Jerky throttle

**f2dz** · 11th February 2015, 11:51

I've had this problem for a few months on my 2007 GSXR750 where the throttle is very jerky at certain RPMs.

It's worst in 2nd gear but it also occurs in all the others, it just lessens the higher you go - I guess due to the subsequent gears being taller and taller.

So when rolling off in 2nd gear the throttle just cuts when the bike passes 4k or so. It has done this as high as 6k but with a similar amount of rolloff in terms of the throttle position itself. It also abruptly comes on when accelerating once the throttle is in a similar position when getting on the gas.

I've done some reading on Suzuki forums and people suggest adjusting the throttle position sensor (TPS), which I have already done to no avail. My chain is also properly adjusted. Next I'm going to try reducing the amount of freeplay in the throttle cable itself but I may just be clutching at straws here.

People on those forums also talk about 'herky jerky throttle' which appears to be similar but also occurs at constant throttle at higher RPM. My bike only does it when decelerating and accelerating through this lower rev range of 4-6k.

Anyone else experienced anything like this?

**BuzzardNZ** · 11th February 2015, 12:00

Try that ( TPS ) and get a TEKA tune to sort out the EFI.

Did the above on my SV and it sorted the problem out.

**caspernz** · 11th February 2015, 12:07

My first question would be are the services up to date?

**ducatilover** · 11th February 2015, 12:13

Could be as lean as fk. Air leak etc
Or your T/Bs are out of sync, because they do go out of syc ad is commonly overlooked

**f2dz** · 11th February 2015, 12:32

Originally Posted by BuzzardNZ

Try that ( TPS ) and get a TEKA tune to sort out the EFI.

Did the above on my SV and it sorted the problem out.

I've adjusted the TPS already and it didn't help. Where did you get the TEKA tune done? I quickly searched up that there's a guy in Kumeu that can do em. Was yours expensive?

Originally Posted by caspernz

My first question would be are the services up to date?

Yes they are. It was last serviced within a couple thousand kms.

Originally Posted by ducatilover

Could be as lean as fk. Air leak etc
Or your T/Bs are out of sync, because they do go out of syc ad is commonly overlooked

Hrm, I'll keep this in mind. Cheers.

**BuzzardNZ** · 11th February 2015, 12:42

Originally Posted by f2dz

I've adjusted the TPS already and it didn't help. Where did you get the TEKA tune done? I quickly searched up that there's a guy in Kumeu that can do em. Was yours expensive?

Can't remember how much it cost, but if you are going to do the TEKA, you might want to consider after market pipes and an after market air-filter ( I got a BMC ) and get it dynoed and TEKA tune all in one go.

I got mine done at Wellington Motorcycles and was very pleased with the results. Felt like a different bike ( way better mid range power and smoother ) but fuel economy went way down.

**Stirts** · 11th February 2015, 13:08

Your bike hates you...you should give it to me

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**kiwi-on-wheels** · 11th February 2015, 15:30

I'd be looking at plugs coils etc, low rpm spark breakdown perhaps?

**eelracing** · 11th February 2015, 16:21

Originally Posted by f2dz

I've had this problem for a few months on my 2007 GSXR750 where the throttle is very jerky at certain RPMs.

It'Next I'm going to try reducing the amount of freeplay in the throttle cable itself but I may just be clutching at straws here.

Anyone else experienced anything like this?

They all do it to some extent.Definately do the above and ride her higher up in the revs...sorted.

**Akzle** · 11th February 2015, 18:31

well, since you've said chain...

carb choon.

**Big Dog** · 11th February 2015, 18:32

Is this the stock air box and exhaust?

Stupid phone / Tapatalk, apologies in advance.

**Big Dog** · 11th February 2015, 18:33

Originally Posted by Akzle

well, since you've said chain...

carb choon.

07 should be injected.

Stupid phone / Tapatalk, apologies in advance.

**nzspokes** · 11th February 2015, 18:37

Originally Posted by Big Dog

Is this the stock air box and exhaust?

Stupid phone / Tapatalk, apologies in advance.

The bike is stock. I have ridden it. Nice bit of kit.

**Big Dog** · 11th February 2015, 18:45

Filthy big dirty spot at the 5-7k mark variable on gear but repeatable on a stock bike would suggest a faulty / filthy O2 sensor or filter.

Less common would be a faulty / filthy fuel filter. Or the wrong fuel. Bus ran rough on anything other than 91 unless giving it a bit of open road.
The Hayabusa and the GSX1100 both would run rough as guts in spring if not serviced at 6k. Turns out the stock air box drains into a tube. That needs emptying after riding in heavy rain or change of season.

Stupid phone / Tapatalk, apologies in advance.