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View Full Version : Help: jet setup for 83 gs 450



map450
12-07-2010, 5:45 PM
i know this is a stretch but does anyone know jet sizes to run with pod filters and a decently open exahust. i can weld in baffles if you think it would help.


thanks in advance

cabtherocker
12-07-2010, 6:29 PM
If I remember its a 120 main jet so I would go with a 125 and the high jet is a 130? and I would go with a 135. Also if you just put pods on you don't have to change you idle jet... When you pull off the bottom of your carbs and pull out the jet it will say on it what size it is, just get one or two sizes up.

Hope that helps. Oh yea and don't expect a huge difference the gs-450 dosn't have a lot of hidden horse power, But it dose have 6 gears so put a bigger sproket on the beast!

map450
12-07-2010, 7:06 PM
haha im well aware of the power. its like theres 2 hamsters running on wheels in there. thanks for the help will yank them off and give it a look

erockson
12-07-2010, 9:30 PM
I have an 86 GS450 with pods and open exhaust (no baffles), I went with the stock pilot jet size 37.5, but replaced the stock ones with new replacement ones (you'll notice that the stock ones are solid tubes, while the new replacements will have holes in the emulsion tubes for a cleaner mix). My main is a 135. I have no issues anywhere in the throttle range and the plugs are spot on, of course every bike will be different, but for small stuff you can also drill out the EPA plugs and adjust that mixture (mine are drilled but I didn't need to make any adjustments)

Here's a link if you want to get the jets on the cheap (and see what I'm talking about on the pilot jets):

Main Jets:
http://www.chaparral-racing.com/Product/mikuni-kn100-604-large-round-main-jet/342-1561.aspx

Pilot Jets:
http://www.chaparral-racing.com/Product/mikuni-vm-22210-low-speed-jet/SD-04002.aspx
http://static.chaparral-racing.com/productimages/600/SD-04002.jpg

gk45241
07-20-2012, 2:06 PM
Which jet is the idle jet? want to throw a par of pods on a GS 450 as well. Stock exhaust. 480 foot elevation.

Any ideas, I read I wouldn't have to change my idle jet for pods. which one is the idle jet? the main or the pilot jet? I'm very carb stupid.

Thanks,
Gary

gk45241
07-24-2012, 12:13 PM
Anyone? Anyone? Or is an 83 GS450 not worth my time?

Gary

TrevHead
12-04-2012, 11:11 PM
Pilot jet is the idle jet. Main jet is for 3/4 to full throttle.

TrevHead
12-04-2012, 11:14 PM
Also jetsrus.com sells OEM jets that are half the price.