HES going bad?

[F14CRAZY]

I've been off the board for a while but I've still been motobricking.

Ambient temperatures were in the mid 80s or so this past Saturday. An accident had us sitting in stop and go traffic for half an hour or so. My fan got a good workout. The bike idled fine but when traffic cleared it hesitated for a while and was hard to build speed back up. I put the hazard flashers on and kept going but it took a mile or so to be able to get back up to cruising speed (80 mph). It was if it slowly cleared itself out, if that makes sense.

I've read of the Hall Effect Sensor causing issues at operating temperatures. Was my experience more like a on-time thing due to the extreme heatsoak or is this the first indication that my HES is going bad? If it was the HES I hypothesize that the HES went back to working normally as the bike cooled off.

Thanks guys.

[The Mighty Gryphon]

I guess that the question is whether or not the engine was not firing properly.  That could indicate an HES failure.  The other possiblilty would be the fuel overheating and vapor locking the delivery to the injectors.  The obstruction of fuel flow could result in loss of power without significant misfiring.  As you were able to get moving the air flow cooled things down and the fuel delivery improved returning the power. 

The full fairing some of our bikes have holds a lot of heat on the engine and the fuel system.  This can sometimes result in fuel boiling in the tank and vapor locks in the system. 

[Chaos]

from what I've heard HES failure is usually a go or no go situation.  it may be possible your plugs loaded up while idling then eventually cleared.  Just a guess

[TrueAce]

My guess is overheated fuel from the overheated engine. Experienced the exact same engine behaviour out West a couple weeks ago, running 80, temps over a 100, and when fuel got low, fuel delivery becomes sporadic, until I slowly lost poker and stopped. After thinking I was out of gas for about 10 minutes, it surprisingly restarted and got me to a gas station. With a 45-100% tank, no problem, but if it got down to under 40% , thank heat was boiling the gas and the fuel was not flowing. Did you notice your fuel gauge when your problem occurred?

[Laitch]

Following on from Gryph's and Ace's observations, do you still have insulation under your fuel tank, F14? Maybe it's time to renew it. Reflectix will work.

[Rcgreaves]

I recently had a very similar breakdown but in seemingly very different meteorological conditions. I found my self in a torrential downpour and pulled off the interstate to don my rain gear -the bike was idling throughout as I was pelted by hail and wind gusts that had me fearing my brick might high side off the side stand. So as I struggle with my gear one cylinder dropped and the idle began to lope.  By the time I could get my gear sorted the engine had stalled. It restarted but was unable to rev of past 4K and Idle was impossible- clearly it was running on only two cylinders. A generous Lady directed me to her garage where I park my bike overnight i opted to trailer it home...

it took a couple of days to get back to my machine in the garage -busy time at work. It started now and revels  normally suggesting moisture but it was still being sluggish after inspecting The coil wires I cleaned and re-gapped all three plugs... all were in .3" range  They looked black with Soot from too Rich or over Rich running. With the plugs reinstalled the bike seems to be back to normal I've ordered fresh NGK plugs and contemplating the replacement of the coil wires. Are the oem wires nece$$ary?
It ticks  over now at idle quite solidly nevertheless.  My overall point is that the temperatures dropped to the mid 50s with the rain and it proved to be plugs. If moisture got into my coil wires it must have evaporated.  How do I know if my bike is set up and running too rich?


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[F14CRAZY]

Thanks for the replies guys. The same shit happened this past weekend. We had to pull over to let the gas cool down. I'm going to do something like relocate the fuel pressure regulator or add a cooler for the gas

[TrueAce]

I'm telling you from actual heat-driven exasperation, you gotta keep the tank pretty full, say 100 miles between fuel-ups, whenever your are riding in high heat weather.