Track Day Winner
Join Date: Mar 2016
Location: Kingsville, on
Motorcycle: 86 Yamaha Venture, 84 Suzuki GS1150EF x 2, 93 GSXR 750
93 750 carbs
Bst38ss mikhuni's, any idea's why I would all of a sudden have fuel coming out the small main air jet on the filter side of the carb? It's only happening on #3. I've rechecked the diaphram and o-ring under the top, they both look seated properly.
120's in 1&4
122.5's in 2&3
14.7 (ish) floats
.5 pilot jets
Pilot screw out 2 to 2.5 turns.
Balanced the carbs this afternoon.
Falls flat on it's face at just a bit of throttle, clears up a bit if i back off, farts and kicks till it gets past 7 or 8k then runs like hell. Carbon fouls the plugs, but still pops on decell.
I had 112's and 115's, with the pods and header/pipe it was too lean. I knew it would be, but I installed new carb kits, including the needles and tubes, all the jets and wanted to start from square 1.
Went up to 116's and it was still too lean.
I've read where some are running 132's, 140's, how? I put anything bigger than 125's in it will hardly run.
I had previously driled out a small set of jets to what should be 120's, and it still fouls the plugs after a 10 or 15 minute ride, pops on decel, no power, and falls on its face.
Valves are all in spec, did a leakdown test-no problems there, compression is down a bit, but all 4 cyl's are within 5lbs.
I've been trying to follow the instructions as per the factory pro guidlines, but have been unsuccessfull so far. I just saw the gas coming from the main air jet this afternoon, and i know this is probably the problem, but I can't find the cause and what to do to repair it.
I just do what the voices tell me.
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