Join Date: Jan 2015
Location: A stone's throw from Luckenbach, TX
Year/Make/Model: 1996 Kawasaki Vulcan 800 Classic
Help tuning carb:Grampsize
Grampsized per Wolf’s instructions. 170 main, 52 pilot, OEM needle, 1 1/2 turns out, K&N hi-flow. Cobra tapered exhaust w/welded in baffles.
Runs great until I cruise steady at say 55 mph, or 65 mph, then it starts stuttering. I pull choke out and it doesn’t sputter anymore indicating to me it needs more fuel. Lower speeds seem OK while accelerating. High speeds 80-90 mph, OK. Just that midrange speed while cruising steady. Tried blocking some of the air filter, no change. Even put in stock air filter, no change. Turned fuel mixture screw out in 1/2 turn increments and tested each. No change. Farther out, worse it gets.
Because it was mid-speeds acting up, I thought I’d shim the needle (stock) w/two brass #4 washers (very thin). No change in midrange speeds, but runs worse in the other speeds. However, I didn’t change the pilot jet to match raising of the needle, or should I have? Also, with the washers in, I screwed the fuel mixture screw all the way in while idling and bike never stuttered. So was thinking I should maybe change the pilot to next size smaller. I don’t know.
I put it back to square one now as if I just Grampsized. Ideas anyone? Not ready to give up. NOTE: Bike ran perfect before, I just wanted to try the Grampsize system. I did notice more power, and a cooler running bike (installed a temp gauge). Just that pesky stuttering/sputtering has me stumped Thanks for any help!
1996 Vulcan 800, Blue/Green
JUST SOLD: 2016 Indian Scout, Black
SOLD LAST YEAR: 2006 Triumph Rocket III, Black
SOLD LAST YEAR: 1967 Honda 305 Dream, Black
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