[Matt Martin]

high rpm = high speed = modified airflow which hits the seat when it normally doesn’t?  if it’s building that much heat, that you’re able to feel it only when the RPMs are high (i’m assuming this isn’t a steady-state), then the motor would have already gone kaboom, or started making awful sounds.

[William Martin]

Can you wiggle the crank nut up/down enough to notice? If so, check your main bearings before you carve a trough in the cases with your connecting rod…or maybe push it through the block! This doesn’t sound like an “airflow” heating issue to me…

Good Luck,

Bill Martin

[Daniel Wendel]

I can wobble the crank up/down if I rock it where the clutch cover bearing would be. I am just going to replace the bottom end bearings since I have no idea how may hours are on them.

[Craig Drabik]

I’ve had freshly built Leopards that throw off enough heat at high revs late in a session to feel it through the seat, so I wouldn’t say that lone is an indication that there’s a problem.

If you can rock the crank then you should do a bottom end.

[Walt Gifford]

use castor oil.

[Daniel Wendel]

Just a follow up,
I rebuilt the bottom end. When I separated the case I found the magneto side crank seal to have failed. Which I guess was blowing pulses of air out at high rpm.
Raced it last week and no extra heat was felt.

[Author]

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