Mike Anderson SR-100

[Mike Anderson]

Great job Steve,
I will get all the parts lined up an hopefully the little motor will be good as new when you work your magic. It is great to have you familiar with the small motors, I have only worked on 350's. During the holidays I hope to be able to spend a little time cleaning on the bike itself. Would be a shame if you get the engine finished before I get the bike cleaned up.
Thanks Mike

[CL-100]

Great pictures Steve.  Looks like the clutch pack has 6 friction plates and 5 inner plates, which is one more set than stock 90/100's.

Is that red fitting on the rotary cover spigot an adapter for the larger carburetor?



Roland

[Mike Anderson]

Starting clean up and repair on SR-100 chassis today. First thing on list is to straighten the handle bars. Looks like they were bent in a right side crash. Hopefully I can get them to come straight, don't have any crease in them so should work. Also want to try cleaning paint or whatever from decal which was applied at sometime in it's history. Not sure what it says but looks like racer something. Hopefully I can save it, parts of history are nice to preserve. Will post more pictures as it goes. Ignore the date on pictures, need to adjust camera's date.
Later Mike

[reed]

Roland,
The fitting is for a larger carb, like i said before this is a very interesting engine to work on!
Thanks.
Steve.

[OldSwartout]

Steve, it looks like the red fitting is the plastic insert from inside the end of the 22mm carb.

[Mike Anderson]

Hi Karl,
I think you are probably right. Don't remember if there was an insert still in the carb after it came off. Hopefully Steve can get the little engine back up and running, probably going to need another case if this one cannot be welded up. Was hoping to use all the original external parts, trying to keep the bike original looking. New stuff gives it the restored look since everything else would need cleaning to match. Hope everyone has a great Thanksgiving holiday.
Later Mike

[OldSwartout]

Was hoping to use all the original external parts, trying to keep the bike original looking. New stuff gives it the restored look since everything else would need cleaning to match.
Later Mike

If you or he can find a good used one, it may have the necessary patina.

Heating a new one with a torch should oxidize the surface enough to get rid of the shine, but there are probably other ways to make it even better (worse looking).

Nice project.

[Mike Anderson]

Thanks Karl,
Hopefully we can find a case to use, new or used. I think they are different than the  standard case, so may be tough to locate. I don't have it in front of me but am assuming there is no mount for oil pump and the intake port is different. Probably can file and contour the port to work but no nothing about the oil pump mount surface. Maybe it can be blocked with a thin plate. Anybody have any experience with these engines. I have not, never worked on any of the small ones only 350's. Hope everyone had a nice holiday.
Later Mike

[OldSwartout]

I'd guess they used the same casting, so the intake port would have been the same as stock to start with, just hand worked to open it up to match the rotary valve cover.  They may have skipped the machining on the oil pump mounting, similar to skipping some of the machining on the SR175 case for the right side oil line, oil pump drive vent to the crankcase and the shift selector lever hole.  However, if you put a cover plate on a stock case, it won't show once the carb cover is installed, so it will look OK from the outside.

[rocketman]

 A work of art. Hand ported intake and transfers in these 100 SR cases. Rest of the casting is basically the same. Oil injection ports may not be machined but a standard case will still work as they are not needed. Outer case is where everything changes. SR100 has sand cast one off individually produced right side case, carb cover and carb cap. Engine cylinder is also sand cast as is the rotary valve cover and front brake plate. Crankshafts are factory processed, special piston and rotary valve. Special carb, choke delete. SR's also have heavier clutch and rotary shift stop. Frames are special, there's a lot of subtle differences also. Love these bikes. Nice work so far Steve. I'll call you about your case and front fender Mike. Thanks, Mark.

[Mike Anderson]

Morning Mark,
Thanks for helping with the SR100  into. Let me know what you find on the fender.
Later Mike

[reed]

Crankcase,
Removed the bearings and the bushing and the studs from the damage casing.
All cleaned up ready to send back to Mike to be repaired.
Thanks.
Steve. 

[reed]

Crankcase,
Picture of the other side of crankcase.
Thanks.
Steve.

[Mike Anderson]

Can't wait to see what I can do with it Steve.
Thanks Mike

[reed]

Mike,
Picture of your old kick-start shaft next to the new one, note no cir clip grove on the shaft.
Thanks.
Steve.

[Mike Anderson]

Hard to figure. Obviously a change was made to correct a problem. Gear and other parts surely needed to be located in a position. Mark if you are reading this, do you have any ideas? Let us know.
Thanks Mike

[reed]

SR-100 Bridgestone,
I put the clutch cover in the tank with a new mix turned out nice.
Mike told me not to over board with the cleaning but i can not
Help myself   
Thanks.
Steve.

[reed]

SR-100 Bridgestone,
On the inside of the clutch cover you can see some damage!!
Thanks.
Steve.

[reed]

SR-100 Bridgestone,
One more picture of the inside of the clutch cover etc.
Thanks.
Steve.

[Mike Anderson]

Great job Steve, can't wait to get the little engine running. I will work on the case immediately.
Thanks Mike