stutter when opening throttle

[gsxbarmy]

Tea Bag! -  All your symptoms I had on my '03

OK - I'll teabag it at the weekend 

http://gsx1400owners.org/forum/index.php?topic=430.0

[DTTW]

Sorry for replying to old topic, but this is to update the situation what I had earlier. You can read the symptoms from my previous post in this topic.

The problem for me was as simple as having the fuel tank overflow hose clogged by the cap that should be on the hose coming from air filter. Switched the cap to that and now it runs MUCH better. Anyhow as there has been probably issue with the engine being tuned with this set up it needs to go back to Dyno. There is still light hesitation, but most of it is gone.

Not sure how the above has happened but when removing the cap there was plenty of rusty water coming from the overflow hose, not good. Anyhow something to check on your bikes as well.

[seth]

It's amazing how a small thing can cause so much bother glad it's sorted now.

[shanered6]

I had a similar issue and it was the after market air filter not giving the bike enough air , changed it and it was 100 % again 

[DTTW]

Thanks shanered6, I also have an aftermarket filter. I think the diameter of the inlet on the aftermarket one is less than the original part. Will change that to original.

[Bradders]

Sorry for replying to old topic, but this is to update the situation what I had earlier. You can read the symptoms from my previous post in this topic.

The problem for me was as simple as having the fuel tank overflow hose clogged by the cap that should be on the hose coming from air filter. Switched the cap to that and now it runs MUCH better. Anyhow as there has been probably issue with the engine being tuned with this set up it needs to go back to Dyno. There is still light hesitation, but most of it is gone.

Not sure how the above has happened but when removing the cap there was plenty of rusty water coming from the overflow hose, not good. Anyhow something to check on your bikes as well.

Hi DDTW,

I've had minor stuttering when accelerating from low speed it's intermittent and bike bikes runs sweet apart from that. I've balanced the TBs, set both TPSs as suggested, I did clean the fuel filter and I have finally taken the plunge and done the external fuel filter mod. This improved the power and general running of my which is stock, but I still get these little stutters at times when accelerating. I'm curious what you did with th breather hose as I'm running out of ideas. Doesn't the breather hose just hang loose in the bike? Mine always has, in fact I've never seen the far end! Only had the bike a short time and I didn't consider that a breather hose could cause such issues, makes sense I suppose or the fuel tank might implode! Where did you connect your breathe too?

Thanks

[Eric GSX1400K3]

Also, have a search on here. The TPS and STPS  can wear out. The track inside the sensor can corroded, causing spurious signals to the ECU.  I've changed both STPS and TPS, plus done all of the above, and all my hesitation and stutter has gone. 

[grog]

Eric, i agree👍If mine ever gives those sort of probs, basic checks first but TPS must wear out, that contact moves up & down every throttle movement, would cover a bit of distance over a few years.Not real cheap but if it works, its good value👍

[Andre]

+1 on the TPS/STPS wear out.

I'm curious what you did with th breather hose as I'm running out of ideas. Doesn't the breather hose just hang loose in the bike? Mine always has, in fact I've never seen the far end! Only had the bike a short time and I didn't consider that a breather hose could cause such issues, makes sense I suppose or the fuel tank might implode! Where did you connect your breathe too?

It's a common misunderstanding to think that this is a breather hose. It is just a Water Drain Hose. In my case more a spilled fuel hose (when I spill while topping of at the station). The tank breathing works through the tank lid.

The one end of the hose connects to the tank. The other end hangs loose.See the drawings for the routing (from page 8-26 workshop manual)

[Bradders]

+1 on the TPS/STPS wear out.

I'm curious what you did with th breather hose as I'm running out of ideas. Doesn't the breather hose just hang loose in the bike? Mine always has, in fact I've never seen the far end! Only had the bike a short time and I didn't consider that a breather hose could cause such issues, makes sense I suppose or the fuel tank might implode! Where did you connect your breathe too?

It's a common misunderstanding to think that this is a breather hose. It is just a Water Drain Hose. In my case more a spilled fuel hose (when I spill while topping of at the station). The tank breathing works through the tank lid.

The one end of the hose connects to the tank. The other end hangs loose.See the drawings for the routing (from page 8-26 workshop manual)

Brilliant, thanks guys, I'll take a look at this, I'm fairly certain my drain isn't wheee it supposed to be. I was thinking last night to retry the TPS/STPS again.