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gs550 tuning

  • Thread starter Thread starter tc862011
  • Start date Start date
T

tc862011

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my gs550 is running better now, but there is alot of loud snapping when i rev it up and when i am riding it does it and it rides a little rough because of it. i have the original air box and pipes, i am about to spend the money for it to go into the shop. fuel screws are at 1 turn and the air screws are about the same. would like to fix this with out spending money. i sprayed stuff around the head gasket and intake boots and nothing is leaking. so i would love help so i can fix it before it is gone for weeks
 
o and i just thought of something, would not having any rubber hoses on the vent nipples for the carb affect anything.
 
Please provide details on what maintenance you have done to the bike.

Full carb rebuild w/fresh O-rings inside and on the intake boots?

Valve adjustment?

Clean air filter and airbox sealed all around?

Condition of points and condenser?

One thing: the air screws should be open about 1.5 turns and the fuel screws about 7/8ths if the intake and exhaust is stock and properly sealed.
 
Hi,

Many bikes with pod filters do not use hoses on the carb vents. Just make sure they are pointed down.

Now, CLICK HERE, read and learn.

Then CLICK HERE, read and learn. ;)


Thank you for your indulgence,

BassCliff
 
its all been rebuilt the points are a year old, andit has new intake boots and orings, i rebuilt the top end and i believe the air box and pipes are sealed up. how would i test the pipes to see if they are sealed right, i put new exhaust gaskets on when i put the exhaust back on
 
Hi,

What year is your bike? I'm assuming a '78 or '79 since you seem to be describing VM carbs. If so, have you tried setting them according to Mr. Nessim's instructions? Have they been properly cleaned? Has a shop been working on your bike?

Exhaust leaks in the header can sometimes sound like "snapping" or "clicking". Can you tell if any noises are coming from that area? Underneath, where the header joins the mufflers, you almost have to wave a cigarette (or maybe incense) underneath to detect puffs of exhaust leaks. Or perhaps use a spray bottle with water, or atomizer, that puts out a fine mist and look for disturbances.

As for the airbox, have a look at the tutorials on my little website to get an idea of what's involved when ensuring your airbox has no leaks. See Air Intake Repair and Airbox Sealing.


Thank you for your indulgence,

BassCliff
 
i will have to check, but i wouldnt think it would leak with new gaskets in it
 
alot of the time when its making the noise, it kinda looks like its coming out of the carbs
 
Hi,

When was the last time the valves were adjusted? Is the timing set properly?


Thank you for your indulgence,

BassCliff
 
i have the cam timing set as the manual says at 20 roller links. i went by the manual for the points timing and i believe i have that set right, i will be checking valve clearence tomorrow, but the bike ran with the same shims last year and it ran good, so i didnt think anything would of changed with them
 
Reset your pilot screws.

And please post some photos so we can see the condition of your bike.
 
side profile of my gs550
 

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front view of my gs550, with h.i.d headlight
 

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my dedication my younger sister, we took the motorcycle course together a little over a year ago and was learning to ride together, and tragically a couple months after the course she got in a car accident and passed away at 23
 

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Very sad story about your sister. May she rest in peace.

Since your bike is stock that makes your task easier. Did you verify all the jets in the carbs are the exact same number/size as the factory originals? Many times people buy crappy aftermarket carb kits which come with inferior jets which mess up the carbs thereafter.

To recap: set fuel screws at 7/8 turn and air screw at 1.5

Vacuum sync the carbs

Double check your points to make sure they are gaped and timed properly.

Good luck
 
tc862011 said:
these carbs had 90's in them is that the right size
Click to expand...

Dude, please don't make me pull out the manual when you can do it for yourself. Also, at the top of this forum there is a thread with all the OEM carb jetting specs. Please look it up.:cool:
 
I have a haynes manual for my bike and it doesn't tell you where to set the fuel screw
 
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