Main & Pilot Jet Size Help

[Norseman]

Okay - so I'm tearing down my carbs again for a complete cleaning...again. This goes back to my performance and gas mileage issue (25 miles per gallon), and just checked my main and pilot jet sizes:

Main = 110, Pilot = 2.5

I looked everywhere in my Clymer manual, and as far as I can tell, jet sizes are not specified. Does anyone know what sizes are stock? The bike is completely stock (for now:-D). Bike is the 1981 GS650GL and Carbs are Mikuni BS32SS. Appreciate any assistance...

 

[Steve]

I just looked in the first thread on this forum which lists most, if not all, of the carb specs.

Post #13 shows this:

Hello folks!

I took this from my SUZUKI GS 650 G SERVICE MANUAL
I hope this could help....


GS 650 GZ/GLZ (82)

idle r/min 1100-+/-100r/min
carb mik bs32ss (4 seprate carbs)
id no 34300
bore size 32 (1.26)
float height 22.4.+/-1.0 (0.88 +/-0.04)
fuel level 5.0+/-0.5 (0.20 +/-0.04)
main jet #110
main air jet 2.0
jet needle 5C45
needle jet Y-7
pilot jet #42.5
throttle valve #135
by pass 0.8, 0.7, 0.8
pilot outlet 0.7
valve seat 2.0
starter jet #45
pilot screw pre-set (1.5 turns back (mixture screw))
pilot air jet #160
throttle cable play 0.5-1.0 (0.02-0.04)
choke cable play 0.5-1.0 (0.02-0.04)

GS 650 GD (83)

idle r/min 1100-+/-100r/min
carb mik bs32ss (4 seprate carbs)
id no 34300
bore size 32 (1.26)
float height 22.4.+/-1.0 (0.88 +/-0.04)
fuel level 5.0+/-0.5 (0.20 +/-0.04)
main jet #110
main air jet 2.0
jet needle 5C45
needle jet Y-7
pilot jet #42.5
throttle valve #135
by pass 0.8, 0.7, 0.8
pilot outlet 0.7
valve seat 2.0
starter jet #45
pilot screw pre-set (1.5 turns back (mixture screw))
pilot air jet #160
throttle cable play 0.5-1.0 (0.02-0.04)
choke cable play 0.5-1.0 (0.02-0.04)


GS 650 GLD (83)

idle r/min 1100-+/-100r/min
carb mik bs32ss (4 seprate carbs)
id no 34390
bore size 32 (1.26)
float height 22.4.+/-1.0 (0.88 +/-0.04)
fuel level 5.0+/-0.5 (0.20 +/-0.04)
main jet #107.5
main air jet 1.2
jet needle 5D59-3rd
needle jet X-2
pilot jet #47.5
throttle valve #135
by pass 0.8, 0.8, 0.8
pilot outlet 1.0
valve seat 2.0
starter jet #32.5
pilot screw pre-set (2.5 turns back (mixture screw))
pilot air jet #160
throttle cable play 0.5-1.0 (0.02-0.04)
choke cable play 0.5-1.0 (0.02-0.04)


GS 650 MD (KATANA)(83)

idle r/min 1100-+/-100r/min
carb mik bs32ss (4 seprate carbs)
id no 34390
bore size 32 (1.26)
float height 22.4.+/-1.0 (0.88 +/-0.04)
fuel level 5.0+/-0.5 (0.20 +/-0.04)
main jet #110
main air jet 2.0
jet needle 5C45
needle jet Y-7
pilot jet #92.5
throttle valve #135
by pass 0.8, 0.7, 0.8
pilot outlet 0.7
valve seat 2.0
starter jet #45
pilot screw pre-set (1.5 turns back (mixture screw))
pilot air jet #160
throttle cable play 0.5-1.0 (0.02-0.04)
choke cable play 0.5-1.0 (0.02-0.04)

 

[Norseman]

Thanks, Steve. Go figure - we must have been typing at the same time (there's 9 minutes between postings). I had my post open for awhile when checking sizes.

Anyway, looks like I have the correct sizes, so there goes the quick-fix. The pilot jets look very new, but my main jets do not look very good inside. Maybe another deep-cleaning in Berryman's will correct the problem...

 

[Steve]

How long did you dip the first time? I have found better results when dipping basically for 24 hours.

I will split the rack of carbs and strip the first one down to get it into the dip. The next night, I will take it out, rinse it off, then use the carb spray and compressed air on it. When that is done, I will dip the second carb, which I have already stripped down, and continue at this one-a-day pace until they are all done. Cleans the carbs very thoroughly, have not had any carbs get discolored yet.

.

 

[Norseman]

Berryman's Dip

Berryman's Dip

Last time I deep-cleaned, I only dipped each carb/comonents for 25 minutes each. While they may have appeared clean, there are obviously passages and areas not visible, so I guess visual doesn't really mean the carbs are actually clean.

I will do it again, and this time follow your process. Thanks for the response and help, Steve.