[csbrooks1984]

Went for a ride and after a short stop. Bike started fine and idles fine but if I rev it up even in neutral it goes up normal but then bogs down. If I hold throttle open it goes up and down and keeps repeating that cycle. Ran perfect for last 2 years. Air filter plugs and oil changes in may and that's all I've ever had to do each summer.

 

[Bilgemaster]

Sure it could be an air intake leak (extra air sneaking in between the carb and the intake, usually through some disconnected, split or cracked rubbery bit), a clogged fuel filter, a tank full of crappy, soured or watery gas, or even some ignition or other electrical gremlins, but far more likely it's just a cloggy carb jet.

As the old adage dictates: Easiest first! Before you release the diagnostic hounds, go get yourself a 12 ounce bottle of Seafoam at Wallyworld and enough good fresh gasoline to top off the tank. Dump the entire bottle of Seafoam into the tank and top off with the gas. Start and just let it run at idle with the odd rev for 15 minutes or so. Is there even a modest improvement? Swell. Now turn it off and go away and let it marinate overnight. The Seafoam mostly works while you sleep. Next day start her up again, lightly revving occasionally to use all the carb jets. If you think you can safely take her for a nice long ride at varied speeds, do so. Otherwise, go away and come back tomorrow and repeat until she's feeling at least "minimally roadworthy." That Seafoam alone might well cure her after a good long run and some more fresh gas, preferably from a different place you got the last tankful. If not, you can now release those hounds.

Sadly, with the ethanol-adulterated spew we call "gasoline" nowadays, those cloggy ethanol-snots are a far too common issue. If you can find ethanol-free gas nearby, use it. An ounce or two of Marvel Mystery Oil in each tankful also really helps keep the ethanol snots and combustion chamber crudlets at bay, and is a bit less "aggressive" than Seafoam. Think Raisin Bran instead of an enema.

Good luck!

 

[csbrooks1984]

It's an EFI bike so no carbs to deal with...

 

[Bilgemaster]

It's an EFI bike so no carbs to deal with...

Right you are. Still could be "cloggy" though at the idle port, transfer ports, or slow air jet. It could be a host of other gremlins too, but try the Sea Foam first.

 

[Critter]

Check the screen in the fuel selector also the fuel filter if you have one.

 

[csbrooks1984]

So update...went and started it today and reved up fine. Tom it for a short spin and ride like normal??? For now at least... Will throw some seafoam in either way but no idea what the issue was???

 

[Bilgemaster]

Like I said, what you described could have had several causes, but your most common gremlin is gonna be some species of "cloggery": in the jets (carbs), ports (EFI), fuel tap or some other filter screen--Somewhere it ain't flowing as it should. Could also be condensed water or rust or other crudlets in the tank, but gas with ethanol that's sat for even a couple of weeks will commence fouling, really attracting water and thereby forming a lovely snot that'll soon goob up something. When that snot fossilizes it resembles that Sugar-in-the-Raw stuff you get at Starbucks.

Unless it's left too long, an overdosing 12 ounce shock treatment with SeaFoam will often budge the cruds enough to begin purging them. A steady diet of it as directed or, better yet, an ounce or two of Marvel Mystery Oil in each tankful of fuel (about 4 ounces per 10 gallons) will more gently keep those ethanol crudlets at bay, and also do your combustion chamber, valves and seats the power of good.

One last fuel tip: if you pull up to the gas station and the tanker truck is there or just leaving, GO TO ANOTHER STATION! When that fuel's gushing in it'll kick up whatever cruds and other impurities were just laying around in the bottom of that underground tank--stuff you don't want in YOUR tank, whether it's a bike, car or diesel-powered sump pump. If that truck's there, be elsewhere.

Glad to hear your bike's on the mend!