Super Jet Cutting out above 3/4 throttle

Rotorhead65

Rotorhead65

Location
Chesterfield, MI
I have a stock 2000 Superjet with a Bpipe mod chamber on it. It ran perfect last weekend and yesterday started acting up. I can rip around no problem but as soon as I go past 3/4 throttle for more that 100 ft it falls right on its face or stalls out. When I falls on its face i can blip the throttle a bit and eventually it will come around. As im blipping the throttle it feels like it wont go above 1/4 throttle. Could it be overheating and limiting my rpms? The only things I changed since last week was a new battery, primer kit, and I replaced the stock pisser with a aftermarket one. I opened up the high speed needle from 1-3/8s to 2 and it didnt change a thing. It was running PERFECT last weekend. Im lost...
 
#ZERO

#ZERO

Beach Bum
Location
Florida - U.S.A.
Check the fuel filter for water or debris inside and check the internal fuel filters inside the carbs. Also check the carbs pop-off pressure and fuel pump diaphragms & check valves are all in good condition. Make sure the fuel tank vent valve direction is correct holding pressure inside the tank. If they're all good you may want to pressure test the engine for air leaks and check the pulse lines & connections.
 
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