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Old 10-14-2016, 05:28 AM
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Join Date: Sep 2005
Location: Central Coast NSW, AUSTRALIA
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Could it be that when you wind back the comp screw that the contrapiston doesn't actually move? It can be hard to tell sometimes. They often get stuck with carbon in the liner after a period in storage. The solution is to disconnect the fuel line, wind back the screw a few turns, prime the exhaust against a closed piston and then flick the prop really hard. It should give a quick burst and stop. This usually moves the contra upwards.

If not take the liner out, and using a piece of wooden dowel on the inside to tap the contra up a bit. Thoroughly clean the liner inside, reassemble and try again.