justin_o_guy2 wrote on 09/15/21 at 20:57:14:


I can't remember each time but it seems to be happening at a mid-high level fuel point. But the tank is on a pretty steep angle so, it could be considered low even at what I think is mid level due to the angle.

I know the tank has an aftermarket RSD fuel cap. I'm sure it's vented...but how well I'm not sure...

The problem us your diaphragm/slide assembly.

My bike did the same thing while accelerating once.  Just dropped all power after shifting, bit came back before I rolled to a stop.  

Another time I pulled out of my drive and it was low on power and wouldn't go beyond 20mph.  My bike already had a raptor petcock.  I went home, shut it down, poked around for a few minutes and it ran perfect when I restarted the bike.  

This exact same thing happened to me previously.  I had done some jetting and it wouldn't go over 20 mph.  I figured I lost vacuum on the slide.  It looked good when I pulled it out and the bike ran perfect after input it back together. That was my clue.

The coating on the slide was worn and it would stick.  So the butterfly opens up, but the slide doesn't open.  It creates a lean condition that fixes itself as soon as the slide comes free.

Clean or replace the slide.  I replaced mine and it was the best $120 I ever spent on my bike.