stumble in 3rd @4000 rpm off idle

[laramie LC4]

took the big girl out for her first real off-road test. was on a mission to find the bottom of a trail we often ride on our smaller bikes. good news is i found the trail and had an awesome ride. bad news is i had a weird stumble multiple times during the ride.

2012 990R w/ 1000 miles on the clock. stumble only happened in 3rd gear @ 4000 rpm when coming on throttle from idle. to give you an example, cruising down an incline, at speed, engine braking at 4000 rpm, completely off throttle, then stumble when i came back on throttle. if i was careful and kept the rpm's higher or was on the gas, never had a problem. had no problems doing the exact same thing in 2nd or 4th gear at same rpm's.

any ideas?

gotta say i'm really digging this bike. got into a few places today where i questioned my wisdom but the bike did remarkably well and comfortable. even with those crappy stock tires.....

thanks,

laramie

[Hipster]

Here's something to look into, see below copied from the OC Hall of Wisdom. Check your wiring diagram to see if your bike also has this feature.



"Electronic Power Control:
KOTH: If you have the Electronic Power Control (EPC) system on your bike (all EU spec bikes 950/990 including early '04 USA), you can disable it by snipping the two wires that tell the ECU that the bike is in 2nd or 3rd gear. These are the gears in which the EPC limits engine acceleration to comply with European noise regulations. If you are not in Europe you likely don't have any noise tests to comply with. You will still want to remove the EPC valves from the 950's as they are subject to malfunctioning even when not connected to electrical. The connector for the gear sensor is #2 in the above photo.
yellow-brown = 3rd gear
gray = 2nd gear

FastEddy760: Pins Removed for Gear Sensor. It is easy, and this will help take the guess work out of the process.
1. Left side, follow wires from the gearshift and the side stand sensor (#2 in above photo).
2. Disconnect the plug, and put the side stand end to the side, it fits nicely over the flywheel cover, and out of the way.
3. You will be working on the end with the gray, yellow/brown, and green/black wires.
4. Use a small jewelers screwdriver inserted into the plug, and a little tension on the wire, to pop out the female leads for the gray and yellow/brown wires. Leave the green/black wire connector alone.
5. Cover the wires with shrink tube so they wont ground out.
6. Plug back together so the neutral switch will still work."

[laramie LC4]

by item #2, i assume they are talking about this pic?



i will check this out. any other possible issues with doing this?

thanks again,

laramie

[catalina38]

Since he doesn't have a EU spec bike or an early 2004 950 that stuff doesn't really apply per the the HOW stuff quoted.
The EPC can be unchecked via Tune ECU if it was enabled, the several newer 990's I have looked at the EPC wasn't enabled. I have the 2012 "R" map on my 2010 990R without and of his complaints. It shouldn't be fuel filters with that low mileage, maybe the side stand is bouncing around and triggering the safety switch.

[laramie LC4]

Originally Posted by catalina38

It shouldn't be fuel filters with that low mileage, maybe the side stand is bouncing around and triggering the safety switch.

thought about that. i hope i don't have issues with that already. i will check the side stand. i just added a BDC re-locator a few ago and will confirm that nothing is a stray.

Since he doesn't have a EU spec bike or an early 2004 950 that stuff doesn't really apply per the the HOW stuff quoted.
The EPC can be unchecked via Tune ECU if it was enabled, the several newer 990's I have looked at the EPC wasn't enabled. I have the 2012 "R" map on my 2010 990R without and of his complaints.

in the previous post it it made to sound like this is possible for all 990's and simply removing these connections is a "no harm, no foul" way to eliminate an issue for all bikes? i'm all for that, but also know to not believe everything you read on the internet.

thanks again guys,

laramie

[FtheRedSticker]

I'm new to the adventure but I find that besides first gear, my 950 prefers to run near or above 4k rpm. It likes to rev high and doesn't lug like a traditional thumper.

[Hipster]

No, there's a 3 pin connector located on the left side of the bike near the bottom of the gas tank. However, as stated, newer US 990's may not have this feature active.
[QUOTE=laramie LC4;20389088]by item #2, i assume they are talking about this pic?[QUOTE]

[laramie LC4]

i have a skid plate coming in today so i planned on pulling everything and having a look. i will see if i can find this plug and see what the dealership has to say about it.

thanks again,

laramie