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Summary of today's activity: Had a look under the tank- visual inspection of fuel pump/ connections. No corrosion or out-of-ordinary conditions here, but didn't do any wiggle testing with engine running. Checked 4 ground spiders accessible under tank. All were in the same (good) shape I...

OK, removed new Motobatt battery and checked voltage at terminals: 13v, versus old Yuasa (charged): 12.7v (still works, but unreliable- I have put it in a lawnmower). Had bat load tested at Autozone- tested good with tester set at 140 cca. Reinstalled bat & rode 20 mi.- no bads, but that...

Donal: What sort of battery do you have fitted? How old is it? Just installed a Motobatt brand AGM less than a month ago. Also have a voltmeter- (connected through fuzeblock under seat), which indicates resting voltage @ 12.3v, and starting voltage @ 10.xv. Will get a better reading directly...

Detached, cleaned, reassembled main ground to lower right portion of frame; looked OK. (Battery/connections good; ground spiders serviced/RR's fix installed sometime early in 2012;) other connections unchecked. Took a close look at side stand/switch. Everything tight and operating properly...

Thanks to all for sharing expertise and advice; I will get it digested and now have a much clearer idea of what symptoms to look for, and what to do (clutch in/no throttle) and observe (tach rpm, e.g.) the next time they do occur. I will complete the checks I listed above, then later...

OK, here's my plan of action for this weekend: Check battery connections- where? @ battery are confirmed good. will check ground to frame. where else? Side stand- inspect closely for operation/mechanical issues, inspect connector to harness. Kill switch- check for sensitivity, connector...

Just to make sure I clearly describe my prob: It's on/off like a light switch- battery connections are confirmed at battery; ground should be good to frame, but will inspect. Happens only when fully warmed/hot. Always occurs at same RPM in 5th or 4th gear. But could perhaps occur in lower...

Yeah, very similar to mine, except in my case the cut occurs after prolonged steady throttle, but will resume usually with some throttle input. I lean to TPS, but I assume there's no way of knowing without TPS replacement. Willing to check other possibilities before I start random replacement...

Ray: I'll take a stab at your questions/comments: 1. Is sidestand switch OK/loose? - Feels secure; plus the first/last mile of my commute is over a rather rough, bumpy road/driveway, where I would suspect the prob would manifest itself if the cause lay in a mechanical issue with...

Will check by this weekend (or before if I can) and report back. Original was replaced @ maybe 20,000 mi; cleaned once after that @ 30k.

No PC.

Rayzr, I'm discounting fuel issues, as the problem occurs across a spectrum of fuel conditions: full/low fuel level, low/high octane, with/without a variety of fuel treatments (including Seafoam), through many tankfuls of fuel from lots of different suppliers (7-8k miles worth). Almost always...

I want to join the discussion here and add my $.02: My 2008 (42k mi) ran pretty much flawlessly until around 35k, then developed the same symptoms as OP's bike. Symptoms: Engine intermittently, repeatedly, irregularly, and briefly (1-several seconds) "cuts out", or stalls (as in, "dead as a...

I took this a step further, and left the little buggers in the spare parts bin. Been running fine without them for around 18k.

I'm assuming here that, as concerns your FJR, you are not, indeed, able to blow or suck air through the gas tank vent line with the gas cap open.

+1 What he said.

The fuel injector map for each cylinder is individually adjustable. Of course, one must first perform the Barbarian Jumper Mod. Check it out here: https://www.g-mac.net/fjr1300/gen_2_fjr1300_bjm.pdf

TICK, TICK, TICK . . . KABOOM! Find yerself a low mileage Gen II & never look back.

++1 Fred. Imminently usable. Even I can understand it. Me likey!

It is a fact, proven by many on this forum, that the fjr cannot eat a car tire.