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Discussion Starter #1
The XR starts fine and seems to idle fine. Took her out yesterday for the 1st time on probably 3-4 months. (bike has around 3,000 miles on her). Having the following problem.
On road running in normal traffic; Reasonable attempts at acceleration (in any gear) causes bike to cough, sputter and back-fire. After which some times opening throttle at rest takes a while to "clear out". Even got to the point that any acceleration (slow or fast) caused an issue. Note that running at higher RPM in low gear (say 3k or so) have eventually "cleared in out" for a short time.

By the way, I live in South Florida so higher humidity. Temperature has been in the mid 70's.

I am guessing that it is either;
Fuel gone bad -
Plugs fouled -
Injectors fouled -
or some electrical problem that just coincidentally materialized.

Back-fire sounds like timing (firing when exhaust valve open?) but could be another reason of course. No reason timing should be off.

Any suggestions?

Thanks.
 

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In addition to bad fuel I'm thinking fuel filter plugging up but with only 3k miles on it that seems a bit remote. The IAC needs to be reset. A dirty throttle body.

But my first check would be to remove the battery terminal connections, clean them with a wire brush, then reinstall. Check to see how it runs then.
 

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May want to check the air filter as well, something may have made a home out of it after sitting so long. I thought my 2011 XR was low mileage with 15k on it but it looks like I have been beat.
 

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If you did not put a stabilizer in the fuel the last time you rode it, the gas has lost its volatility and also has separated. Siphon it out and replace with fresh gas and add the proper amount of Seafoam.
Bbob's battery suggestion should be followed too. Only I would add; Remove the battery bolts and place lock washers under the heads as they have a tendency to loosen.
After you've done that, take her out and after a complete warm up, accelerate up to just this side of 5K rpm a few times and report back.
 

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nealflora

You haven't said it the bike bone stock. Or have you changed something
 

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Discussion Starter #7
Cleaned the Batt terminals (were clean but did it anyway). Pulled plugs to check Gap (was .036 Manual sales .032 to I re gaped). Plugs were slightly sooty (not light tan) but I suspect that's normal for the bike.

Don't know what
"IAC Reset" is?

Bike has Stage 1 setup from dealer. Batt is kept on a Trickle charge when not in use.

Slight change in symptoms (don't know if random or due to cleaning Batt terminals)
Took it out this morning. Normal running around town (up to maybe 40 mph) seemed fine until I "hit it" with a quick throttle acceleration. Chokes and bogs down.

If it were "bad gas" I would not expect it to be normal at slower; speeds and acceleration.

Of course, I will "drain and replace" anyway if you guys think it best. Also will remove tank and check Air Filter. Again, with normal performance at slower street speeds, I would doubt a fouled air filter.

All suggestions welcome!
 

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Sitting for any period of time is bad for an engine. They don't like it. Flush the fuel system and RIDE, RIDE, RIDE. Get out on the freeway and ride 100 miles at 70 non-stop. It'll burn out.
 

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My bike sits for 5 months with out starting it and its on a battery tender all the time. Yes in spring I ride and there is not the normal power till it gets new gas.
First off get new spark plugs and even plug wires. ( witchdoctor ) sells them.
 

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Discussion Starter #11
Thanks for the Video Bob. Good info.
Got just a little more info.
Took her out today for a longer run (maybe 1 hr). Interesting... Any gear if the throttle is opened slowly everything seems fine. Ran her in all gears up to about 3,500 RPM (didn't go above 3,500 but I will) with no issues (4th to 70 mph). If I jump on the throttle quickly (again in any gear), it act's like its starving for Gas (or Air).

I assume the bike works the same as any EFI system and opening the throttle, more air, higher fuel demand.

Possibilities?
Low Fuel Pressure - Quick throttle needs quick response from injectors.
Still bad gas - dumping more bad gas quickly.
Air Filter - Throttle body opens fast (mechanical I believe) but Air Filter not delivering enough Air to keep up
Injectors sticky from sitting - Not likely but possible (gas has not been setting for that long, 3-4 mo)
Computer not doing something right - I sure hope not, that the one think I can't fix nor test.

With the symptoms, any other thoughts out there?
Thanks
 

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Change out the gas and then do a ride and report. If its still doing the same thing on fresh gas, there are things we can suggest. I suggested you siphon out all the old gas and add the proper amount of Seafoam to the new gas.
 

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The way you're describing it it sounds more like a fuel pressure/pump issue than anything. Could be the fuel filter too.. if you had some funky stuff in the tank while it sat the filter just might not be passing enough gas to feed the bike when you whack the throttle open. You can check the fuel rail pressure pretty easy overall, rent the gauge from a parts store if you have to.
 

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He really needs to replace the old gas with fresh and ride it before anything else. Add some Seafoam too.
 

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He really needs to replace the old gas with fresh and ride it before anything else. Add some Seafoam too.
Someone else mentioned a product called K-100 deposit dissolver and fuel stabilizer that looks like it might be worth a try. The person mentioned it's more robust than Seafoam which I too have used for years and like a lot. Looks like the K-100 would be good to put in before the vehicle sits for an extended time; up to two years.

[ame]https://www.amazon.com/K-100-K100mg-Oz-Bottle-8oz/dp/B008Y2CH84/ref=pd_day0_263_4?_encoding=UTF8&pd_rd_i=B008Y2CH84&pd_rd_r=HPABMD6BV1G0PSRXK7E8&pd_rd_w=DApKs&pd_rd_wg=WFINU&psc=1&refRID=HPABMD6BV1G0PSRXK7E8&dpID=41cJ%252BFYnL2L&preST=_SY300_QL70_&dpSrc=detail[/ame]
 

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You say ( like its starving for Gas ) do the RPMs go up and the bike just doesn't move as fast.

Did you get new spark plugs and wires
 

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Discussion Starter #19
Continuing Saga

Sorry for taking so long to report back.
Drained gas, filled up with new gas.

Took her for a run (about 1 hr). For the most part ran fine with the exception of still missing some when full throttle applied in any gear at any speed although much better than it was.

Will run her a few more times on the open road and see if it continues to improve and report back
 

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My bike sits for 5 months with out starting it and its on a battery tender all the time. Yes in spring I ride and there is not the normal power till it gets new gas.
First off get new spark plugs and even plug wires. ( witchdoctor ) sells them.
Yep for the price of new spark plugs Id be throwing a new set in as well as the best gasoline you can get with whatever best additive is ..evidently seafoam from what I hear in here.
Now comes the best part
Ride it
 
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