Jerking fixed switching front sprocket

[Hooli]

In an attempt to eliminate those two switches can I unplug them and run a wire across them and see what happens?

Ish.

Do that to get the bike to start, but test ride it without them switches connected or bypassed. Just doing the clutch switch is enough as it's inline with the sidestand switch (from memory) so disconnecting one takes both out the circuit.

As someone else said, they don't ride right with the switches bypassed. I did it to mine once & it was thirsty as hell, slow & backfired under power.

[Eric GSX1400K3]

I replaced the vacuum lines on mine and that made a huge difference. The lines may look ok but hairline cracks allow false  air that upsets the air fuel ratio  down low. You wont notice it at high rpm as the amount of fresh vs vac air is much higher, but down low it becomes awful to ride.  I replaced the t connectors as well.

I assume you  have checked plugs and leads too?

[gsxbarmy]

@BJ
Don't ride with the clutch/ sidestand switches bypassed as the ecu runs a different map and may make things worse in the way the bike runs .
Check the switches and keep them in the circuits required .
.

Totally agree @seth, but for purposes of checking whether it makes any difference, bypassing them for a short test run would be OK IMO but totally agree that in the longer run, leaving them bypassed is a no no.

[Hooli]

@BJ
Don't ride with the clutch/ sidestand switches bypassed as the ecu runs a different map and may make things worse in the way the bike runs .
Check the switches and keep them in the circuits required .
.

Totally agree @seth, but for purposes of checking whether it makes any difference, bypassing them for a short test run would be OK IMO but totally agree that in the longer run, leaving them bypassed is a no no.

Seems to vary on 14s, but mine rode awful with them bypassed so you still think it's faulty.

[Hooli]

I replaced the vacuum lines on mine and that made a huge difference. The lines may look ok but hairline cracks allow false  air that upsets the air fuel ratio  down low. You wont notice it at high rpm as the amount of fresh vs vac air is much higher, but down low it becomes awful to ride.  I replaced the t connectors as well.

I assume you  have checked plugs and leads too?

Good call, I had to do my vaccuum lines this year too.

Part of the reason you won't notice it at higher speeds  is the ECU doesn't use the MAP sensor (that the vaccuum pipes go to) above a certain rev/throttle opening limit.

[seth]

Vacuum lines is a good shout to check 

[grog]

BJ, what a PIA your bike. So many things replaced, adjusted for no result. I wouldve sold it after all this time trying.  Id set idle at 1100 again, reset TPS after that. I know you like a bit of free play at throttle, Ducati sure have lots of that, yours have it built in, why you like it. 14 needs at close to zero, adjust at top, tight as you can get without affecting revs turning bars to each lock. Have a listen to throttle bodies when closing, make sure you can hear it returning to totally closed, a must. Adjust closing cable to get that click,adjust at bar end.  If no better, give me a ring, will swap bikes to compare.

[Jambo]

I replaced the vacuum lines on mine and that made a huge difference. The lines may look ok but hairline cracks allow false  air that upsets the air fuel ratio  down low. You wont notice it at high rpm as the amount of fresh vs vac air is much higher, but down low it becomes awful to ride.  I replaced the t connectors as well.

I assume you  have checked plugs and leads too?

Your problem may be electrical, on the 14, the clutch switch (as we all know) can cause issues, for the cost, may be worth replacing that? Alternatively, if you take your one off, there is a small hole underneath, spray some contact cleaner in there.

I can't seem to find a clutch switch. Is it on this section?
https://www.moto-pecas-suz.com/suzuki-motociclos/1400-MOTO/GSX/2002/GSX1400K2-E2-/ELECTRICO/FEIXE-ELECTRICO-GSX1400K2-UK2-K3-UK3-/7/3099857/E/1355

Dropping to a 16t front sprocket is going to knock around 20mph off top speed. You'll struggle to hit 120. Not my idea of a "Fix" to the problem.

You're right! it is insane. It may have the advantage of being very quik through the gears. Good for drag racing I suppose.

