I took the pipe apart and theres barely any muffler packing left. At most theres under a handfull laying at the bottom of the muffler where it joins the header/engine.

The muffler itself is basically empty. Theres no muffler packing left really.

Is this going to be a problem other than the noise?

Can this be a backpressure issue and can it affect my performance?

 

The pipe should be fine, except for noise. The carb should have a vacuum tube connected to the intake tube if it is stock. Rejetting is a breeze if it is stock, remove the bowl and pull out the main jet and put in a bigger one then put the bowl back on. You may have to remove the carb the first time cause the screws on the bowl usually strip the heads out if they have not been replaced.

 

ok thanks I'll have a look

 

my ds650 is boggy backfires and has no power I cleaned carb and parts installed all.new parts. Still didn't help replaced with the old.parts again it atleasts starts with no but the problems still remain the gas tank breather tube is fine not sure the problem.but gota get it fixed in a hurry to sell because winter is coming and I need fuel

 

Bogs during full throttle and a lot of popping and back pressure when letting off throttle.. what's the problem