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Stock Jet size for a 80 GS1000G

salty_monk

salty_monk

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Past Site Supporter
TGSR Superstar
Also why would someone "drill the slide" on carbs for a faster return?

I'm not having any issues just going through some paperwork & reading some notes. As it's all stock (airbox & filter etc) I'm just wondering if TPO was ripped off or if there was some legitimate reason for this work.....

Can't remember what size they supposedly changed the jets for (121 springs to mind but is very probably wrong....(

Dan :)
 
The jet size should be listed on the microfiche -- check a site that actually lists part numbers, like http://flatoutmotorcycles.com

If memory serves, the GS850G, 1000G, and 1100G all used the same 115 main jets. I remember looking this up once, and thinking that it didn't make sense. YMMV.
 
Thanks, 115 mains. It has bigger jets than stock in it then, I looked it up & they are supposed to be 122.5 in there now & the needles were moved up two positions... it must have been running super lean before that if so. Weird!!

Runs really good now, maybe it has a KN filter or something in it... exhaust is defo stock.

Dan :)
 
drilling the slide

drilling the slide

on the bottom of the slide there is a small hole that allows the low air pressure in the venturi to equalize with the air in the area above the slide.
If all movement in the carb is due to pressure differences, and the venturis job is to lower the air pressure going through it. That allows atmospheric pressure to push the fuel through the jets. It also pushes up on the bottom of the slide diaphram as the pressure above it is reduced by equalizeing with the venturi. so yes by altering the size of the hole in the slide you could potentialy get the two chambers to equalize faster. Just remember it was designed by engineers and you will need a systematic approach with good drill stock and several sets of slides to experiment on. It can be done It cant be halfassed. If you do go through with it keep us posted with the results. I for one would like to know what you find.
cheers
 
SOME of the jet kits used to call for drilling the slide hole larger
 
It's already been done (before I bought it). Apparently TPO had an operation & it sat for a while so he paid a guy to go through the carbs, change the jets & set them up.

I was just reading the receipt & wondering what it meant.

It rides great as far as I can tell but I've never ridden another (GS1000) in order to compare.... Maybe Reno Bruce or someone will comment on it up in Yosemite. :)
 
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