Quote:
Originally Posted by GMP
Remove the ball bearing check valve from the gas cap if you are running a check valve/vent on the shorty hose. Enlarge the pin holes in the rubber seal boot. I had a funny stalling issue at an enduro last year. I went through the bike, found nothing obvious but changed the gas cap anyway as I had a spare. At the next enduro I spoke to a guy who worked with Fred Hoess and was advised that Fred had this happen as well. I never had this happen before on any GG but I suppose its possible so I modified my cap and have never had a problem since. The original cap's seal boot looked odd like it was swollen, which is why I ordere the spare. Perhaps the small holes were obstructed.
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I recently experienced some trouble on long steep climbs as well. There were maybe 6 of these climbs on the route and the first few went good. I started to notice the problem on maybe climb #4 and by the last one, at the steepest part, no amount of clutch work would give me low end. It would rev high though and I managed to loop the bike out on 1st and 2nd try. Made it out on try #3 by hitting it with more speed, but still almost stalled when i downshifted at the top.
I was wondering about the mentioned "pin holes in the rubber seal boot"? The cap on my 13' 300 just has a vent hole in the top and rubber sealing gasket thats in good shape..
I'm going to look at the petcock screen today as well and check fuel flow. There is an inline ball valve in the gas cap vent line that goes into the steering tube.
Last climb starts at 8:20
https://youtu.be/7AelIZeHidk