One of my dl3 30's has a smaller muffler than the other. Is it ok to run a dle 20 muffler on a dle30?

The 20 and 30 have different size muffler bolt patterns. They don't interchange.

These have the same bolt pattern but one is much smaller in size than the other. I was thinking of trying the smaller one because the larger has a broken pipe but I didn't want to overheat or cause other damage to the motor by using the small one.?

The bolt spacing on the 30 is 34 mm and the bolt is 5mm. The 20 bolt spacing is 32mm and the bolt is 4mm. The exhaust port on the 30 is quite a bit larger than the 20.

Thanks for the data. Even though the smaller muffler fits on the DLE30 I took it off. Guessing it would cause too much back pressure. Can you recommend a good way to clean out the threads on the engine muffler flange?

Are your current threads stripped or just full of gunk? If stripped you will have to repair the threads with something like a Helicoil or other thread repair insert. If just full of gunk like LocTite residue, you can chase the threads with a proper size tap.

They are just full of gunk. I will try cleaning with a tap but don't know if that will clean enough for thread locker on the new muffler.