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b85 Johnson 70hp stalls when accelerating

F

fmarando

Contributing Member
Motor starts and idles fine.

Motor starts and idles fine. When I try to accelerate it stalls unless I hit the choke. Then it will take off and run fine. The powerhead is rebuilt. I have rebuilt and cleaned the carbs. Do I need to increase the size of the main jet orifices? If so how much?
 
"I have already taken the carb

"I have already taken the carbs apart, cleaned everything. Soaked and blew out all the passageways. Replaced all gaskets, needle and seat. Removed, and cleaned main jet orifices. I just remember reading somewhere that when you rebuild a powerhead and bore cylinders oversize you may need to increase the main jet size. I can't find the place where I read it. It just doesn't seem to get enough gas to accelerate when I initially put the boat in gear. Hitting the choke squirts enough gas in to get the thing going and then once I'm moving it is no longer starving for gas."
 
"i have rebuilt many engines,u

"i have rebuilt many engines,using original hs jets....however,i have been better educated,over the yrs...i wouuld say,needing lgr jets,is not,ur prob,....may help,but would be masking an air lk,bad reed valve,etc..."
 
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