Motorcycle Repair: 1974 yamaha dt100, yamaha dt100, fibreglass insulation

Question
Wayne,you said that i might have to cut open the exhaust and clean out  the oil soaked packing.How is that normally done in case it is the problem.Thanks for the tip about not useing premium gas but it rained so i did not check clutch cable and carb adjustment Thanks fo Qwick ansers      Ian

Answer
Ian,

-the backside of the pipe has to be cut open
with a gas type welder or hacksaw. All the old
oily packing and carbon removed or burned out
with a welding torch.

-There are exhaust repair
sites on the internet that have new packing
for sale or you could stuff some fibreglass
insulation in it to muffle the noise
better and act as a spark arrester.

-You could just clean it out, weld it up,
and stick a spark arrester on the end of the pipe.
Either way it needs to be rewelded.

-The other alternative is to find another
pipe which might be cleaner but it is hard
to tell until you try it on the bike.

-I don't recommend any other cleaning
techniques as they usually fail to get
the pipe cleaned out well enough.