Hi Allan,
Thanks for the advice and link.

Yup, my muffler is definitely different to what I've seen elsewhere - mine is cicular. Or should I say was I deconstructed that too he, he, so it's not very usable I'm afraid. I intend to buy a new one from Wacker Engines if I can ever get hold of the guy.

Regarding the link to the "Teaching a weedwacker how to fly" web-site it confirms everything I've read elsewhere except Joe Guzzardi says that the flywheel is purposely imbalanced to compensate the piston/crank etc. Now that has really confused me as it seems to contradict other peoples advice [sm=spinnyeyes.gif]

I'm gonna ask the question in another thread I started about which prop balancer to use... so if you'd like to reply maybe that'd be a better place (?)... [link=http://www.rcuniverse.com/forum/Flywheel_balancing_%2D_which_balancer%3F/m_1734528/tm.htm]Prop Balancer Thread[/link]

I might have a go at building one of those starters too

Steve