I ran mine with keyways and roll pins. Worked fine for the several hundred miles we put on it.

Id love to see your build. How long were the keys?

I believe they were 1/4" keys, 1" long.

I was nervous about it for a while till I put a 300lb man on it for a full day of riding. And of course the friend wasn't careful, held up just fine.

Nvermnd. I didnt realize it at first but I studied your thread and based my suspension off the measurements in that thread even bought the joints from the same place. So thank you. Im 180lbs so it should last!

Finally brought it home! Everything seems to work as it should. Water cooled head works too! Got full hydraulic brakes front and rear now. Now time to beat on it a little before i tear it down for paint.

What do you think of that DG Exhaust? Your ears bleeding yet?

This what I did to mine...

viewtopic.php?f=2&t=3084&hilit=spark

Its really loud! So that's just a spark arrestor? I will have to look for one. All my toys are loud but this thing is on another level and im starting to feel bad for my neighbors.

Already wanting more powa! This should help. Cr jug and mossbarger cage.

Wow nice work.

Any videos of riding? You'll probably want even MORE power down the road. Time to start researching a Rotax.

Thanks man. Having a hard time posting a video. I gota say im impressed with a stock 250. The thing is already pretty quick! Im sure the lighter chassis helps. I redesigned my watercooled head. Hope to start making them for ppl. First one just seemed a tad overkill! Ill have to make another when i do the elsinore build. In the process of resleeving that jug now.

Welp resleeve was a success! For those that don't know these cylinders have the cast iron sleeve casted into them so you cant just press them out. So made a fixture and with some help dialed it in the lathe and machined a 4 thou interference fit. Popped it in the oven and froze the sleeve and pressed new one in. Next step matching up all the ports which were all pretty close. Im running a running a reed cage so next i did the boost ports on the mill. Ill post a pic of the piston im going to use soon. Came with the windows already and centered ring gaps.

Getting closer. Got the jug back from the machine shop. Starting from a stock bore now! Cleaned her up real good and started assembling. The ring gaps clear boost ports which was my biggest worry. Now i just need to decide on what carb to run. Im thinking a tm36 maybe a 38