xscafe in Elec - diagram

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XS650: Happy New Year … 2012   Leave a comment

Another year sucks a kumara. 2011 has come and gone. And the Mayans reckon the Northern Winter Solstice, Dec 21 2012 will herald the end of an age. Personally I say ‘Bring it on’. The power broking in today’s world leaves me cold.

None-the-less I look forward to the coming year. My 5 yo will go to school end of summer. My project is to build a sidecar outfit for the 650. School transport. Am currently looking for a suitable body.

As far as the bike is concerned this year’s main achievement has been a hydraulic clutch. There have been other minor highs and no major lows. Am also looking at having a rear wheel modified for rubber dampers, something Yamaha should really have done themselves. Should be ready for Easter. Add a front drum brake and new tyres. French Alps here I come.

Have been pretty surprised with this blog. Been active for a year now. Had over 55,500 visits. I thank all readers, regular and ocassional visitors alike, for your comments and feedback.

Wishing you all a ‘Guten Rutsch ins Neues Jahr’, ‘Happy New Year’. May good karma and twisty roads feature heavily.

Posted December 31, 2011 by xscafe in Uncategorized

XS650: VM34SC Mikuni   Leave a comment

Yamaha’s Racing Tips Manual, 1974, suggested using VM34SC Mikunis. Round slide. Magnesium bodied. No Power Jet/Accelerator Pump/Beschleunigungspumpe.

Today, TM’s are supposed to provide significant performance improvements. Flat slides and the jet blocks help create a smooth bore effect. Air flows faster and smoother through the TM Series venturi. Higher air flow velocity gives a stronger vacuum at the needle jet needle. Provides more precise metering and better throttle response.

For known geographic and climatic conditions.

However, I do a fair bit of touring. Low to High altitude. For this I actually prefer the original BS series carbs. They automatically adjust themselves for air pressure. Easier to keep tuned.

… VM34SC carb … XS750(650) Racing … adjustments … jet needle 6F9 (#2 clip position)


… carb adjustments


… carb .. VM34SC … adjustment


… VM34SC carb … 3/4-full throttle adj … main jet



… VM34SC carb … 1/4-3/4 throttle adj … needle jet


… VM34SC carb … 1/8 – 1/2 throttle adj … slide adj and cutaway



… VM34SC carb … 0-1/8 throttle adj … air mixture screw – pilot jet



… VM34SC carb … idle speed screw

Posted December 21, 2011 by xscafe in Carb - VM

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XS650: Con Rods   Leave a comment


This is from the Yamaha Racing Tips Manual.

1 .. 447 rods came slotted from factory ... 533 rods didn't - Heiden sells them now

447 rods came slotted from factory … 533 rods didn’t – Heiden sells them now


2 .. interesting about the bearings

interesting about the bearings



256 cranks … 135mm rod … XS1, XS1B, XS2, TX650 … 22mm piston hole … 26mm crank pin

447 cranks … 130mm rod … TXA on, US and 447 Euro motors … 20mm piston hole … 26mm crank pin

533 cranks … 140mm rod … European 533 motors … 20mm piston hole, scooped crank pin 29mm

Posted December 19, 2011 by xscafe in Motor - Crank

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XS650: Buying Heads or How to Throw Away Your Cash   Leave a comment

Our beloved XS650s have become pretty popular these last few years. They look good. Sound great. Ride well. Classics.

This has driven prices up. And created a market hungry for parts. A market of often inexperienced buyers. Unfamiliar with these machines. Unfamiliar with their idiosyncracies.

Slowly, backyard and enthusiast businesses are beginning to cater for this market. See for example, the Australian XS650 Club here, and JBM Industries. One of the main reasons I started this blog was to promote such endeavours. I have personal experience using most of what you find written about here. The other reason was to provide options to those useless crap new parts as sold by the supplier whose name rarely passes my lips.

Ebay has also provided a ready venue for bike dismantlers (often these bikes are worth a lot more as used parts than as complete machines). Many of these online sellers are straight-up. Others NOT.

One of my pet hates are assholes that sell Heads and Rocker Covers as separate items. If you buy these you are literally wasting your cash. You would do better going downtown and buying some homeless person a meal. Karma rules!

You need to be aware that Heads and Rocker Covers were machined by Yamaha as a matching pair. And stamped with matching numbers.


1 .. matching numbers ... 6198 ... found behind the oil feed pipe

matching numbers … 6198 … found behind the oil feed pipe



2 ..mismatched cam bearing mount

mismatched cam bearing mount



3 .. mismatched numbers ... J1954/9450

mismatched numbers … J1954/9450



4 .. surfaces dont match

surfaces dont match 



5 .. valve inspection port misalignment

valve inspection port misalignment



6 .. single head ... €85 wasted ... and no cam

single head … €85 wasted … and no cam



7 .. single rocker cover ... $72.99 thrown down the toilet ... at least it has the rockers and inspection covers

single rocker cover … $72.99 thrown down the toilet … at least it has the rockers and inspection covers


These sellers know very well that these should be sold as matching sets. How do I know? I have made it a point to let them know. Does it make a difference? Obviously not!

The current Ebay Hall of Shame:

Took me 5 minutes to find these ………

  • thebikebarn … head only, valves and springs, no cam … £60 wasted
  • Impala66k … cover only, no rockers etc … $72.99 blown
  • Impala66k … head only, valves, springs, no cam … $149.99 down the toilet
  • wilto54 … head only, no cam … $125 you may as well have given to a thieving banker
  • independent-cycle … cover only, rockers … C$44.95 don’t you need snow boots?
  • elkhntr6x6 … head only, no cam … $99.95 you should have given to the homeless
  • juan.fernandez … head only, valves, springs, no cam … $99.95 throw a party instead
  • motorcyclesalvation … cover only, no rockers etc … $25.49 you should have spent on new oil
  • bigfootedalien … XS2 cover only, rockers etc … $100 ??wtf??
  • bigfootedalien … cover only, rockers … $57 your ex could have done with
  • bigfootedalien … head only, springs, valves, no cam … $95 do you need a tyre?
  • thecyclebarn1 … head only, no cam … $79.99 worth of BC Buds you missed out on
  • thecyclebarn1 … cover only … $49.99 you paid for scrap metal
  • yourtrashmytreasure … head only, springs, valves, no cam … $195.99 better spent at a brothel
  • yourtrashmytreasure … cover only, rockers … $79.99 worth of condom insurance

Be aware that Engine Cases are likewise machined as a pair. And also stamped.


8 .. matching case numbers ... 3062 ... found behind the clutch pack

matching case numbers … 3062 … found behind the clutch pack



9 .. look here ... 9426

look here … 9426



Photos from Terry, Australian XS650 Club.

Posted December 16, 2011 by xscafe in Motor - Cases, Motor - Head

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XS650: SR500 Rear Wheel Bearing Spacer   Leave a comment

I need one. A bearing spacer. Rear wheel. SR500. Drum brake.

Goes inside the hub. Between the bearings.

If anyone has a spare one handy please drop me a line – reply below.

Seems the drum and disc brake versions are different:




Drum Brake (spoke/mag)



Disc Brake    (mag)





drum brake rear wheel bearing spacer (XS650)

drum brake rear wheel bearing spacer (XS650)



This is from an XS650, but you get the idea.

Thanxs …

Rear Wheel Bearing Spacer


mag/spoke: drum  #275-25317-00


mag/spoke: drum #90560-20135










Ring OD:



Posted December 7, 2011 by xscafe in Frame - Wheels, SR500

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