Cold Stumble

[Joflewbyu2]

I've been using the Boosterplug for a couple years. It does work!

https://www.boosterplug.com/shop/hon...ries-53c1.html

That tricks the ECM in thinking the air temperature is cooler/denser than it really is and enriching the fuel ratio. Simple cheap resistor on the air temperature sensor. The other simple way would be to put a resistor on the oxygen sensor to trick the ECM to think the outgoing exhaust is too lean so the ECM adds more fuel to enrichen the air/fuel ratio.

I added fuel injector cleaner to a tank of fuel and my stumble disappeared. Next fill up will be with ethanol free gas.

[VStarRider]

That tricks the ECM in thinking the air temperature is cooler/denser than it really is and enriching the fuel ratio. Simple cheap resistor on the air temperature sensor. The other simple way would be to put a resistor on the oxygen sensor to trick the ECM to think the outgoing exhaust is too lean so the ECM adds more fuel to enrichen the air/fuel ratio.

I added fuel injector cleaner to a tank of fuel and my stumble disappeared. Next fill up will be with ethanol free gas.

I am not a mechanic or a physicist, but I did stay at Holiday Inn Express in Albany once (very generous continental breakfast and nice rooms).

For whatever it is worth, I read that the ethanol in gas actually serves a cleanser; after all, it is alcohol; and that fuel injector cleaner has become obsolete. I am not saying you or anyone else is wrong, just parroting what I read. In my own experience, ethanol gas is a big no-no in carbureted two-strokes because the cleansing action can free up grime that would otherwise just stay in the bowl or other parts of the carb but get washed away and end up in bad places. This, in turn, can partially plug a jet, creating a lean condition ... and a lean condition on a two-stroke = pistons melting.

[Joflewbyu2]

Please investigate ethanol fuel before making assumptions. With water and vapor issues it is not recommended over ethanol free fuel.

[Donncat]

Gents, on my 2013B I experienced that stumble only on one occasion or should I say for one tank of gas. I have always run premium fuel and after reading other threads I decided to try Mid-Grade gas and the stumble appeared and stayed till I filled up again. If you haven't tried Premium fuel exclusively you might just find the solution there. I do not get any stumble warm or cold, low RPMs or high. Just Sayin.

[VStarRider]

Gents, on my 2013B I experienced that stumble only on one occasion or should I say for one tank of gas. I have always run premium fuel and after reading other threads I decided to try Mid-Grade gas and the stumble appeared and stayed till I filled up again. If you haven't tried Premium fuel exclusively you might just find the solution there. I do not get any stumble warm or cold, low RPMs or high. Just Sayin.

I will start running premium non-ethanol fuel in about a month, anticipating storage. I will have to see if that stumble goes away during those few tankfuls. Ever since this thread came up, I have been paying more attention to the stumble and have noticed that it does not occur during EVERY warm up after all...about every third or fourth.

[F6Bster]

I've followed the posts on this thread and thought several times about replying...but never did until now.

My 2016 F6B can move right out as soon as I start it. I always let it run about 30-60 seconds just to let oil get circulated and I take it easy on the throttle until it gets warmed up. Never have had a stumble. I wonder if it could be that here at 8,500 feet it runs just a little richer because of the thin air and that this helps. I know the ECM makes the adjustment for the altitude, but still could be a little richer than for those at lower elevations.

As for octane, at this elevation regular gas is 85 octane (same anti-ping result as 87 at lower elevations) and that's what I have run for 14k miles, except on a couple of trips that were a little lower in elevation and the regular gas was 87 octane. Have never had pinging on my F6B, even when rolling hard on the throttle.

My 2002 GL1800 Wing performed the same way until I was running back east at lower elevations and HOTTER temperatures -- crank it hard and I would get pinging with 87 octane so I used middle-grade in those cases.

[Zteve]

https://www.boosterplug.com/shop/hon...ries-53c1.html

Id'll fix dat B rite up

[53driver]

https://www.boosterplug.com/shop/hon...ries-53c1.html

Id'll fix dat B rite up

Quite possibly, but I'ma gonna spend about 2x that and get the dang fuel mapping fixed right & proper.
Along with a few other minor things I don't want - like a speed limiter....
Go go gadget Guhl!

Cheers,
Steve

[Sorcerer]

I had my 13 dynoded and the tec told me that the bike ran very lean.

[53driver]

I had my 13 dynoded and the tec told me that the bike ran very lean.

Things that make one go: "Hmmmmmmm"