Trying to help a friend get his recently purchased
2nd
gen running.  He has a street ported 13b with a
weber
copy side draft carb.  The engine starts and runs
fine
for about 3 minutes and then it starts
backfiring/popping (a little) and loses power and
quits.  Let it sit for a while and it will start
back
up and run ok again for another 3 minutes.  I don?t think it?s the fuel pump cutting out since
he
has it hardwired on and it seems to be putting out
plenty of flow.  What else to look for?

Thanks guys!

Joa