Carb Jetting ~ Suzuki GS500
But first, lets pay some bills:
|STOCK1USA||1989||Stock||Stock||37.5||0||122.5||0||0||from GSTwins Wiki|
|STOCK1||1989||Stock||Stock||40||0||122.5||0||0||from GSTwins Wiki|
|mrhawx95||1998||Stock||Stock||40||0||127.5||2||3||runs far better, little on the rich side idle still not 100%|
|nakedgs||1992||Stock||Lunch||40||0||132.5||2||3||Runs great, probably a tad rich at idle.|
|aero_b||2000||Stock||Lunch||40||0||142||1||2.75||Too rich, but safer than 132.5 (too lean & backfiring). Will go down and re-post settings|
|mrhawx95||1998||Slip||Stock||40||0||127.5||2||3.5||Near perfect, pulls great now and idles good. Using delkevic slipon.|
|ineedanap||1990||Slip||Lunch||40||0||134||0||2.5||DYNOJET KIT. Didn`t drill slides. Needles on 3rd clip from top. Runs great|
|jeremy_nash||1995||Slip||Lunch||40||0||142.5||0||0||jets only, airscrew setting was good, so I didnt mess with it|
|psyber_0ptix||1991||Slip||Lunch||40||0||150||2||3||+79ft elevation.Runs a tad rich, might try taking out a washer and reducing main to 147.5|
|STOCK2||2001||Stock||Stock||17.5||60||127.5||0||0||from GSTwins Wiki|
|STOCK3||2003||Stock||Stock||17.5||60||130||0||0||from GSTwins Wiki|
|DanUK||2004||Stock||Stock||17.5||60||130||2||3||3rd clip position, runs great|
|scooky||2009||Stock||Stock||20||60||132.5||1||3||oring washer Happy hot cold and better low rpm response|
|respite||2007||Stock||Drop||20||60||132.5||2||3||far better than stock.|
|radodrill||2009||Stock||Drop||20||60||142.5||1||2.5||No restrictor on K&N filter|
|sikiriki||2002||Stock||Lunch||22.5||65||142.5||0||3.5||satisfied, on the lean side but ok.|
|mitch||2003||Slip||Lunch||20||60||142.5||2||3||bike may be a bit lean, will rejet to 20/65/145 or 147. Does not run well cold (needs floats done)|
|Unsane||2004||Slip||Lunch||20||65||145||0||3||Bit cranky when cold but much better warmed up - midrange & top end punch improved|
|spray____||2006||Slip||Lunch||20||65||147.5||0||0||close enough for me for now|
|drewbytes||2008||Full||Pods||20||62.5||147.5||0||3||increased idle to approx 1000 cold, 1400-1500 hot|
|Black and silver||2007||Full||Lunch||20||62.5||155||1||3.75||12.5:1 AFR|
|galahs||2005||Full||Lunch||20||65||145||0||0||Jets only rest are stock settings but increased idle spped a touch|
|Punkal||2006||Full||Lunch||22.5||65||147.5||0||3||Bike is rich rejetting to 22.5/62/5/142.5|
Stock = factory exhaust
Slip = slip on exhaust can over stock header pipe.
Full = full headers and pipe performance exhaust system.
Stock: factory air filter and box.
Drop: K&N type air filter replacement slipped into the stock air box.
Pods: K&N type cone air filter pods installed one onto each carb.
Lunch: Large K&N type air filter installed over both carbs.
Pilot: pilot jet size
Mid: mid range jet size (GS500 carb changed from 2 jets to 3 jets in 2001)
Main: main jet size
Washers: small washers installed under main jet needle to raise needle (two washers are roughly equivalent to one clip position on a jet kit replacement needle).
Air Screw: number of turns out from gently seated on the air adjustment screw. "0" turns out in the Air Screw column above means unknown or not modified. If your get to 0 turns you need a smaller main jet.
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Think: Cars are expensive, powerful, and heavy. Before I start work, I face the possibility that I will destroy my vehicle, my own life, and innocent pedestrians' lives. If anyone messes with a 4000 lb machine capable of 100 mph, these are real possibilities. If I get in over my head, I call a professional mechanic. The information on this website is provided only for entertainment purposes, and it is not intended as advice on how to service a vehicle. For all you know I made this up. Don`t believe everything you read on the internet.
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Last modified: 6/6/2015