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May 13

Posts: 2

JR1954 says:

VT Shadow - Compression

I’m refitting the cylinder head on a VT Shadow 700c V twin OHC. The 700c was modified for the USA market and imported to the UK. I’ve replaced cylinder and head gaskets with ones made for the 750c as these were the only ones available and they look identical. I am unable to get any compression in either cylinder. At TDC there is clearance at the inlet and exhaust valves but as I torque the camshaft housing the gap closes and all valve springs appear to be compressed.

Is this normal with hydraulic tappets?

I would be grateful for any suggestions

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  • Posted 2 years ago (13 May 2013 18:28)

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Jan 04

Posts: 901

fogie says:


Are you at TDC on compression stroke??? because there are 2 tdc's on a 4stroke engine.....if you're not on the compression stroke, then both inlet AND exhaust valves will be "on the rock" ie. one just closing, and one just opening, and both springs will just be under pressure.

[This Reply has been modified by the Author]

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Nov 07

Posts: 2451

smidget says:


some hydraulic tappets it depends how you store them when out of the engine (mostly stored upside down, this prevents air locking).

Remove tappets and place in a vice ,use some wood to prevent damage to the running surface of the tappet and a small socket which can be inserted into the cup of the tappet  and slowly compress so that you expel any air in the tappet itself.

Hope that helps.

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May 13

Posts: 2

JR1954 says:

VT Shadow Compression

It's definately on the compression stroke. Too near to be otherwise - I turned the crankshaft 360 deg just to make sure. Think the problem is with the hydraulic tappets. Thanks for your response though

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