Big bore!

Race tomorrow
 

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Ran amazing! Had a problem with the jackshaft tho and the chain coming off. Couldn’t keep the set screws in the gears so they kept moving.
Which chain?

If axle to jackshaft, then add a chain guide to control slap.
I use the plastic steering mount on an adjustable bracket.

I've given this advice for years.
 
Which chain?

If axle to jackshaft, then add a chain guide to control slap.

I've given this advice for years.
Yeah axel to to jackshaft. It doesn’t have enough room for a guide it’s real close I will try to get a pic. Just needs some shims so even if the set screw comes out the gear on the jackshaft won’t wonder
 
Blew up the 305 also was a rough weekend lol
 

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Thats just a broken valve . I'm waiting on the broken block
Pictures . :)
Lol i think he thought it thru pretty well.i mean if it breaks it would be down the bottom of cylinder in that area..but it looks completely blocked in with good quality aluminum weld job.i hope it lasts him a few good races.its really no worse than any other open motor.they are all grenades.especially these 4 cycles.
 
Thats just a broken valve . I'm waiting on the broken block
Pictures . :)
That was are backup motor after the animal broke! Lol I’ll post pictures of the animal when we get it apart. It broke on the bottom side of the jug where we didn’t reinforce it because we thought it was going to be strong enough.
 
Lol i think he thought it thru pretty well.i mean if it breaks it would be down the bottom of cylinder in that area..but it looks completely blocked in with good quality aluminum weld job.i hope it lasts him a few good races.its really no worse than any other open motor.they are all grenades.especially these 4 cycles.
True that any open motor your pushing the limits. They aren’t ment for being ran that hard
 
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