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Discussion Starter #1 (Edited)
It has only been a few thousand miles since I had a major service done.

Upon throttle up from a stop the motor hesitates above 2000 RPM and occasionally pops.

All fluids were changed. They did not think the air or fuel filter needed to be changed. I did have the complete set of speigler brake lines replaced during that service.

This just started in the last 50 miles after a fuel fill. So I as a start drained nearly all the fuel and will refuel with a primum tomorrow (5/30/17).

 

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Well, if it is bad fuel, maybe some water, your fuel filter does not like water in the paper element. You seem to have some suspicions.
 

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Discussion Starter #3
I could not change the condition by using a known good fuel. I had to resort to the dealer and drop it off this morning. First indication is fuel pressure/pump/filter....
 

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Enjoy The Ride
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The problem was a cracked fuel line inside the tank. Both the small lines on each side of the filter needed to be replaced. It is running better than ever.
I replace my fuel lines every 5 years now.
 

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I replace my fuel lines every 5 years now.
I put in the EME nylon lines so I hope I don't have to deal with them ever again unless I damage them on a filter replacement.
 

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I love these bikes when they are up and running! Glad you got it figured out and are back on the road.
 
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