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How to lock engine at TDC for leak down?

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Trying to give my Husqvarna TE570 a leak down test and I just can not get the thing to stay at TDC. I can't even get it to hold 10PSI.

- Tried putting a wrench on the crank nut but it's reverse thread and just spins off.
- Tried putting the bike in 5th, rolling to TDC with the rear wheel then standing on the rear brake and it still gives...I'm guessing it's the clutch that slips because the tire is locked. The clutch is brand new and bites like hell while riding.

Any other tricks?

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