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Not that these are terribly exciting but the Mk1 engine head has five fins and the Mk2 head has seven.


The exhaust can on the Mk1 is sealed on the face of the can (left) and the Mk2 exhaust can is sealed on the back side (right).

Looking good so far,RJ.

Some of the differences were not always linked to the S15R vs the S15R2... a few quick points, from memory:
- The larger engine cooling head was an upgrade option on the Mk1. Some later S15R2 heads were also a darker blue.
- The sealed can exhaust was a running upgrade, as the 2-piece one leaked (ask me how I know).
- I thought I read somewhere that the S15R2 block had more strengthening.
- Carbs are indeed different, and are the main visual point of reference for the different engines.
- Don't recall the clutch / flywheel being different... are you sure the brake shoe screw didn't just create it's own clearance?

Loving the disassembly shots..... and looking forward even more to the assembly and running shots!

Alex

Got the crankcase all cleaned up which came out pretty good, much better then before. Just need to get a new rear bearing and we can start putting it back together again.

Here is where all the violence happens.

Oops


All fixed with new fuel tube

RC10th wrote: ↑Thu Dec 24, 2020 8:39 am Oops


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All fixed with new fuel tube


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I have had that happen so many times over the years, I can hear the sound in my nightmares even today.... zzzzzzing!

Luckily it's pretty easy to fix, some are a real PITA.

But yeah, every time you hear the spring noise a new curse word is created

Mr. Schumacher (AKA Alex) comes through with the goods.

I should have put it in by now but it has been too cold

RC10th wrote: ↑Mon May 24, 2021 5:45 am Mr. Schumacher (AKA Alex) comes through with the goods.

I should have put it in by now but I has been too old


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Fixed it for you, mate

I finally spent some time on this again and replaced the bearing.

I've also jumped in and assembled most of the engine, just need to clean the carb and it will be done.

Without going overboard I cleaned and scuffed the clutch shoes/bell, and sanded some of the larger scratches out of the flywheel. There is some oxidation under the anodizing of the head so it's as good as it will be. Not perfect but looks pretty good.

Sweet! Great work!!!

When you're done with this one, I'll send you up six or eight more....

Carb parts all cleaned ready for assembly

And done......

RC10th wrote: ↑Sun Oct 17, 2021 7:39 amAnd done......

So is this running yet RJ, or are you delaying starting it up (and thus, completing the rebuild) after I threatened to send up 6 or 8 more?