6m6 Motor Parts Identification

S

skinypedal

Location
Wichita, Ks
Bought my first SJ in January thinking it only needed a carb rebuild and paint. Got it home and slowly realized it needed a full rebuild. I just started painting it after re-foaming, installing foot holds, and reinforcing engine bay cracks.

I just dug into the engine and carbs and I need some help identifying parts.

So far I have figured out it has the following:
Protec Grate and Ride Plate
Solas Supra YB-SC-B Impeller
Protec DBP Pipe, I believe its their A-pipe
Protec dual carb adapter with BN 38 round pumps

The two things I'm currently struggling with is identifying the cylinders and head. The cylinders seem to be cnc ported and are engraved PRO III. Just trying to figure out what I have, they look good. They do measure standard 6m6 bore.

The head is either modified or an aftermarket piece. The one cylinder is pitted bad enough I would prefer to not run it so the goal is to identify it and find a good replacement. I cc'd the head and it came out to be about 23ccs but my test method was not very accurate, I was only looking for a ball park.

I got it to blow 165/155 dry and with a little oil since the one cylinder was super dry it blew 180 and 185. I have since learned i had a cracked reed in the low cylinder.
I just found out that the crank bearings are shot in the cracked reed cylinder, so now I need a crank too.
 

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SteveC

SteveC

Location
West MI
So ive got a whole 6m6 motor that ive owned in a ski since 1996. Ran it last year for the last time and now it’s out to make room for a 701. Any interest in that? Note that it’s missing ebox, starter, flywheel and cover. Basically i reused the electronics, but head, cyl, case, pistons, carbs... all still as it was in the ski.
 
S

skinypedal

Location
Wichita, Ks
tor*p*do said:
Replace with a 701. Not worth putting more money into a 650 if the crank is bad
Click to expand...

I was hoping for a 62t when i started looking for a superjet since I had a wave raider in the past, but since this one had the 6m6 with CNC ported cylinders i was thinking it would out perform a 62t swap with just this pipe. Its lake season and I'd rather be riding than wrenching so I'm looking for an option to get me through the summer but also don't want to put money into a boat anchor. I just found out about the crank last night so thats why I'm trying to figure out what cylinders and head I have to fully understand my options. Lookls like one option for the head is ADA will do custom domes so I could get a girdled head that would also work on the 701 if i make that transition. Any idea whose cylinders they are?


SteveC said:
So ive got a whole 6m6 motor that ive owned in a ski since 1996. Ran it last year for the last time and now it’s out to make room for a 701. Any interest in that? Note that it’s missing ebox, starter, flywheel and cover. Basically i reused the electronics, but head, cyl, case, pistons, carbs... all still as it was in the ski.
Click to expand...

Does it still have the factory exhaust? What part of MI are you in, I have family coming down from WI in a couple weeks.
 
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