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15cc should be around 11.5”-11.75”. Make the hole the same size as the ID of the brass fitting. Regulate flow at rudder.

Yes, but do not get any in your water or fuel tubing, it will make them soft and deteriorate. I like to use it only when the engine is out of the boat and being stored. In between days at a race a run WD-40 through the engine and then flood with Marvel Mystery Oil.

I feel like I could have left them in, motor ran great before I took them out.

They were NTN. Tabbed. Yes I’m positive they are fully seated.

Actually still have them on the bench. Was thinking about taking them apart to see what the balls and races look like. Radius’ look the same on both sides.

Now I’m curious!! Maybe also due to (2) different manufacturers!! Full disclosure, when I changed bearings mentioned above, Al only sent the big bearing because he hadn’t received his full bearing shipment from WIB yet. So, I used an SKF small bearing in the interim. I’m not gonna pull the...

Not excessively. I think the big bearing pocket would need to be a few thou deeper to release some end play if desired, but so far I have not seen a need to do anything about the end play. Bearing to case fit is nice and the crank fit in the races is good also.

Not in F but you can in Twin Hydro. But .80’s are all you need. 🤭

I ran the test engine pretty hard with the bearings that it comes with and had no issues. The rod has not been modified, and it has had no issues. I installed new bearing in mine a week or so ago and it had ZERO end play, motor still ran great at the race last weekend.

The motor still works.

Yes

CMB

I have only ran this engine with a CMB .21 Nitro pipe.

Al has WIB 6000 big bearings in stock. He has the small bearings on order from WIB.

It was mid morning, I was still nursing a Kahlúa and coffee. 🤭

Cause I though it should have been cast with FOR AL on the case. 🤣🤣

Took the K-21 engine down today to inspect and change bearings for the season opener next weekend. This is after approximately 4 gallons of 60% w/18% in an outrigger.