muffler question

Shnitzl Wed Oct 10, 2012 2:11 pm

I have a general question on the cox .049 muffler on my twin engine.
is it naturally difficult to tighten the cylinder down the crank case? the thin black metal on the top does crush down but I cant bottom the cylinder on the crank case as I am afraid of stripping the aluminum crank case threads.

thought I would ask before I fixture up the mufflers and make some passes with my mill to shorten the bases.

also, is the black spring band used just to prime the cylinders

John Goddard Wed Oct 10, 2012 3:34 pm

Hello Mate welcome to the Gang.
I think you've got the ring upside down
I know the other way up leaves the muffler kinda loosely
Fitting but that's how they are I'm afraid.
They don't 'muffle' a great deal either.
You're correct about the rotating ring,
It is to enable a prime.
Very Happy

Surfer_kris Wed Oct 10, 2012 3:52 pm

The crankcase of a cox engine is not flat (like it is on your twin), there is a little flange that sticks up over the rest. This flange goes into the the lower part of the muffler. So you'll need to remove material from either the muffler or the lowest cylinder cooling flange.

Shnitzl Wed Oct 10, 2012 4:50 pm

thank you both.

that is what I was thinking,
I can work this out. have a couple options in mind. Babe Bee .049

ps. are these mufflers available anywhere?

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