Hi Squid,

From reading your post, I wasn't quite sure whether you enlarged the hole in the exhaust pressure nipple and/or where you installed a baffle(s) as well as moving the tank forward. I'm interested to know what finally worked for you, can you let me know?

The newer engines seem to work well - GMS must have identified these problems. The newer engines have the carburettor holes lined up, and they have also modified the mufflers (silver center is older, dull finned is newer).

Just a hint, one time when I was trying baffles, I used a strong spring as the rear spacer (near the exhaust exit) on the bolt. By doing this, when I tightened the long muffler bolt with the nut, it compressed the spring and pushed on the baffle. This took up any slack between the baffles and spacers. It worked well and I thought I should pass this trick along.

Thanks for keeping at it.

Fly4Fun,

Wayne Miller