• GY6 150cc Yerfdog cranks but will not start.

November 2019 Forum Retirement
Due to lack of extra personal time (and too much spam), I'm retiring the forum and setting it to a read-only state. No new registrations or posts will be accepted as of 11/09/19. However, all information will stay up and searchable. If you spend a few minutes searching, you'll find the answers you're looking for. We may re-open the forum next spring.
 #10547  by Pilot31610
 Mon Sep 05, 2016 11:33 pm
Spring of 2016 I replaced piston, cylinder, head, CDI, coil, plug and kill switch. Bypassed brake kill switch. Ran fine for probably 20 hours plus or minus. Parked it and shut it off for a couple hours when I tried to start it again it just cranks over. If I hold the accelerator pedal down at just the precise position it sounds as if it is almost running but as soon as the starter is disengaged it quits.

I have:
- replaced the CDI
- replaced the Regulator
- replaced the coil
- replaced the spark plug
- verified spark holding plug against case
- sprayed fuel mist in carb inlet
- verified fuel flow to carb

Any help would be greatly appreciated. At this point I'm completely stumped.