Jules’ favorite bike 1928 101 Scout

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Some more pages…

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And here are the last pages….

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[grease monkey]

I remember seeing that beautiful sidecar at Brookfield several times At the time it looked like it was new old stock and had just been uncrated. .
Interesting to read the story. Good luck with the refurbishment.

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Well, I pulled the cylinders to see what’s what and, well, not great news… IMG_2267.jpeg IMG_2269.jpeg

Yep, two different pistons…

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On the plus side the bores looked good, no gouges…
But on the bad side….

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A lot of rust, so this gotta come apart, something I was hoping to avoid. I’m guessing this spare motor was under water at some point, just like the bike.

Sigh….its always something….

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But wait, there’s more…

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Not only did Jules use two different pistons, they are different size bores…ugh. The front cylinder .020 over, the rear cylinder .060 over. C’mon man…..

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The cylinders originally on the bike are .030 over.
I have another set of cylinders that also measure .030 over and look to be in better shape.

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They look good but have been painted black. I got another set of cylinders that the .030 pistons drop right in but the .060 piston doesn’t, so they are either .040 or .050 over.
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So I’m going to mull over what to do. I don’t want to bore the spare motor front cylinder to .060 over, if nothing else but for time and expense. I’m leaning to using the black painted cylinders, I have new .030 over pistons, but no rings (I looked and Greer out of stock on all the Scout pistons and rings).

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One note is that the black painted cylinders had original 101 pistons. They have two thick compression rings and no oil control ring (total loss oil). They also are sized for .010 clearance in the bore for aluminum pistons as opposed to .003 clearance for the later Sport Scouts. If they were iron pistons, then .003 clearance.

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So the original pistons measure .007 smaller then the later ones.

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Just some pictures comparing the pistons…
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Notice how thick the original pistons are, and the later pistons a bit taller.

The recommendation in the 101 R&O manual is to use the later pistons and all three compression rings but either leave off the oil ring or use the oil ring but leave a big end gap. Since Jules used the oil ring on both these motors that’s what I’ll do.

[T. Cotten]

Seriously, Joe,...

Jules knew that the motor doesn't care if the cylinders are the same bore.

Hogging one out to match the other is a waste.

....Cotten