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Discussion Starter #1
I left work today after bike sitting in sun from 7:45 to 3:45 around 83 degrees. It is the 2012 Vstrom 650 Adventure model with approx. 7500 miles. The engine is all stock and I have not removed the tank yet. I have a full tank with maybe 15 miles since I filled up. I rode in to work this morning and no problems whatsoever.

After work I started the bike up, let it idle for about 2 minutes, then rode off. I went about a mile and the bike felt like it was hesitating. As I was coming to a stop for a light, it stalled. I let out the clutch and it started again but idle was slightly erratic. As I rode away from the light and got into 2nd it started to hesitate then died. I coasted into a parking lot and put in neutral. I went to start and it hesitated a few seconds then it started. I rode the rest of my 7 mile commute home with 2 additional stalls and some occasional hesitation.

Something similar happened a year ago with around 2k miles on the clock and I believe I wrote it off to bad fuel. It ran noticeably rougher at idle and on accel and had a slight loss of power. After I filled up the problem almost immediately went away. I have since taken the bike on a 2k mile trip up Blue Ridge and back with no issues and commuted for most of a year until today.

I'm thinking maybe bad gas again, but I also wonder if I have a faulty sensor or something?!? Any thoughts?
 

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FORUM GODFATHER.....R.I.P. PAT
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After work I started the bike up, let it idle for about 2 minutes............... Any thoughts?
Don't do that. Start it up and ride right away. Just keep it under 5000rpm or so until you get a coolant warmth bar or two. Cold idling normally just wastes fuel and increases pollution but it can overheat the tank and throttle bodies and cause vapor lock in a perfect storm of conditions. Riding with a light load like under 5000 rpm warms the bike up faster and prevents uneven heating of components.

Heat in the tank from sitting over a hot engine, sun exposure or high ambient air temperature can also cause excess fuel vapor in the intakes. If the starter spins but the engine doesn't fire right away, open the throttle to let in more air until it starts to fire.
 

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I went about a mile and the bike felt like it was hesitating. As I was coming to a stop for a light, it stalled.
I think the "perfect storm" would have passed after he was down the road a mile. I agree there's no need to warm up these bikes before riding. Heck, I don't even let the gauges finish their dance before I take off. Considering this started reasonably soon after a fill-up, I'm with the OP's theory: bad gas.
 

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FORUM GODFATHER.....R.I.P. PAT
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I don't know why it is, but if the original start up was not done well. people report the continuation of poor running for a while.
 

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A lot of people try to attribute problems with bad gas, I've even done so myself but is there such a thing as "bad gas" anymore?
 

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A lot of people try to attribute problems with bad gas, I've even done so myself but is there such a thing as "bad gas" anymore?
Oh hell yeah. Dirty fuel left to sit in storage for too long with water contamination can happen anywhere though it's more likely at old stations with little traffic or right after the tanker fills up the underground storage tanks. That's not accounting for the rare occasion that a station owner doesn't top off the storage tanks with old paint thinners or some other thing they picked up cheap, or even a mistake made in final blending at the refinery. I've heard of the former happening but only once (paint thinners in diesel from memory), and the latter shouldn't be considered impossible though it's pretty unlikely with modern QC in place.
 

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Discussion Starter #8
UPDATE: Thanks for the replies everyone. I rode in to work this morning with nary a hiccup(bike kept in garage and 75 degrees for the commute). However, after work I ran into the same problem(sort of). I tried Greywolf's suggestion and geared up first, then started the bike. Conditions essentially the same as yesterday(mid 80's and sunny, bike sat in sun all day). I immediately rode off today and right around a mile away I started to get an inconsistent hesitation. It felt like it was going to die, but today it never did.

The hesitation occurred a number of times at different RPM's mainly light throttle (and between 3-5k)until I stopped about 6 miles away(maybe 15 minutes). I shopped for 15 minutes, then hopped back on and rode 10 minutes home. I did not have any additional problems on my trip home after the stop. It didn't feel like it was running perfectly, but it didn't jerk like the fuel was cut as it felt like when I left work.

I have gone 38 miles since filling up. Fuel was purchased at Sam's Club and is the 87 octane variety. I have been purchasing fuel for both of my bikes and my truck at this same location for the last year with no issues. Previous time I had issues the fuel was purchased at Sunoco.
 

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I didn't read the whole thread but have you tried Seafoam or anything similar?
 

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Discussion Starter #10
I didn't read the whole thread but have you tried Seafoam or anything similar?
Nope- just standard 87 octane from the local Sam's Club(warehouse club similar to Costco, BJ's or Price Club). Fuel turnover is tremendous at these clubs. I have been using their gas in my vehicles including all of my motorcycles for about 12 years now without a problem.

I'm not a big fan of additives mainly because I have never used them...
 

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Fuel system venting issue? On a hot day, if the fuel tank is not venting properly, the result can be poor starting and stalling. Just a guess.
 

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Re Gas

I like the info on these forums> I have a 2012 650 V strom, I am from Canada and my owners manual specified to use regular gas, Unless I travelled into the US. then it says to use a mid grade or premium fuel.
 

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That's odd. The USA and Canada use the same fuel ratings. Regular works fine in both countries.
 
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