Low RPM acceleration in traffic - jumpy/slipping/whats going on

[rozbabbo1100_imp]

afternoon everyone, 850 miles on 2014 CB1100 since this April and i love this thing. quick question about the throttle feel, hesitation, jumpy-ness characteristics of this bike that i have noticed so far.

--at low rpm's in traffic...mainly in 1st or 2nd gear if i accelerate very slowly (snails pace) i feel like the bike is hesitating and/or the clutch is slipping. This happens between 2-15 mph i would say. The moment you give it more throttle there is no issue. its just at initial calm acceleration.

--jumpy. Seems like with very little throttle movement at low rpm's results in quite the jumpy reaction. There almost feels like there is a "thud" sort of reaction once you let off the gas and when you back into the gas while in gear after slowing down (not using the clutch).

I have been babying this bike before its first oil change so that i dont have any issues with engine/tranny break-in. i have only brought it up to 5k rpms a few times and it is nice and healthy. Seeing this thing is sort of brand new (2014 with 0 miles on it when i bought it in Feb) i feel like i shouldn't be experiencing any of this? This is the newest bike i have ever owned...the other bike is a 1980. I did some searching on here for similar issues...found a couple things where it is mentioned but not a lot.

Am i over reacting? Should i call the dealer? i guess im just used to the "old" stuff and haven't ridden anything newer than 2001.

Otherwise this bike is great. Super nimble. Brakes are spot on.

thanks everyone.

[Cormanus]

rozbabbo, there was a fair bit of discussion about it [url=http://cb1100forum.com/forum/showthread.php?tid=2858&highlight=herky]here and [url=http://cb1100forum.com/forum/showthread.php?tid=871]here, although I can't quite remember what conclusions they reached.

[kmoney_imp]

The jumping when on-off throttle is normal for a bike. You're basically alternating between max and minimum drive train slack, so this feeling is normal. When you add up primary, transmission, chain, cush drive, there is actually quite a bit of slack there...

I think a lot of the other fuelling issues are from the relatively poor stock fueling on these bikes (and most other new bikes). I found a Power Commander cured this, but I'm sure you would just get used to it as well.

[rozbabbo1100_imp]

thanks Cormanus. i saw posts for "herky jerky" but had no clue thats what i was looking for. Good read. everything everyone has posted makes sense. i will look into the chain and throttle plays and adjust them accordingly.

i appreciate the fast reply.

[redbirds_imp]

Bypassing the O2 sensor made a difference on my 2013. I thought the fueling was very good at low RPM's for a FI motor but this simple, inexpensive mod made low RPM operation even better.

[kmoney_imp]

That actually is one thing I forgot too, my chain had like 2.5" of slack from delivery, so definetely something to check on your bike as well.

[Gumby 1100_imp]

Bypassing the O2 sensor made a difference on my 2013. I thought the fueling was very good at low RPM's for a FI motor but this simple, inexpensive mod made low RPM operation even better.

+1 on the use of an O2 Sensor Eliminator Plug. It made a massive difference in low speed fueling.

The alternate map that the ECU uses without the O2 Sensor does not shut off fuel abruptly when you roll off the throttle. It makes low speed driving much smoother and safer, especially when in a low speed turn. I used to have to feather the clutch in order to be smooth, but not any more. Now, its like the bike has a "slipper clutch", no more drastic engine braking...much better!

[Riko_imp]

I had these kind of symptoms after a service of my Suzuki Burgman 650.

It turned out to be a spark plug that didn't sit deep enough

[mininsx_imp]

I had the same problems with my '13 model. It just would not run smooth at normal RPM. I bought an O2 eliminator plug and the hesitation and surging magically disappeared.

http://www.ebay.com/sch/i.html?_odkw=o2+...sacat=6000

[AzBob_imp]

The jumping when on-off throttle is normal for a bike. You're basically alternating between max and minimum drive train slack, so this feeling is normal. When you add up primary, transmission, chain, cush drive, there is actually quite a bit of slack there...

I think a lot of the other fuelling issues are from the relatively poor stock fueling on these bikes (and most other new bikes). I found a Power Commander cured this, but I'm sure you would just get used to it as well.

FTFY.

My shaft drive bike doesn't do any of this, which is my favorite part of having a shaft drive (not to mention the lack of having to maintain a chain).