well today I got round to trying out the engine again... no success... I changed to 13x8 APC prop... the engine starts but seems to starve itself from fuel somehow... now I've checked the tank pressure by taking it all out and closing all pipes blowing into tank, tank was fine no leaks... so then after a while I got it running but once it goes beyond half throttle it dies... glowplug is good, fuel flow is good but its not getting sucked into carb... could this be something to do with the bearings also? crankcase pressure being lost? I want to get diagnoses correct here... don't want to strip the whole engine down and in the end it was something smaller and easier...