Mounting Stator: Drilling Holes in Engine Case?

[allanrps]

I'm in the process of trying to upgrade the charging system on my xs400, and am trying to figure out how to mount the stator to the engine case. I saw in the thread on this forum about a member who did it who just slapped a metal plate between the casing and outer shell and sealed the gaps with some rubber sealant. Would I be able to drill and tapholes in the casing, perhaps where the ribs are, and mount the plate that way? How much room is there? Thanks!

 

[allanrps]

Anybody here who has cracked the engine case and knows how thick those ribs are?

 

[motoTrooper]

I have a parts engine disassembled, let me know (by photo) what area you want measured.

 

[allanrps]

Great, thanks. Heres a couple pictures. It's the left side of the motor, with the stator taken off the crankshaft. I want to know how thick the material is where the ribs are so that I can figure out if I can drill into them without putting a hole in the case.

 

[Norman1950]

What about having some standoffs welded on to the flats of the case?

 

[allanrps]

That's a good idea, but I don't have welding tools and don't want to cart the bike off if I don't have to.

 

[motoTrooper]

Okay here's what I got so far, from what you stated I understood that you wanted the area measured of the top half of the case. So I grabbed my top half here:







The thickness of the bearing area is 11/16ths, the walls between the ribs vary from 3/16ths to a bit less as you get up into where the machining for the piston skirt clearance but the casting obviously takes that into account and probably maintains that thickness.

Hope it helps if you need the bottom half done too, let me know.

 

[allanrps]

Thanks a ton, that's really helpful. It would really help to also get the bottom half, if it's not too much trouble. Thanks

 

[motoTrooper]

Here's the lower case, wall thickness is thinner around 1/8th inch.

 

[xschris]

Remember not to drill into any of the oil feed holes.

 

[allanrps]

Thanks you both, I really appreciate it.