I need some help tuning a few of my glow engines and I was hopeing to get a lesson on how to
best do it. The two motors are : K&B .20 and a SupreTigre .61.

The K&B motor is 20 years old. The only adjustment I see is the high speed mixture needle,
although there is also a small screw that rotates the entire spray bar assembly. Any suggestions
on how to best set this carb up?

The SupreTigre .61 is 16 years old (only about 30 minutes of run time). I see it has a high speed and a idle adjustment needles. My question is ; Which order do you adjust them?

One other question regarding the SupreTigre's muffler. If you slide the muffler all the way over the exhaust stack (?) it appears the exhaust stack's exit will contact the interior wall of the muffler. Is this proper or are you guys cutting the tube shorter to allow more clearance between the end of the tube and the inside of the muffler?

Any suggestions are appreciated,

Paul