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Hi Joern, I have been informed by OS that this product is discontinued unfortunately.:(

A production of 100Pcs has been made in September 2015 It took some time but all has been sold. Since then I have tried to convince OS to make me a new batch based upon the R21 engines but we have run out of discussion because simply too expensive for the small numbers possible to sell. We still...

If you look at the tolerances(outside and inside diameter) given by bearing manufacturers, you will notice that they are quite big compared to the tolerances used rectifying the crankshaft itself. So in a production it is very hard to get the perfect fit and even more difficult to assure the...

Hello Ricky, first of all good luck with this venture. We do not know each other but I have some very old connection with the Metkemijer brothers and we all share the same passion. I have read this post with interest and would like to share with you some of my findings and let you guess the...

M2.6x12mm part#79871040

M6x1 left-threaded.

Hi, Always good to be able to adjust your engine while you are running. For where to put and where to buy check the following topic for this: https://www.intlwaters.com/index.php?/topic/75748-remote-valve-setup/

Hi, You can put it on any location, as long as it is not too far away from the carburetor.

Hi Bob, Yes, that is an .21 outboard engine. Only for .21 size engines there is a wide range of homologated pipes available. Unfortunately not for the .45 size engines.

We use 1/8 car mufflers, they are easy to get less noisy and easier to find the tune.

For whom is interested I still have some of these available: http://www.worldchampionproducts.com/en/tp01001-21xm7/378-crankshaft-21-ob14-168-35-245-cwr.html

Thanks for sharing, interesting.

Replied...:-)

Nice Idea, neat finish.

OS has raised their pricing probably due to not enough production. The deals you can find are of previous productions so take profit of this while you can...:-)

It has a specific 7-port liner made for Outboard racing and a specific crankshaft and backplate which fits the OS leg. It is possible to use the piston/liner of the 21XZ-R in this engine which will even make it faster but not really needed in my point of view.

Just released the water cooled version and you can find it here : http://www.worldchampionproducts.com/en/marine/1270-vs-horsbord-pto-21.html