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BuckeyeChuck

WaveRunner bogging under load without choke

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2002 Yamaha GP1200R. Sat for years in a workshop (oil line had popped off or so Iím told). I bought it for $700 on trailer and installed new SBT top end Rebuilt and cleaned all 3 carbs. New Mikuni BN44 1.2 needles and seats. Gold 115g spring. Arms are level with carb body. Pop-off pressure is 75psi on all 3 (with everything being stock). I did a Cat delete with D plate and chip installed. Cleaned power valves and installed wave eater clips. New NGK BR8ES-11 plugs. Runs great on trailer and on hose but once I get in the water under a load and hit 3k rpm it bogs. 3/4 to full choke and it picks up and runs to about 45mph but thatís it. Also getting a bit of fuel back into the hull from airbox. Iíve heard of doubling up on the clear film flap in regulator body to aid in eliminating the fuel dribbles but havenít gone there just yet.

Would running a lower pop-off pressure (say 55-60) aid in these issues (bogging and leaking) or will that just lead to more leaking since allowing easier flow?

I havent pulled the anti-tampering caps from the high and low adjustment screws and am wondering exactly why this is necessary to adjust. If these are intact that means no one has tampered or changed the settings so why would there be a fuel/air ratio problem if Iím running stock settings?

Any other possibilities before ripping this thing down again?
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