why not just carry the muffler and ride home to fix it? muffler isn't essential for the engine is it? it can still run without as far as i know.. just with more noise..
For weed I use a machete........we have very large weeds in SoCal.....come to think of it, NorCal too. Really...Here is my spread, minus my hex key set which was in the house.
Carry it with me in case... You only have to break down once to appreciate them later.
( I travel 30km a day, round trip, to work) The scissors are more for weed really...
A cell phone and cash come in very handy sometimes as well. AAA if ya have the duckets and ya just can't pedal home 
kat, i've had a few motors last me over 10k miles, and that's heavily modified,45+mph, but street use only.
once i started racing them, they don't last as long.
dave rust from arrow cycles put it into perspective for me.
the tracks we race on are just under a mile. 2 heat races are 6-8 laps each, with a 12 lap final. plus a lot of practice laps.
one day of racing puts at least 50 miles on my bike, all at full revs, slipped clutch, and flat out in the straights.
in a race, if it starts rattling, clanking, or anything else, i don't care as long as it makes it across the finish line.
most of the time it does. if it doesn't, oh well. since no one's invented a piston rebuilding tool, i need a bottle opener and a lighter to get through the rest of the race day.
and the bottle opener is optional...
)
