Question about 2009 Suzuki Boulevard S40
I would also like to know the part numbers for main and pilot jets.
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Posted on Jan 02, 2017
You are dealing with Suzuki vacuum carbs, you cannot just replace the air box and re-jet. What you are running into is there is no pressure to raise the diaphragm because there is no restriction to create such vacuum. Either put the stock box back on or go to the biggest main jets you can buy. Sometime even when you get stage 3 jets you still have issues. Vacuum carbs are not made to run with no restrictions.....putting aftermarket exhaust on it will make things much worse.
Posted on Sep 30, 2009
SOURCE: What jet sizes???? GS750.
i put 115 main jets in my 77 ge 750 and it will run but was told to jump up to 140 with pobs and 4into1 pipe (SM6) race pipe at the low side run 130 main and leave the stock pilot in. i rorde mine from NE to SD roude trip about 1300 miles got about 62 MPG with 115 jets jumping up to the 140 will drop the MPG but lets be real im not looking for MPG. hope this will help.
Posted on Nov 18, 2010
Shop manual for GS550 year models 1983-1986 show ---Two mains are #102.5 the other two mains are #95 ---All four pilots are #35
Hope this helps.
Posted on Jul 07, 2011
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