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Which are the correct stock jets?

  • Thread starter Thread starter taterntot101
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taterntot101

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1979 GS 550E. According to the carb spec sheet on Basscliffs site, the correct jets should be a 92.5 for the main, and 40 for the pilot. Can anyone verify that this is dead on please? I ordered what I was told were the only jets available from the dealer, they arrived today, and were #80. As far as I can tell from the chart, they were only used on the 550L. Thanks in advance.
 
taterntot101 said:
1979 GS 550E. According to the carb spec sheet on Basscliffs site, the correct jets should be a 92.5 for the main, and 40 for the pilot. Can anyone verify that this is dead on please? I ordered what I was told were the only jets available from the dealer, they arrived today, and were #80. As far as I can tell from the chart, they were only used on the 550L. Thanks in advance.
Click to expand...

HI.My 550 service factory has #80 main jet
Pilot Jet No. 1 #15
Pilot Jet No. 2 #50

Andy
 
The figures you quote for jets are for the CV carbs. Rover has given you the standard sizes for the VM carbs. Your bike should have VMs being a '79 but make sure you know which carbs you are buying for - somebody could have messed with something.
 
I'm good and covfused now. Rover, my bike only has 1 pilot jet that I know of, a #50. I don't know what the #15 would be. Hampshiredog, my bike is a '79, cv carbs wern't introduced in the US until 1980. I don't know why the specsheet on Basscliffs site shows a 92.5 for the US from 1977-1979 on the 550E. Thanks for the replys, it's appriciated!
 
taterntot101 said:
I'm good and covfused now. Rover, my bike only has 1 pilot jet that I know of, a #50. I don't know what the #15 would be. Hampshiredog, my bike is a '79, cv carbs wern't introduced in the US until 1980. I don't know why the specsheet on Basscliffs site shows a 92.5 for the US from 1977-1979 on the 550E. Thanks for the replys, it's appriciated!

Got this from 550 Service Manual(I had a 1977 550)
550001.jpg


550003.jpg
Click to expand...
 
Just looked at a couple of parts fiches and found the best for numbers at Alpha Sports (don't order from them as they are too expensive):

..JET, MAIN 4[COLOR=#00800] C,EC,N,EN; A80 [/COLOR]

JET, PILOT NO.1 4[COLOR=#00800] C,EC,N,EN; A15 [/COLOR]

JET, PILOT NO.2 4[COLOR=#00800] C,EC,N,EN; #50 [/COLOR]





And Basscliff's site shows the numbers you mentioned for the 1980 550ET and 1981 EX not your 79 550EN which uses the same carbs as the 77-79 550L (it shows the correct numbers for you on that line).
 
Last edited:
Thanks, that clears up a lot for me. So the dealer got me the #80 main jets, the bike already had the #50 pilot jets in it. Thankfully I was already aware that at some point the bike had been modified with straight pipes, pods and jets, guess they didn't mess with the pilot jet, though. I'm just trying to get it back to stock. I have to do some reading to figure out what the A15 pilot jet is... Thanks again, this thing will run again one way or another.
 
taterntot101 said:
I have to do some reading to figure out what the A15 pilot jet is... .
Click to expand...

On the 550s there are 2 pilot jets in line. If you unscrew the one you can see there is one 'buried' behind it. If the carbs have been laid up for a while take care not to bugger up the head when undoing. Use a perfectly fitting flathead screwdriver and preferably soak with penetrating oil before attempting to undo it.
 
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