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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > Bike won't run right
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Author Topic: Bike won't run right  (Read 1103 times)
Fawkesy
Member
*****
Posts: 7
« on: May 28, 2011, 02:50:16 PM »
Hi. Posting for my friend. 2000 I/s.
Bike will start right up when cold, run for 10 minutes (exactly each time) then start running rough.
Let bike cool for 10-15 mins, then try again and exactly at 10 minutes runs rough.
No vaccum leaks, no carb / fuel problems. Fresh gas. Checked all coils - okay.
Can anyone help us out?
Thanks so much.
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Mr.BubblesVRCCDS0008
Member
*****
Posts: 3025

Huffman, Texas close to Houston
« Reply #1 on: May 28, 2011, 03:14:27 PM »
Pop the tank cap open and see if it stay running longer, maybe be the vent tube is plugged and pulling a vaccum on the tank.
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Fawkesy
Member
*****
Posts: 7
« Reply #2 on: May 28, 2011, 04:07:30 PM »
Thanks Mr.Bubbles.
Tried that...wasn't the issue.

We just tried the bike (with gas cap closed) for 35 minutes and she ran good!...now i'm really stumped.
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Gryphon Rider
Member
*****
Posts: 5227


2000 Tourer

Calgary, Alberta
« Reply #3 on: May 28, 2011, 06:01:35 PM »
Sounds like it may be a tear in the vacuum diaphragm in the fuel valve.  The valve partly opens allowing fuel to flow at a reduced rate.  If the problem improves with a full tank of gas it strengthens my theory.  Higher fuel pressure pushing past the partly closed valve is better able to adequately feed the engine.
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