I have an 08 Mastiff. I've had intermittent issues with vapor lock since day one. I took off all of the California emissions crap and added a vented gas cap. I completely drained my tank and refilled it just to have a fresh start. My bike runs fine for the first 65 miles I put on each full tank. After 65 miles it chugs, hesitates and sometimes stalls on acceleration from a dead stop. Once I get going (and don't stall), the bike runs fine until I have to stop again. If I take my gas cap off completely, I have no issue... but not smart to ride without a gas cap. Any advise?
Vapor Lock... Need Advise
- Thread starter montana
- Start date
X2
It’s probably the cap remove the guts in the cap and try it! I had the same issue and while riding with Raywood it happened he came back a said loosen the cap and when I did you could hear the air rush in!!!:2thumbs:
Five Five
Well-Known Member
Hey Russ....BBChop recommendation is where I would start....My buddy had the same problem he drilled an .030" pin hole in the cap works great....dont leak either...:up:
Even though you removed the guts out of the cap it still may be clogged with glue or something.
Look on the side of the plastic piece under the cap and locate the vent. Then wrap your lips around the threads and blow with your finger over the vent and see if it's venting.
