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Pilot Fuel Screw horror on GS1000 79 model

  • Thread starter Thread starter NitroGS
  • Start date Start date
N

NitroGS

Guest
Hi Guys,

Recently I took off my bank of carbs for a good overhaul. To my horror I found that 2 of the 4 pilot fuel screws had sheared in the seats. I managed to remove one of the tips but the other is impossible to move, I have tried all sorts. To this end I have had to purchase another secondhand bank of carbs at a large expense. I am now afraid of trying to seat the pilot fuel screws without shearing the tips so I can thoroughly clean the carbs. Does anybody have any tips for sucessfully seating these screws please prior to removal.
 
Just take the screws out, don't bother trying to seat them. Counting turns is only useful when your bike is fully stock. Some carb cleaner in the screw heads to loosen up the factory installed paint is recommended as well since it will allow the screw to turn easier.
 
Thank you for the reply, when I reinsert them my friend how will I know how many turns to set them too please
 
NitroGS said:
Thank you for the reply, when I reinsert them my friend how will I know how many turns to set them too please
Click to expand...

Sorry if my first post was not clear.

I broke two pilot fuel screw tips in my 550 carbs while trying to seat the screws in order to count the number of turns they were out. This was during dissasembly when the screws had the paint on them. The screws were hard to turn due to the paint and I could not tell when they were seated - thus I seated two of them too hard. If you just take the screws out and fully remove all the paint and such the screws will turn fairly easily - which makes it relatively easy to tell when they are seated upon reassembly. Just go easy and you shouldn't have any trouble.
 
Last edited:
Nessism

Thank you for your prompt replies as usual, will certainly do as you suggest. Cheers!
 
The Suzuki GS1000 will shortly be fitted with a Vance Hines 4 into 1 and it has velocity stacks. I have fitted the carbs with 120 mains is that a good starting point
 
NitroGS said:
The Suzuki GS1000 will shortly be fitted with a Vance Hines 4 into 1 and it has velocity stacks. I have fitted the carbs with 120 mains is that a good starting point
Click to expand...

Not sure about the main jet size (Keith is the resident expert on these matters). I do know that you will most likely have to do more than just play with the main jets. Raising the needle a notch is generally advisable and maybe even going up one size on the pilot jet. Good luck.
 
Just seat the screws lightly. No damage will result from seating them lightly.
You and I were talking at another thread you made before I left on vacation.
I can help you with the jetting, but I need to know ALL mod's and if you believe the jet needles are stock or part of an aftermarket jet kit. The stock jet needles will have only 5 e-clip grooves. The stock needle do not give good results in many cases, just so you know. I recommend the stage 3 DJ jet kit. The 120 mains you mentioned are way too small.
I also suggest running some K&N ovals instead of the velocity stacks. You need filtration. I don't have much experience with re-jetting velocity stacks but I understand their effect and can factor that into any jetting suggestions. Your typical weather generally results in a richer mixture I'm sure you're aware of. Those two things may cancel each other out. A little extra power will be realized with the stacks at about 7,000 to 8,500 rpm but the loss of filtration makes that a bad deal in my opinion.
 
Just an added question about the weather there...I know it's generally cooler there, which means a leaner mixture (more oxygen in cooler air), but what kind of humidity do you have? High humidity means less oxygen.
I always hear about the UK being foggy, rainy, etc. This would obviously effect jetting suggestions.
 
It's wet there apart from 3 or 4 months a year. When it's hot it's humid, when it got to 100 degrees 4 years ago it felt similar to when I was in Georgia last week!

That's a bit extreme but in general I would say it's similar weather to New York but a bit less cold in winter.

Dan
 
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