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Author Topic: 1975 Yamaha XS500B  (Read 9162 times)

Offline Royal

  • Posts: 18
    • My Blog
1975 Yamaha XS500B
« on: Aug 16, 2010, 23:09:42 »
First I'd like to give  a shout out to SrgtBear and JRK5892.  I've read both your builds and I've learned a lot.

This is my first cafe racer.  Here is the bike as it sits right now:



I've never had it running well.  I recently rebuilt the carbs and it made no difference.  I hate these Keihin carbs and I hate the points system.  I've found a carb solution but it looks like I'm stuck with the points for now.



Anyway, when rebuilding my carbs I noticed some pretty significant pitting in the right carb:





This is my plan for the bike:

1) Replace CV carbs with Mikuni VM32 featuring UNI pods.  Delete the airbox
2) Complete tune up including new coils, plugs, wire, adjusted points new advance unit springs, valve adjustment and timing.
3) Figure out how I adjust the cam chain tension.
4) Replace the breather tube from the engine to my chain with a pod filter.
5) Delete headlight mount and replace with ears from Mikes or similar and add clip ons to fork tubes
6) Replace forks with 35mm units or rebuild 34mm units and add roller bearings to steering stem
7) Delete passenger peg mounts on frame.
8) Relocate battery and wiring and delete side cover mounts
9) Rebuild or polish rims depending on results of initial polish.
10) Delete electric start and all related components moving to kick only.
11) New chain and sprockets
12) New subframe bushings

I'm sure there's a few things I'm missing but you get the idea and I'll do my best to document the project as it moves along.

Cheers,

R
« Last Edit: Aug 16, 2010, 23:12:12 by Royal »

Offline SrgtBear

  • Posts: 840
  • The arsenic has oddly shaped feet...
Re: 1975 Yamaha XS500B
« Reply #1 on: Aug 17, 2010, 16:33:27 »
Nice man!  Thanks for the shout out.  You know, that bike doesn't look to shabby as-is.  I'll be real interested to see how your carb situation turns out.  I haven't had the chance to play with mine yet but I replaced all the seals.  There is alot when it comes to the battery and it's components.  I thought about moving it myself but the stock battery is huge and there is alot of components with it.  I am really excited to see what you do here. 

Welcome to the club.  :D
Ted

Kawasaki Kaiju (怪獣) - 79 KZ650 - 700cc Bore Cam Rocket - http://www.dotheton.com/forum/index.php?topic=39748.0
75 Yamaha XS500B Cafe - Completed - http://www.dotheton.com/forum/index.php?topic=14392.0
74 Honda XL 125 - Original - http://www.dotheton.com/forum/index.php?topic=25706.0

Offline LeVeL

  • Posts: 8
Re: 1975 Yamaha XS500B
« Reply #2 on: Aug 17, 2010, 18:25:03 »
I've never used a hammer to rebuild my carbs... maybe thats why mine don't work right?? lol. JK. Looks like a very solid starting point. Hopefully it will get going for ya

Offline Royal

  • Posts: 18
    • My Blog
Re: 1975 Yamaha XS500B
« Reply #3 on: Aug 17, 2010, 21:24:33 »
Nice man!  Thanks for the shout out.  You know, that bike doesn't look to shabby as-is.  I'll be real interested to see how your carb situation turns out.  I haven't had the chance to play with mine yet but I replaced all the seals.  There is alot when it comes to the battery and it's components.  I thought about moving it myself but the stock battery is huge and there is alot of components with it.  I am really excited to see what you do here. 

Welcome to the club.  :D

Thanks! Trust me it's a real 20 footer as it stands.  Its had lots done though and the frame is already powder coated in black.

 These carbs suck, trust me.  I've done a lot of reading and nobody has anything good to say about the CV card.  They're vacuum based so any issues with manifold pressure will cause problems.  Factor in the witchcraft of points and weak ass factory coils and you have a tunning nightmare.  Plus mine are pitted.  Anyway, I replaced all the jets and put new seals in plus I soda blasted them and used carb cleaner and my bike is still running like a pig. The only thing I haven't tried is using an ultrasonic cleaner.  However, I want to run pods and you can't tune CV carbs to run on pods (so I've read) so I am upgrading to the VM style.

I have a battery solution for you and it's small.  Check this out:



http://www.gixxer.com/forums/showthread.php?t=263678

That battery will start and run an SV1000 and it's amazing.  I'm going to run the 4 cell version (1/2 the size) as I will be going down to kick start only.  Anyway, the eight cell should fit into your cafe hump or a small custom battery box without a problem.

