Guest rocketman Posted June 29, 2008 Share Posted June 29, 2008 I have a 582 mounted in a Cosmos trike. We recently renewed the water pump seals which meant removing the rotary vavle timing plate. First runs went great and got a few flights back in, then the springs went in the clutch. Replaced them. Next flight blew the clutch completely on T/O. This time replaced the clutch pads After rebuilding the gear box, I now find that there is sharp vibration at idle (it's pretty dramatic to see the engine bouncing around) but this disappears at about 3000 rpm and by 4000 rpm, the engine is smooth. I'm trying to sort out whether the vibration is due to the clutch slipping at idle rpms, or have we got the rotary vavle timing wrong (too far advanced). We only had a screwdriver to determine TDC of the piston for timing. We haven't done any more test flights yet to see how the engine performs in flight.For non Cosmos readers, Cosmos threw out the original clutch assembly and inserted their own. Cosmos have since gone bankrupt and theres no spares around. We've determined that we can re-manufacture most of the clutch parts. We're up in Malaysia so we don't have a lot of access to spares here and I don't want to go down the road of a new gearbox yet. Anyone got any clues?Neale. Link to comment Share on other sites More sharing options...
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