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No more fettling!
After my last post, I changed the pilots to 42 and put the bike back on the dyno. The surprise result was almost AN EXTRA 4 HP!! How did I get this, just from changing the pilots you cry? I`ll tell you at the bottom. The bike runs perfectly from one end of the scale to the other. The constant popping on closed throttle has almost disappeared, thanks to the larger pilots. Here`s the setup.
Model: 2004 Thunderbird (standard)
Carbs: Keihin
Airbox: K&N in stock airbox with no holes and secondary airbox with a few extra holes.
Exhaust: TORS
Ignitor: Stock, 8,700 redline IIRC
Main Jets: 98 (standard)
Needle: Thruxton
Pilot Jets: 42
Air/Idle Screws: left and right carbs 2.1 turns, centre carb 2.2 turns. (the middle cylinder runs hotter)
the dyno results were
71.9 rwhp
52 nm torque
Where did that extra HP and torque come from? I bought the bike with 42,000 kms on it and it was still running the original chain, which hadn`t been well looked after. Purely coincidentally, I had fitted a new chain before the next dyno run. Who`d have thought!!!!
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"Thats Numberwhang!"
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