Hi,

Are you like me and don't want to dissassemble the motor unless you have to? I use the following method that I first saw in a modelling magazine. For the less than totally, inch deep gunked cases I have found that spray on oven cleaner from the supermarket works really well. Home brand is fine.

Remove carby and plug opening with "blue tac" or similar. Plug the opening of the muffler. Spray on oven cleaning foam and let it sit overnight and then remove with a gentle spray of water from the garden hose, (preferably not over your spouses prize orchids). A nail brush or tooth brush can help in the hard to reach corners and between the fins. Don't forget to wear gloves and eye protection.

Cheers,

Colin