recently bought a '78 puch maxi, approx 4000 miles, 70cc kit, proma
exhaust, 14mm carb. allegedly it came from arizona but is now residing in
boulder colorado. it ran pretty well for a month or so, though slow to pick up
on the low end. replaced the carb gaskets/cleaned the carb. intake gasket is
currently cork and seems pretty dry. upon spraying carb cleaner on
gaskets to check for air leaks the engine would die out rather than revving up.
piston seems to slap a bit when you let off the throttle and coast. tank
definitely has rust in it and needs to be cleaned. throttle speedo and brake
recently on a longer ride (5+ miles) the maxi died out after running WOT for a
good bit. engine was making a high pitch noise, something like a squeak
squeal. possibly a gasket going? after letting it cool I made my way back
toward my house not exceeding 3/4 WOT when the engine seemed to abruptly
die at higher rpm and coming to a full stop. I was worried it had ceased but
after spinning the flywheel it moved up again, ran slow for the return home
but then seemed fine the next day. on the next long ride (3 ish miles) it died
out again but this time will not start back up. when trying to start the motor it
sounds really bogged out and won't start. I replaced the spark plug and
noticed the wire connecting to the governor (black box) was fraying and not
securely attached. not sure if this is normal.
I was hoping to get some recommendations on where to start. I know the
tank needs to be dealt with first of all but wonder if taking the engine apart is
necessary. I peeked through the spark plug hole and it seemed pretty
carbonized inside. Perhaps sea foam could solve this problem? worried that
timing is an issue. moped has no kill switch so I have had to result in
flinstoning the flywheel. I know altitude can have an effect on the engine so
possibly jetting could be an issue even though I have only heard it four stroke
maybe once going down a hill.
Ill attach a couple videos in my next post of the moped running, along with
how it sounds now during an attempted start up and tank/engine photos.