Attention all K6&K7 GSXR 600 and 750 owners

**Kendog** · 27th May 2007, 09:12

I have been following with interest the so called "Herky Jerky" throttle syndrom on the Gixxer.com site.

What is that you may ask, here is a pretty good description:
Upon the bikes first start up of the day it runs flawless with smooth power delivery and a responsive throttle from inputs of 0% to 100%. After the bike has reached its normal operating temperature, if at any time the bike is shut off, for example to fuel up, the throttle is very choppy and the bike does not run smoothly at all. It seems there is no happy medium between the throttle being on or off. This happens at any speed, gear or throttle position and seems to be brought on by heat.

I believe I have experienced this once on my bike, where the engine would seemingly loose power with the slightest roll off on the throttle.

Over the last few days there has been a possible breakthrough as to the cause and fix for this fault.
"So the part that ended up being on warranty was the solenoid attached to the fuel rail which controls the butterfly valves on the throttle bodies. I figured a couple hundred bucks to replace.... dead wrong. The entire fuel rail has to be ordered as a unit which came to a hefty price tag of $1750 CAN, not including labour. Obviously the throttle bodies had to be syncronized which I believe has lead to a smoother fuel delivery.
End result... get those fucking bikes into your mechanics/dealerships and get them to check the solenoid attached to the fuel rail... its on the TPS side. Mine was not cycling properly which constituted a wide array of problems from the butterfly valves being stuck at a certain location regardless of throttle position. As you can probably imagine, the vacume was also messed up along with the amount of fuel the bike is dumping into the cylinders' hence the ECU cutting the fuel prematurly so the bike doesn't detonate."

For more info check out this thread. It has links to several other threads describing the problem and from page 28 it starts talking about the fix.

Don't write this off as bad riding, or something you have to live with. If your bike has this problem, check out the thread above and contact your service department (especially before your warranty runs out)

**jimbo600** · 27th May 2007, 10:04

Well I've experienced a choppy throttle at very low revs in the first few gears. Only a problem when going through towns. It's not there in the higher gears which leads me to believe its something to do with the timing retard in 1, 2, 3, 4th. Only had one example of the the SET valve not cycling properly and Welly MC's picked that up. Other than that its fine.

You'll find the yanks on that site are pretty paranoid. Virtually all of them have removed their SET valves and are experiencing problems.

I'm fitting a TRE and I'll let you know how it fairs.

**Leong** · 27th May 2007, 11:14

Originally Posted by Kendog

I have been following with interest the so called "Herky Jerky" throttle syndrom on the Gixxer.com site.

What is that you may ask, here is a pretty good description:
Upon the bikes first start up of the day it runs flawless with smooth power delivery and a responsive throttle from inputs of 0% to 100%. After the bike has reached its normal operating temperature, if at any time the bike is shut off, for example to fuel up, the throttle is very choppy and the bike does not run smoothly at all. It seems there is no happy medium between the throttle being on or off. This happens at any speed, gear or throttle position and seems to be brought on by heat.
................. If your bike has this problem, check out the thread above and contact your service department (especially before your warranty runs out)

Thats a perfect description of the problem I have. Often happens after a refuel... I thought it was the type of fuel at one time, but it isn't.

Only have a 1 year warranty on mine, runs out 17 July 2007. Thanks for the link!!

**Sensei** · 27th May 2007, 14:52

Noticed this on a 06 GSXR750 I road awhile back as well , unexceptable for a Jap bike .

**White trash** · 27th May 2007, 14:57

Rev it you poofters.

**jimbo600** · 27th May 2007, 15:54

Originally Posted by White trash

Rev it you poofters.

Oath. No probs on mine when its banging off the limiter with the shift light blinking like a strobe.

**Trudes** · 27th May 2007, 16:25

Yeah that was my reply too, "you just need to learn to ride it and not roll the throttle off mid corner...."

BUT.. I have been informed it's not like that....

**jimbo600** · 27th May 2007, 16:28

Originally Posted by Mrs Kendog

Yeah that was my reply too, "you just need to learn to ride it and not roll the throttle off mid corner...."

BUT.. I have been informed it's not like that....

Hm I'll have to have a whirl on Mr Kd's and see if its like mine.

**Trudes** · 27th May 2007, 16:31

Originally Posted by jimbo600

Hm I'll have to have a whirl on Mr Kd's and see if its like mine.

That excuse works well for me! "You're talking shit, here I'll ride it and see if it does it to me", lol! I have a funny feeling he'd be scared to let you ride it, he's seen what you do on yours!! (although there's some video being made at the mo, and I think he'd like some wheelie footage!!)

**cowpoos** · 27th May 2007, 16:38

Originally Posted by jimbo600

Oath. No probs on mine when its banging off the limiter with the shift light blinking like a strobe.

practising your hill starts again fella?

**Kendog** · 27th May 2007, 17:01

Originally Posted by jimbo600

Hm I'll have to have a whirl on Mr Kd's and see if its like mine.

Then you may want to change your name to jimbo750

I did notice some throttle jerkiness today when I rushed the start the bike and ride bit. It does seem to make a difference letting the bike finish its ignition 'thing cycle' before riding.

**Devil** · 27th May 2007, 17:04

Found this problem on the K6 600, GSR600 and Bandit 1250. Seems Suzuki needs to get their fueling sorted out.

**jimbo600** · 27th May 2007, 17:42

Originally Posted by cowpoos

practising your hill starts again fella?

Yeah and I still stall it. I either launch too early or can't get it going. Bit like when I'm rootin' really

**jimbo600** · 27th May 2007, 17:45

Originally Posted by Kendog

Then you may want to change your name to jimbo750

I did notice some throttle jerkiness today when I rushed the start the bike and ride bit. It does seem to make a difference letting the bike finish its ignition 'thing cycle' before riding.

Always let the bike finish its ignition cycle. Firing the bike before its ready can put the set valve and TPS sync out. Its sorts itself if you turn it off and on again though.