Vacuum lines is a good shout to check 

I don't actually know what Vacuum lines are for now. But would they be here?
https://www.moto-pecas-suz.com/suzuki-motociclos/1400-MOTO/GSX/2002/GSX1400K2-E2-/MOTOR-TRANSMISSAO/MANGUEIRA--JUNTA-DO-CORPO-DO-ACELERADOR-MODELE-K2-/7/3099282/M/1355

I assume you  have checked plugs and leads too?

New plugs were fitted. How does one checks the leads? visual inspection? look for cracks?


Guys this all makes sence, since we are talking about an 18 year old bike. which has everything still stock by the looks of it, hoses and lines.
One thing I am really happy with is the fact that not a single drop of oil comes out the block, engine is immaculate. Only oil I can find has come from chain. Most people just add oil to the chain. Years of this conduct will accumulate oil on front sprocket cover.
I have a DID and AFAM sprockets to install. I was only to fit it in the winter but, since it maybe be causing trouble, I will change them ASAP.

[Hooli]

The clutch switch isn't on that link, it's fitted under the lever pivot.

The vacuum pipes are the thin ones off the top of the throttle bodies. 3.8mm from memory.
There are five of them, four join together & go to the MAP sensor in the top frame rail & one goes to the PAIRs valve.

[BJ]

 

[Eric GSX1400K3]

I don't actually know what Vacuum lines are for now. But would they be here?
https://www.moto-pecas-suz.com/suzuki-motociclos/1400-MOTO/GSX/2002/GSX1400K2-E2-/MOTOR-TRANSMISSAO/MANGUEIRA--JUNTA-DO-CORPO-DO-ACELERADOR-MODELE-K2-/7/3099282/M/1355

Yes, item 10-15in the diagram  are the  vacuum lines.  Buy a roll of engine vac hose and a box of fittings off ebay, should cost about AUD40. Can get cheaper but you want quality hose that doesnt dissolve at the first hint of fuel.

I assume you  have checked plugs and leads too?

New plugs were fitted. How does one checks the leads? visual inspection? look for cracks?

Yes, check the lines for cracks and that the ends are correctly inserted into the plug caps.

Guys this all makes sence, since we are talking about an 18 year old bike. which has everything still stock by the looks of it, hoses and lines.
One thing I am really happy with is the fact that not a single drop of oil comes out the block, engine is immaculate. Only oil I can find has come from chain. Most people just add oil to the chain. Years of this conduct will accumulate oil on front sprocket cover.
I have a DID and AFAM sprockets to install. I was only to fit it in the winter but, since it maybe be causing trouble, I will change them ASAP.


[/quote]

[steve porter]

haven`t done this myself, but i like the concept
https://www.youtube.com/watch?v=8k1B_lTr-pA

[BJ]

So, after a suggestion on this forum to run my bike with the standard exhaust I got on Facebook "Australia GSX1400" yesterday requesting a left side "Bazooka".
A very kind member gave me his for free so I donated a carton of beer.
I put the pipe on this afternoon and did about 10 kms with the main aim to see how it reacted going on and off the throttle.
I ran the bike down to idle speed, 1100, several times and powered off again with NO jerky what so ever.
A HUGE improvement over the Yoshimura slip on.
The BIG OEM Bazooka is a LOT to love but if it solves my throttle issues I can live with it.
Besides of late I have put OEM exhausts back on my 01 speed triple and my MT01 and maybe now my 14.
I'm just getting too old for loud.
I'll report back after a week of so. Haven't hit the roundabouts yet so that should b a good indicator.

[grog]

BJ, if back pressure works, BPE in Bris can make you up any can you want. I mean a better looker with back pressure. they seem to aim to please. I spoke to them about different for mine. would like something similar to MT09, small and tucked in. Reckons he can do. Just a thought.

[Irish in Oz]

@KiwiCol
Well done mate, the big Bazooka, not a bit of wonder I have never had any issues with my bike. Its standard only changed oil and filters and it goes as fast or faster than the one's with mod's on them