Mike Anderson SR-100

[rocketman]

Yeh I'm scratchin' the old noggin a bit over the missing cir-clip. Not that the groove and clip are missing, but why. I have a shaft just like the one you pulled out. I know of only one place such a part could be acquired. This may be an SR only part and there does not seem to be a separate part number for it. The question is might the deletion of the cir-clip allow for replacement of the shaft without splitting the cases? Tricky proposition, I would think, as the internal components might be tuff to keep in line. When fully assembled, the missing clip would not allow the shaft to simply be pulled out so long as the return spring is still engaging the shaft. It could cause it to "walk" a bit though. I'm glad to see you are going to repair the center case. I do have one but repairing the one you have is the way to go and cheaper too. Front fender is a one and only 4410-5010 MS. That's a metallic silver painted fender. You will likely never find one. They were made of nonobtainium when new. A racer part designation from the 90-S 4410 series, it looks like The 90M, 90TR, and 100TR which are all 4411 series.  Best replacement is 4411-5011 (XCI) or 4411-5600 (XCI). The 5011 is the exact dimensions. The 5600 is just a hair off. If I didn't tell you, you wouldn't know the difference. Both of these would look fine as is but they are chrome fenders and are pre punched with a few too many mounting holes for the SR so, to be 100% correct, you need to de-chrome, weld up a few holes and paint. I have an N.O.S. 4411-5600 if you need it. Mark.

[slawsonb]

They were made of nonobtainium when new.

I had always suspected the existance of this element. Thanks for confirming my suspicion as it helps to explain many parts I have found unobtain - able.

ROTFLMAO...made my day!

...bert

[mqtsteve]

Yeh I'm scratchin' the old noggin a bit over the missing cir-clip. Not that the groove and clip are missing, but why.

The kick shaft with the cir-clip groove is used on premix 90 models part#2621-5002.  The kick shaft that is plane (no cir-clip groove) used on oil injected models part#2621-3201.  The crank cases have minor differences.  I think the cir-clip keeps the kick shaft in place.  A small modification to the crank case on oil injected models allowed for the cir-clip to be removed (I think?).  Small flange (3mm) on crank cases of oil injected models replace cir-clip and locate kick shaft/gear.  First pic premix 90 crank case B(right side).  Second pic oil injected 90 crank case B. 

[rocketman]

Nice work. The height diff definitely makes up for the clip deletion. As for the why, I guess they just flat out didn't need it. Mark.

[rocketman]

So I just had to do it. I pulled a spare 100 engine off the shelf and turned it on its side as level as I could get. I removed the return spring and pulled the shaft out. Everything stayed put. Cleaned the shaft off, a little grease and right back in again. I did it a second time and jiggled the motor a little bit with the shaft out. I had to slightly re-align the components with a screwdriver and the shaft went right back in. You just have to check that its clocked correctly so the return spring has proper tension. So it looks like if your careful, the deleted clip could save you some time if you needed to replace a damaged or stripped shaft. I tried it on a TMX motor and cannot remove the shaft. did they go back to using the clip again? Mark.

[OldSwartout]

As an engineer, I suspect the stress riser from circlip groove led to failures at that location and they figured out a way to remove it. They would have saved some money in the process, too, though and that could have been the reason.

[reed]

SR-100 BRIDGESTONE,
I cleaned the other crankcase and removed the crankshaft and the mains, plus the 2 gear shaft bearings.
So when i get the other crankcase back from Mike i can rebuild the motor and it will go back clean etc.
Thanks.
Steve.

[reed]

Picture of the other side etc.
Thanks.
Steve.

[reed]

Gearbox,
Picture of gearbox all cleaned up and ready for Assembly!!
Thanks.
Steve.

[Mike Anderson]

Lookin pretty Steve. Can't wait to get the crankcase repaired and things together to run. Hopefully I can work on the chassis some this next week. Been kinda busy lately.
Thanks Mike

[reed]

The kick start shaft is bent and i also suspect the starter ratchet arm part number 2632-5000 is also damaged more parts!!
Thanks.
Steve.

[reed]

Carb slide,
The carb slide was stuck in the carb but ten minutes in the ultrasonic did the trick!!
Thanks.
Steve.

[rocketman]

 Everything looks nice cleaned up. You can really see the difference in the aluminum castings between the smooth case and the sand cast carb cap next to it. Mark.

[reed]

Crankcases,
Got the crankcases back from Mike nicely ported, so i put them in the ultrasonic all cleaned ready to be rebuilt etc.
Thanks.
Steve.

[reed]

One more picture.
Thanks.
Steve.

[slawsonb]

I just want to hear it. Please post a video when you get it running.
...bert

[Mike Anderson]

There will definitely be a video. I have never heard one run even though we had a new one at the shop. We never started it. They are my favorite of the Bridgestone's mainly because of there small stature. Can't wait to hear the sound. Have heard the 350's with pipes many times while we were selling them and riding them. Will run an original set of chambers on my current 350 and also a set of Kataro's. Should be an interesting comparison.
Later Mike

[reed]

Bridgestone SR-100 Engine.
Picture of the SR engine coming together, sorry for the delay i had a very nasty virus on my computer.
Thanks.
Steve.

[Mopar392]

Looking Good Steve!

One step closer to lift off Mike.

Lee

[reed]

Mike,
This is a better picture of your engine outside today.
We had snow yesterday and today we are in the 50s
Thanks.
Steve.