Author Topic: Mike Anderson SR-100  (Read 35436 times)

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Offline Mike Anderson

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Mike Anderson SR-100
« on: November 16, 2014, 09:56:04 AM »
Dropped off the engine from my unrestored racer to Steve Reed last weekend. We were on a little trip visiting friends and family and had an opportunity to go by Steve's for a day. I am not familiar with the small engines and Steve offered to help. We will show some future photos of the engine coming apart and going together. It will not be a show bike assembly as the rest of the bike is not going to be restored. I want all the parts to go back as they were. Steve will be basically cleaning the metals and replacing seals etc. as needed. I am just cleaning the bike up, replacing the cables and getting it ready for engine reinstall. The little bike still has it's original tires and other pieces, I had the seat recovered and the number panel repainted otherwise unrestored. All chrome is pretty good so just cleaning. Hope to have it running by spring. Stay tuned for photos as we get them.
Later Mike

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Re: Mike Anderson SR-100
« Reply #1 on: November 16, 2014, 07:17:23 PM »
Mike,
I managed to free the piston that was sized in the cylinder and then set about to get the crankshaft to turn etc.
Pictures of the cylinder and piston so far this engine is in great shape for how old it is i will pull the crankcases
This coming week.
Thanks.
Steve.

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Re: Mike Anderson SR-100
« Reply #2 on: November 16, 2014, 07:19:52 PM »
More pictures,
Note the piston only had one ring in.
Thanks.
Steve.

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Re: Mike Anderson SR-100
« Reply #3 on: November 16, 2014, 07:21:25 PM »
More pictures.
Thanks.
Steve.

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Re: Mike Anderson SR-100
« Reply #4 on: November 16, 2014, 07:23:44 PM »
One more picture.
Thanks.
Steve.

Offline Mike Anderson

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Re: Mike Anderson SR-100
« Reply #5 on: November 16, 2014, 07:41:02 PM »
Hi Steve,
Looks like progress is being made. Between the two of us the little bike should be ready to ride in the spring. I will get busy cleaning up the bike on my end.
Later Mike

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Re: Mike Anderson SR-100
« Reply #6 on: November 16, 2014, 07:48:20 PM »
Mike,
When you get the engine back how about a video!!
Thanks.
Steve.

Offline Mike Anderson

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Re: Mike Anderson SR-100
« Reply #7 on: November 16, 2014, 08:33:18 PM »
Sounds good Steve, I can make a short video of engine going back in bike and then one of it running. Have been waiting for a long time to hear one of these run. Just sent parts list to Richard for the engine and talked to him about them. Should have them later this week.
Thanks Mike

Offline CL-100

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Re: Mike Anderson SR-100
« Reply #8 on: November 17, 2014, 07:34:42 AM »
I went through a GP 100 engine this past year and just from these photos I can see many differences between the two engines.  These pictures are great!  Looking forward to seeing more as the project continues.  Good work Steve.

Roland

Offline slawsonb

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Re: Mike Anderson SR-100
« Reply #9 on: November 17, 2014, 10:33:37 AM »
Hey Roland. Just as a learning point for me (and maybe others) could you share your observations? thanks
...bert

Offline dcr

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Re: Mike Anderson SR-100
« Reply #10 on: November 17, 2014, 11:20:55 AM »
I just rebuilt my 100 Sport engine and am also curious the differences between it, the GP100 and the SR100.
1966 175 DT and 1968 350 GTR

Offline CL-100

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Re: Mike Anderson SR-100
« Reply #11 on: November 17, 2014, 06:00:40 PM »
As far as the differences between my 100 GP engine and the Racer go, they prompt more in the way of questions than answers.  The first thing I noticed was the wiring coming from the Left crankcase cover.  The bike doesn't have any need for a lighting coil in the magneto but it appears to only have a few wires coming out of that area compared to six or so I have.  My bike is 6V and I believe these ran a 12V total loss ignition system so I'm not sure if it even has a rectifier or what (?) size coil.  They are listed as having a key switch and without a charging system  they wouldn't need much in the way of wiring for an on/off key switch. 

The clutch basket on the Racer looks deeper and if my counting is correct they might be running an additional set of plates.  I know they have a different Right side crankcase cover than a stock 100 so maybe it's deeper to accommodate the clutch and larger carburetor.  The stock bike runs a 17/18mm carb and the racer runs a 22mm.  The spigot on the rotary valve cover is different than my bike, perhaps to accommodate the different (larger) size carb.  They also ran a different rotary valve.  Cover reminds me more of a cover off a 90 or 175.

Not sure why they list a different piston and only use one ring.  I thought I recall these having a higher compression ratio than stock.  Would this improve lower end lubrication if you're running premix?

Offline slawsonb

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Re: Mike Anderson SR-100
« Reply #12 on: November 17, 2014, 06:20:19 PM »
Thanks Roland. The single ring would probably improve ring/cylinder lubrication since it's getting blasted from both sides and no dead space (in between 2 rings) to trap carbon or other crud.
...bert

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Re: Mike Anderson SR-100
« Reply #13 on: November 17, 2014, 08:09:24 PM »
Bridgestone SR-100 engine,
when i get more into the engine i will be measuring all the parts and i will list all the sizes so you can see differences between the
GP 100 Bridgestone engine and the SR engine.
Thanks.
Steve.   

Offline Mike Anderson

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Re: Mike Anderson SR-100
« Reply #14 on: November 17, 2014, 08:29:42 PM »
Steve,
Should be interesting to see the difference in port heights, rotary valve timing and possible piston differences between the stock 100cc engines and the racer. Keep us in the loop.
Thanks Mike

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Re: Mike Anderson SR-100
« Reply #15 on: November 25, 2014, 08:27:33 PM »
SR 100 ENGINE,
Well i got crankcases pulled apart and this is what i have found out so far.
The right side crankcase is damage where the stopper ratchet arm fit into hole
Stripped teeth on the kick gear, one bent kick start shaft we will need new
Crankshaft seals plus main bearings the crankshaft will need to be set-up.
List of parts so far.
Ratchet arm.
Stopper.
Kick -shaft.
Kick gear.
Ratchet spring and return spring etc.
Shift pin holder.
Gear change shaft.
Plus crankcase gasket.
Thanks.
Steve.

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Re: Mike Anderson SR-100
« Reply #16 on: November 25, 2014, 08:30:00 PM »
One stripped gear etc.
Thanks.
Steve.

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Re: Mike Anderson SR-100
« Reply #17 on: November 25, 2014, 08:33:09 PM »
Kickstart parts.
Thanks.
Steve

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Re: Mike Anderson SR-100
« Reply #18 on: November 25, 2014, 08:36:11 PM »
Crankcases split.
Thanks.
Steve.

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Re: Mike Anderson SR-100
« Reply #19 on: November 25, 2014, 08:38:47 PM »
The rest of the parts to be cleaned etc.
Thanks.
Steve.

 


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