jetting gs750esd '83

[Guest]

I have a suspicion I have too large jets. Can someone tell me what would be optimal for my bike? Currently the Main jet in 130 and the Pilot jet is 40.

Symptoms:

• Poor gas milage
• Mid range running poor. stumbles, hesitates.
• Low range and top range it pulls hard and evenly.

The plugs looks ok to me. I have not experimented with plug chops yet, but I want to when I know the jets are the somewhat the right ones.

gsx750esd '83

• stock airbox
• 4-1 exhaust (laser duo tech with no db killer)
• carbs are cleaned, new o-rings, balanced
• air filter new
• plugs new
• fuel cock new
• valves are not checked yet

[hjfisk]

Jetting sounds a little on the large side if I recall correctly. I believe I have 122.5.'s in mine same basic set up but different pipe. I have stock air box, with K&N filter though.

[SVSooke]

Stock is 117.5 and I have a set of 120 mains in my 85 750EF.I have a Supertrapp4>1 and stock airbox.Found BassCliffs carb spec list http://members.dslextreme.com/users/...at_height.html and if you don't have it here's the manual http://www.mtsac.edu/~cliff/storage/...anual_1983.pdf .

[Walle]

Bare in mind I have never worked with jetting ever when I ask this.
To improve the mid range I should shim the needle to a leaner/richer condition, according to what color the plugs are?
Do the main jet and pilot jet influence the mid range at all?
Any thoughts on the fuel mileage (19-21 mpg)?