hey guys, new to the forum.
Recently picked up a sled with a 440 in it. I think its from a 1977 Nuvik 440 fan cooled. So i can get it to fire a couple times with the primer, but it will not stay running. If i keep doing this and hold the throttle wide open it'll eventually start to run and if i feather it the engine will slowly reach its way to full speed. Then when i slowly bring the throttle down it'll come down to about half throttle than dies. took apart and Cleaned the carb a good 5 times. super clean in there. Ive set the air screw to 1.5 turns out as suggested on the engine plate. no obstruction on the exhaust side. all new fuel lines and new fuel pump which is filling the carb. I have good spark. Cleaned and adjusted the points and popped in new plugs. What do you guys suggest i should be checking?
Also the carb ive got on it is a mikuni (only markings on it is T67)
Thanks in advance for any input. Cheers!
Recently picked up a sled with a 440 in it. I think its from a 1977 Nuvik 440 fan cooled. So i can get it to fire a couple times with the primer, but it will not stay running. If i keep doing this and hold the throttle wide open it'll eventually start to run and if i feather it the engine will slowly reach its way to full speed. Then when i slowly bring the throttle down it'll come down to about half throttle than dies. took apart and Cleaned the carb a good 5 times. super clean in there. Ive set the air screw to 1.5 turns out as suggested on the engine plate. no obstruction on the exhaust side. all new fuel lines and new fuel pump which is filling the carb. I have good spark. Cleaned and adjusted the points and popped in new plugs. What do you guys suggest i should be checking?
Also the carb ive got on it is a mikuni (only markings on it is T67)
Thanks in advance for any input. Cheers!
440 Won't Run Under Half Throttle
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