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Old July 4th, 2018, 01:48 PM   #6
DannoXYZ certified postwhore
Name: AKA JacRyann
Location: SF East Bay
Join Date: Dec 2011

Motorcycle(s): CB125T, Ninja250R racer, Ninja250R street bike, EX250F#1, EX250F#2, VF500F, CBR600RR

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Yes, but without lots of previous experience, how would you know how much vacuum is necessary? I had similar problem where bike would run for 30-seconds and completely fall flat on its face when I got to track and opened it up. Turned out I had looped petcock hose just right so that when I laid tank down, it would pinch and kink hose. Just barely enough vacuum go through to barely open petcock enough for idle & low-load flow. As soon as I gave it more throttle, gas-flow wasn't enough and bike almost threw me over bars!

Originally Posted by Triple Jim View Post
Another possible source of the trouble is a clogged gas cap vent. That's a known problem that can do what's happening to you. That one usually lets you get a few miles down the road before there's enough vacuum in the tank to stop flow.
Yes, the infamous hissing whining squealing tank!!!
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