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2004 Yamaha 90 HP four stroke throttle issue

R

Robin Pawlikowski

New member
I have been working on a 2004 Yamaha 90 HP four stroke. I cleaned the carburators and ran fuel system cleaner through it and it idles great and when you apply full power it runs great but if you slowly apply throttle around the 1500-2200 rpm it will. Choke out and stall. Any ideas I am planning on takin the carburators off again and soaking them over night in hopes I missed something on the last cleaning and replace the fuel lines in the motor as well as the spark plugs.

Thanks for any help
 
Maybe your accelerator pump circuits? Idle mixture screws a little lean? Over propped? Should get near 6000 wide open.
 
Thanks I'll check those things. As far as the rpms it gets to 58-6000 at full throttle its just getting there that's the problem. I you push the throttle fast it wwill hesitate for a second or two and then take off like a jet but if you push it forward slowly it stalls.
 
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