Reply To: No spark gt125r 06
Not just the pilot jets clogged, but remember the “Permanent Jet” that is next to it? That is for starting and nursing her to idle back to Pilots. Those 2 cannot be blocked and including the passages inside the carb itself.
If the Pilots are clear, but also use Compressed Air with a straw, spray every little hole you see inside the carb until you can hear swooshing inside (pathway now clear)
Remove the intake manifolds -> Replace the o-rings (These little bastards) make the bikes hard to idle if they even so much as let some vacuum escape under there
If the o-rings are new -> Try to fully clean the surface where they sit so it’s 100% smoothed out. use a PLASTIC toothbrush and scrub hard (no wire brush!)
Then use a little bit of Engine Oil to dress up the o rings wet and install them back.
When it runs , spray carb cleaner around that area to see if revs rise again, then you may have some kind of crack on the intake pipe itself.
AirBox = Front Carb on front Cylinder ==> Check the airbox has fully consumed the front carb, if you see silver lip (carb top rim?) sticking out, there is your future idle problem there.
Final checks, make sure when its hot, do a compression test. I believe it really needs compression checking now.
Let her warm up 10 mins.
Both Spark Plugs out
Full Throttle
Crank It for 5 seconds
Get readings for each cylinder and let us know.
I went all over the place in my reply but i hope i made sense.