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Fuel system queries

  • Thread starter Thread starter Devon bloke
  • Start date Start date
D

Devon bloke

Guest
Hi guys, just bought a GS1000S and have a few early questions


Its in great shape but quite a few jobs. First questions-

1. Trying to get it to run right and when I had the tank off I noticed there is an inlet or outlet tube coming off the tank gauge unit. What's this for and should it be connected to anything?

2. looking at the top of the carbs, I noticed three of the carbs have what looks to be vacuum take offs. One is connected to the diaphragm for the fuel tap but the others are open. Should the others be hooked up somewhere or are they spares or something?

3. It does tick over but the clutch quite noisy unless I pull in the lever a bit. Is this a worn basket or is it an easy fix?


These are just a few ive noticed so far but there will be plenty more :D

Thanks in advance, Steve
 
1. That's a safety hose in case the fuel sender gasket springs a leak. They don't leak normally but there should be a long hose that heads off down to the back of the engine so that any leaked fuel dribbles on to the Tarmac instead of your engine.

2. Those spare nipples are carb vents - keeps air pressure the same inside as out. They should have a hose attached on each side that then dangles loosely over the shoulders of the airbox.

3. They all do that..... Well, not all of them. The common causes are worn springs or a loose main nut. A good carb balance can quieten things down sometimes.
 
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hampshirehog said:
1. That's a safety hose in case the fuel sender gasket springs a leak. They don't leak normally but there should be a long hose that heads off down to the back of the engine so that any leaked fuel dribbles on to the Tarmac instead of your engine.

2. Those spare nipples are carb vents - keeps air pressure the same inside as out. They should have a hose attached on each side that then dangles loosely over the shoulders of the airbox.

3. They all do that..... Well, not all of them. The common causes are worn springs or a loose main nut. A good carb balance can quieten things down sometimes.
Click to expand...

Brilliant thanks Hampshire hog your my new best friend :D
 
Get a clutch cover gasket and check that hub nut pronto before yopu do a lot of engine running. then proceed with the normal maintenace blitz and carb syching etc etc.
 
chuck hahn said:
Get a clutch cover gasket and check that hub nut pronto before yopu do a lot of engine running. then proceed with the normal maintenace blitz and carb syching etc etc.
Click to expand...

Hub nut? do you mean check the clutch and basket isn't gonna let loose?
 
Devon bloke said:
Hub nut? do you mean check the clutch and basket isn't gonna let loose?
Click to expand...

The clutch hub nut coming loose is very common

Pull the clutch cover and strip the clutch down to it's hub and check the nut. Also check the backing plate and backing springs while you're in there
 
Ok thanks guys. I haven't been out on it yet. The guy I bought it off has only just everything back together and he said he has done about 30 on it to MOT etc. I want to check over the bike properly before it goes out the road. I just want to make sure I can get it to run well first. Waiting for my carb balancer to turn up so I can balance the carbs properly. Still not sure about the balancing yet, still researching. I seem to have brass adjustment screws when others seem to have steel screws? Ill have more questions shortly :D Oh and the clutch nut will be the next job after carb syncing :)
 
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Devon bloke said:
Still not sure about the balancing yet, still researching. I seem to have brass adjustment screws when others seem to have steel screws?
Click to expand...
Make sure you are looking at the right screws.

The balance adjusters are the three screws between the carbs.

In all the bikes that I have worked on over the years, they have ALL been steel.

.
 
Steve said:
Make sure you are looking at the right screws.

The balance adjusters are the three screws between the carbs.

In all the bikes that I have worked on over the years, they have ALL been steel.

.
Click to expand...

From my limited experience I guessed these are mixture screws but prob way off lol. I'm still looking at my carbs ill try and put pics up in case someone can draw an arrow on to point me in the right direction :D
 
He's on about CV carbs. You have 4 adjusters (one for each carb). Take the csrb tops off and you'll see them.
 
hampshirehog said:
He's on about CV carbs. You have 4 adjusters (one for each carb). Take the csrb tops off and you'll see them.
Click to expand...


Oh right so all screws that I need are inside the covers so all I need to do is remove the covers to be able to adjust the carbs using vacuum gauges? :)
 
Devon bloke said:
Oh right so all screws that I need are inside the covers so all I need to do is remove the covers to be able to adjust the carbs using vacuum gauges? :)
Click to expand...

Well, you'll need a skinny wrench and a screwdriver

Or, the Motion Pro carb tool

But, yeah, remove the caps and the adjusters are right there
 
Cheers mate, looked again at the diagrams and I see now the adjustment is internal. Just expected the adjusters to be on the outside of the linkage
 
Devon bloke said:
Cheers mate, looked again at the diagrams and I see now the adjustment is internal. Just expected the adjusters to be on the outside of the linkage
Click to expand...
They ARE on the outside of the carbs. Please look at this picture before dismantling anything. :-\\\

adjustmentscrews.jpg


.
 
Steve said:
They ARE on the outside of the carbs. Please look at this picture before dismantling anything. :-\\\

adjustmentscrews.jpg


.
Click to expand...


Arent those CV carbs with the adjusters on the outside? Mine are:confused: SV28ss? with the rectangular tops. Ive seen now that the adjusters are inside these caps?
 
Devon bloke said:
Arent those CV carbs with the adjusters on the outside? Mine are:confused: SV28ss? with the rectangular tops. Ive seen now that the adjusters are inside these caps?
Click to expand...

Correct. You have Mikuni VM28SS carbs. You'll also hear them called manual or slide carbs or just VMs.

Steve's photo is of Mikuni BS carbs aka CVs. They're quite different.
 
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