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Junior Grue
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I havent tried this on an 1100 yet , but on many other engines , i have used my air compressor to pressurice the cylinder/head through the sparkplug hole . This pressure (around 10 bars) "holds" the valves while you are working .
Perhaps you misplaced a decimal and meant one bar?:?
Unless you're Magilla Gorilla you'll not be holding a piston on TDC, which is where it needs to be with that method, at 145 PSI air pressure.
 

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Junior Grue
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8,153 Posts
As long as you have all the rocker arms off so all the valves are closed it doesn't matter where the piston is using that method. Use as much pressure as you want. 10 bar is more than necessary but I have done it using whatever shop air pressure was.
You're correct.
I was thinking leak down testing on L-heads which I've done hundreds of.
 
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