Quote
I've never used a hammer to rebuild my carbs... maybe thats why mine don't work right?? lol. JK. Looks like a very solid starting point. Hopefully it will get going for ya

Haha, I know, I had a bitch of a time with these carbs so I brought the hammer out to make them listen! ;)
« Last Edit: Aug 17, 2010, 21:27:25 by Royal »

Offline SrgtBear

  • Posts: 840
  • The arsenic has oddly shaped feet...
Re: 1975 Yamaha XS500B
« Reply #4 on: Aug 18, 2010, 19:11:10 »
Pretty cool stuff.  Checked out the link, pretty pricey batteries too.  I'll definitely look into that once this stock one hits the dust.  You can show me how yours works first.  :)
Ted

Kawasaki Kaiju (怪獣) - 79 KZ650 - 700cc Bore Cam Rocket - http://www.dotheton.com/forum/index.php?topic=39748.0
75 Yamaha XS500B Cafe - Completed - http://www.dotheton.com/forum/index.php?topic=14392.0
74 Honda XL 125 - Original - http://www.dotheton.com/forum/index.php?topic=25706.0

Offline Royal

  • Posts: 18
    • My Blog
Re: 1975 Yamaha XS500B
« Reply #5 on: Sep 20, 2010, 20:54:16 »
My mom likes to remind me that I've always been better at taking things apart than putting them together.  She's right.  I just hope that maybe I'll be able to put this back together.  Gulp.

If you haven't been following me then you should know that this is the bike that I purchased following my return from my cross Canada motorcycle voyage.  It's a 1975 Yamaha XS500 and I intend to take it apart and rebuild it into a fun little cafe racer.

I started by removing the seat and battery:



Next, off came the rear fender, lights, and associated bits:



I then moved onto the tank, grips, and controls:



Then the wiring and the front brake hardware:



At this point I discovered that my speedometer cable was seized to the front wheel so I cut it off:



Then I finished up by removing the wiring loom and called it a night:



I learned a lot.  This bike was a lot more dangerous then I thought and I thought it was pretty dangerous. Rock hard ancient tires, lots of loose hardware (including the forks!!!), nearly empty brake reservoir, and general signs of poor maintenance everywhere.  I actually can't believe the bike ran given the poor condition of the spark plug wires and the rust in the tank.

Next up will be the engine removal, I've just got to find someone to help me lift it out of the frame and onto my workbench.

Cheers,

R.

P.S. If you've got an XS500 and you need parts drop me a line.  A lot of the things I'm removing won't be going back on the bike.  Things like the seat, gauges, fenders, etc will be going on eBay.

Offline SrgtBear

  • Posts: 840
  • The arsenic has oddly shaped feet...
Re: 1975 Yamaha XS500B
« Reply #6 on: Sep 20, 2010, 21:01:57 »
That engine was fun trying to get out.  It comes out on the right side (brake side).  If you have trouble getting it out remove the valve cover.  It ended up being a piece of cake once that was off.
Ted

Kawasaki Kaiju (怪獣) - 79 KZ650 - 700cc Bore Cam Rocket - http://www.dotheton.com/forum/index.php?topic=39748.0
75 Yamaha XS500B Cafe - Completed - http://www.dotheton.com/forum/index.php?topic=14392.0
74 Honda XL 125 - Original - http://www.dotheton.com/forum/index.php?topic=25706.0

Offline Royal

  • Posts: 18
    • My Blog
Re: 1975 Yamaha XS500B
« Reply #7 on: Sep 23, 2010, 03:57:07 »
I had some great news today!  I'm retiring from the corporate world effective immediately.

In order to celebrate I headed to the garage to continue the deconstruction of my XS500.

Now, I'm planning to remove the electric start on this bike so I removed the starter.  Once it's removed there is a drive chain that seems to have no purpose.  Does anyone know if I can remove this chain?



With the starter removed I noticed something a little odd.  The is an opening between the starter cavity and the outside of the engine case.  Is this normal for an XS500 or is this some previous damage that I should have repaired?



Next, I removed the engine mounts and supported the engine.  It's ready for removal.  I just need a helping hand:



Finally, here is the organized chaos of my garage:



Cheers,

R.

Offline JRK5892

  • Posts: 9755
    • The Powder Pro
Re: 1975 Yamaha XS500B
« Reply #8 on: Sep 23, 2010, 10:31:26 »
hell ya! you going to rebuild the whole motor is that your plan, if not i would say leave the chains in place, when you pull that motor lay the bike on the side to pull it. hell man that thing is in really good shape! the frame looks great and the paint is awesome! love the flat tracker bars flipped.  hell ya bud! i can not recall a cut out like that in my starter bay but that was a year or so ago so i can not recall
Joe
"your life is an occasion, Stand up to it"
www.thepowderpro.com

recent builds: Hd street bob, TX cafe, KZ bratt, Goldwing tour, bratt wing, st fighter, road king, vriago bobber, chop, FXD, 1200 sporty, 1200xl sporty, GSXR, Royal enfield.. and more

Offline JRK5892

  • Posts: 9755
    • The Powder Pro
Re: 1975 Yamaha XS500B
« Reply #9 on: Sep 23, 2010, 10:33:06 »
ooooh ya! and i completely agree wit the crap carbs! i got a set of VM30s that i have yet to put on but am very stoked to... i hear the 32 is where it is at for this bike but i got the 30s for 100 an they came wiht k&n pancake filters... could not pass it up
Joe
"your life is an occasion, Stand up to it"
www.thepowderpro.com

recent builds: Hd street bob, TX cafe, KZ bratt, Goldwing tour, bratt wing, st fighter, road king, vriago bobber, chop, FXD, 1200 sporty, 1200xl sporty, GSXR, Royal enfield.. and more