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Carb ID 1978 GS1000

  • Thread starter Thread starter ljjeeper
  • Start date Start date
IMG_6848.jpg


IMG_3488.jpg


Whats the difference between the vm29 and vm26?
 
Those are 26s and you dont have 29s..thats the difference as I see it. Stock carbs for that bike. And dont leave that petcock on prime for any more time than it takes to prime the carbs. Notorious for leaky petcocks filling the crankcase with gas and the unsuspecting ( or uninformed ) owner fires it up and spins the crank due to water thin oil...or one of the cylinders is full of gas and as you crank it it hydrolocks and bends a rod. I would take a piece of hose and put it on the petcock in the on position. Stick the end of the hose in a clear soda bottle and let it sit overnight. In the AM see if theres any gas in the bottle. If none then the petcock is shutting off properly..if there is, then you have a leaky petcock. If you have even a .001% doubt about the petcock and it has been sitting like that on prime, I would waste the 4 quarts of oil in the engine and drain it, then perform the leakdown test as I described earlier.
 
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ljjeeper said:
IMG_6848.jpg


IMG_3488.jpg


Whats the difference between the vm29 and vm26?
Click to expand...

That petcock does appear to be in "Prime" position and it also appears to be the newer '82/'83 GS1100E type instead of the older one. I think the hole spacing might be different between the two.
 
ljjeeper said:
That looks exacly like them. Those are the vm29's?

What would be a good starting point on tuning for the 4-1 exhaust and the pods? Or is there something else that would cause it to run rich?
Click to expand...

Okay, you have the stock carbs. I'm guessing they're running rich because you have the "choke" partially on

You need to give them complete tear down and cleaning with new O rings per the VM tutorial

Then you can verify what jets you have in there and whether it has a Dynojet Stage 3 kit (which is not a requirement for tuning)

Oh, and you need to do the other 9 things from the "Top Ten Common Issues" list. Download a service manual from BassCliff and read through the other links on his page

Then report back
 
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Or the fuel level is to high, the Bozo (PO) had raised the needles too high when rejetting, too big of jets were installed and (or) the carbs need a good going through after the supposed cleaning that was done to get it up for sale ;)
 
I'd also remove the in-line fuel filter, some of them actually restrict the flow of fuel. My bike had running problems when I bought it and removing the filter cured it.
 
Big T said:
Okay, you have the stock carbs. I'm guessing they're running rich because you have the "choke" partially on

You need to give them complete tear down and cleaning with new O rings per the VM tutorial

Then you can verify what jets you have in there and whether it has a Dynojet Stage 3 kit (which is not a requirement for tuning)

Oh, and you need to do the other 9 things from the "Top Ten Common Issues" list. Download a service manual from BassCliff and read through the other links on his page

Then report back
Click to expand...


Are these the top ten you are talking about?
 
Thanks everyone. I've been pretty busy between work and school so it might take me a while to take them apart and go through the check list.
 
So i took the carbs apart today and the main jets are 102.5 and the pilet jets are #15. I havent put them back together yet. Im also wondering how to adjust the needles?
 
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