oil pump and tach

[x650118507]

Guys, while taking off my right side cover then dismantling my oil pump and tach drive, I found a tiny metal ball laying on my floor. I cannot find it in any diagram. it is not the ball that belongs with the middle of the clutch assembly. Does anybody have an idea??

 

[angus67]

what size it the ball? the clutch balls are 5/16". If you didn't pull out the mushroom shaped pusher out of the middle of the clutch, it didn't come out of the clutch.

 

[x650118507]

The ball on top is from middle of clutch assembly. Ball on bottom is what I cant figure out. Not sure the exact size. Its possible the smaller ball does not belong at all but it seems weird that during dis-assembly of the engine, this ball appears on my garage floor.

 

[pristic]

Its not out of a crank main or anything is it? (ball type not roller)
Factory Yamaha spare part?

No idea, but waiting to see what the experts say... interested.

 

[5twins]

There is a small detent ball on your kick start lever that locks it in or out but that usually doesn't fall out. That's all I can think of other than to say it isn't from the bike, or at least not from under that right cover.

 

[azman857]

Do you run BS 34 carbs on your bike? Choke detent ball maybe?

 

[TwoManyXS1Bs]

There's two check-valve balls, but they're 1/4"...

 

[gggGary]

One guess would be a steering bearing ball had lodged somewhere and it freed up during your disassembly. I have those things show up on my shop floor on a regular basis (one yesterday). I always start to worry about where they are from then shrug and say steering bearings. There are tiny ball bearings in the choke rod detents on BS34's....

 

[angus67]

for a few days, I had random balls show up on my floor. couldn't figure out were they were coming from. I sat down on my craftman roller stool and almost fell into my bike. The bearings were from one of the wheels of the stool coming apart!lolol

 

[YL82]

Just spit-Balling here, but on Page 75 of the Clymer Manual, Part #9, it is a Ball that goes down into the pump cover along with a release spring, gasket and pan head screw.

My 1976 Oil Pump does not have these particular parts and I don't know the year of your 650, but I assume this diagram is for an earlier 650 like a XS1 and/or XS2.