XS650 Side Cover Bolt List (by dimensions)

For the round alternator cover on the left side, it's better to use M5 x 12's or 14's. The M5 x 10's Yamaha used are too short .....



You don't need or use 17 washers. The only place washers are called for is on the 4 lowest screws on the right cover.They are copper sealing washers because those 4 screws are below the oil level .....

 

Thanks fellers!

 

I didn’t use copper sealing washers on the bottom 4 and no leaks that I’ve seen. Am I just lucky or should I remove those bolts and get the washers?

 

If you have these bolts in hand you can go to most any hardware store with them and just find the right bolts just by matching what you have.
Around me there are Lowe's, TSC, Home Depot. They all have most of the bolts you need to replace most out these bolts. The long ones that go through the stator I didn't find quite the right length. I had to go a bit longer and cut a bit off to match.
With the exceptions noted by 5twins.
Leo

 

Don't know if its worth mentioning, I've used longer screws and standoffish/spacers for the stator cover. Let some heat out. Surely there's tons of threads about it. What's the opinion on this?

 

dirt n water.......

 

Yes, I agree with Gary. I've read about this mod but am sort of leery about it possibly doing more harm than good. Get caught in a good rain and you would probably flood the stator and rotor pretty good, not to mention all the dirt and road debris that might get in. I think having the cover spaced out like that would make it act kind of like an air scoop. You'd get the extra cooling air of course, but who knows what else, lol.

Granted, my rotor recently failed on my '78, but it was the original as far as I know, and I can't see spacing my cover out making it last much longer than it did. It obviously didn't fail early due to having the cover on there tight.

 

I'd seen this done. I followed and done it on one. My one thought was: Alternators on cars aren't sealed. They're pretty exposed in various locations. BUT they aren't inches from the ground either. Good point guys. My 2010 Triumph Speedmaster 865 EFI got caught in some rain. It's been a random turd for problems since. Haha It does take a lot of heat for an extended time to melt the resin from the windings. Next thought: Need a drain hole if it's not sealed. Anywho appreciate the direction.

 

Yeah, the only ones among us who could get away with leaving their alternator cover riding away from the main case-cover are Mailman and Azman - no rain there.

...although I guess there may be some dirt somewhere around Arizona....

 

I`ve used these kits and found them much cheaper than HDW store bolts and they have the washers & nuts.

https://www.ebay.com/itm/YAMAHA-197...a=1&pg=2060778&_trksid=p2060778.c100290.m3507

https://www.ebay.com/itm/YAMAHA-XS6...a=1&pg=2060778&_trksid=p2060778.c100290.m3507

 

Umm.... ever look at the holes in a car alternator...

 

I being facetious guys.
I don't think having it exposed is a good idea either. And like 5twins eluded to... some of our alternators went 40+ years before they went to the happy hunting ground. That Ain't bad. I don't think the extra cooling is really needed.

 

One more little revision - you'll need a total of 11 screws @ M6 x 25.

 

I can't see the point of the copper washers if the gasket is doing its job properly as it seals off the bolt openings so fail to see why washers needed. they don't have them on the sump plate bolts.

 

My take on the copper washers: the bolt holes take away quite a bit of the contact area tween cover and case, kinda like belt n spenders they won't hurt anything by being there. But no matter how many you use it won't stop a worn tach drive shaft/seal from making you think your cover's leaking!