Jerking at low revs

[seth]

@Andre did a lot of in-depth investigations into things .
He knows some great info.
Hopefully he's never far away but I've not spoken to him in a while either.

[Jambo]

Well. I have adjusted the TPS at 1.1kohms and before adjusting I had a reading of 1.23kohms. I also drained all power from system.

Bike runs much worst than before. Should I try to adjust STPS too? What does the STPS do?

Cheers

[seth]

Have you balanced the throttle bodies yet ?

[grog]

Jambo, sorry its still no good. Very much reminding me same story a local member had, He tried eveything. Turned out was blocked injectors. He got them cleaned professionally, problem solved. BJ it was. Send him a PM, very helpful person.

[DP1400]

Sounds odd to me. The bike was running ok before it was serviced? Then you need to find out exactly what they did during that service. Clearly it wasn`t undertaken by a competent dealership because they changed a sprocket for absolutely no reason!

[BJ]

The following is copied from a post I did some time ago
After checking and setting everything and still having problems I had the injectors professionally cleaned.

"So, leads one and four will fire cylinder 1 but neither will fire cylinder 4.
Switched plugs between 1 and 4. Same result.
Conclusion, not electrical.
Put the Carbtune vac gauges on and cylinder 4 was at the top limit and stayed there for a few turns before it started to come down
Cylinder 1 fair bit low and 2 & 3 hovering around the middle.
Wound down cyl 4 and up on 1.
Was amazed at two things.
A - the vac gauges were soooooooo easy to adjust which would have to be from the extra clean injectors.
B - bike runs like a charm.
I recall that the guy who cleaned my injectors said one was very dirty and I think he had it in the sonic cleaner for five hours.
My advice - If you clean injectors then vac the throttle bodies as part of reinstalling.

My bike has been running like shit for about three years so I'm hoping this will be the solution
(PS the bike has been running faultless ever since)

Other part of the story.
About 18 mths previously the bike was in the Stealership (I requested) and they said they had the injectors cleaned. I had to use an impact driver with hammer to release the two screws that hold the fuel rail. Those little f#@$kers were tight. The screw heads were unmarked and there is no way they had been out before. The bastards never had them cleaned.
I replaced them with stainless bolts so can use a ring spanner to loosen."

[Eric GSX1400K3]

Other part of the story.
About 18 mths previously the bike was in the Stealership (I requested) and they said they had the injectors cleaned. I had to use an impact driver with hammer to release the two screws that hold the fuel rail. Those little f#@$kers were tight. The screw heads were unmarked and there is no way they had been out before. The bastards never had them cleaned.
I replaced them with stainless bolts so can use a ring spanner to loosen."

Excellent advice BJ, and another example of why stealerships are to be avoided at all costs when it comes to servicing or mechanicking.

[Jambo]

I recalibrated the throttle bodies and bike runs smooth again. Also, for some reason, with idle @1200rpm bike runs even smoother. I can have fun now and not worry about it.
Bike makes a new sound from engine. The only thing I can say is that it's a hollow sound...

Cheers guys

[KiwiCol]

Hmmm, check your oil level.

[grog]

Jambo, glad its fixed. No idea about your noise. Ear plugs are great things.

[Jambo]

Hmmm, check your oil level.

KiwiCol, oil level is good.

Jambo, glad its fixed. No idea about your noise. Ear plugs are great things.

grog, no need for that. I now why the bike was making a hollow sound.

I have removed PAIRs and fitted some Smart moto plates. You can find them at smartmoto-electronics. They ship them from greece. while I was doing this, I noticed that, the large hose that comes from the airbox to PAIR valve was already disconnected. The hollow sound was coming from that sucking hole in the airbox. This happened while I was fideling with the TPS connector.

Cheers

[grog]

Perfect result Mate. That hose and breather hose very near each other. Yrs ago i wanted to try blocking PAIRS just to try , i blocked wrong one. You wouldnt believe how much smoke a 14 can create after 5ks without breathing system.