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To your Edit--From what I have heard (from the owner of the website) he was new to the sport and was too anxious to hear it run, rather than to wait the couple of days to get a steel flywheel shipped to him.

Yeah, thats why I was a bit concerned when I first saw the post. My motor was built by Midwest and this is a video of a motor 95% the same. The only differences are: I have a newer cam grind, I am running two 56mm Mikuni's and I have a different chassis as them. The motors run very similar...

Stock Kohler specs are CH20, 20hp started at 38Ci. Now at 45.5Ci. Stroked, pop-out pistons, roller cam/lifters/rockers, Severly ported and polished heads. Too much to list. The types of clutches we use are similar to a car type clutch. The have a driver (bolts onto flywheel) and it then drives...

I guess, it might be OK in your guys's circumstances. In our tractors, we have the clutches running directly off the flywheel, I personally believe that this is one major cause to our flywheels exploding. But in a kating situation, I think it probably will be OK. I was just adding some personal...

I also never said it will happen to every engine turning over 4000. But it is still a possibility that it will and I just dont want to see anyone get hurt.

I have a 110cc (import) 4 Spd motor out of a dirtbike. I was wondering how big could I go on the chassis without being underpowered? It says in the manual its 9hp at 8800rpm. I would prbably be friving it on grass and pavement so I haven't decided what type to build or if its going to be a...

I am not into go-karts, but garden tractor pulling. I have personally witnessed a flywheel blow-up and it was not pretty. The engine was turning about 5000rpm on a cast flywheel. In tractor pulling, all clubs rules are over 4000rpm a billet steel flywheel is mandatory. Here is a few pictures of...