150 hp johnson gt stalls

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cranfill1

Recruit
Joined
Jul 27, 2005
Messages
2
I have a 1985, 150 hp Johnson gt that bogs down when trying to acclerate from idle in gear. If you hit the choke it takes off fine. It idles fine and runs fine throught out the powerband and starts easily. I had a local marina tell me to adjust the idle up and I did and it ran fine for 3 weeks than I had it out this past week and it started having the same stalling problem. I do not know if makes a difference, but it was 100 degrees out with 94 percent humidity. It has 14.5 by 26 raker prop. I did know if that prop could make it bogg down?
 
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Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: 150 hp johnson gt stalls

Welcome!!<br /><br />Must be a fast boat to be using that big of a prop. All your symptoms point to an issue with the carbs. Lets get those cleaned and new kits installed.<br /><br />Obviously with that big of a prop the motor must be perfect for the holeshot to be acceptable. What kind of boat? jackplate? Top rpm?
 
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cranfill1

Recruit
Joined
Jul 27, 2005
Messages
2
Re: 150 hp johnson gt stalls

It is a 17.6 foot Dyna trak fish in ski with a jack plate. It runs around 65 mph with Rpms at 5000.
 
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red10

Petty Officer 2nd Class
Joined
Dec 11, 2003
Messages
175
Re: 150 hp johnson gt stalls

fisherman, i have the same boat, 1983 dynatrak f/s with a 150 gt, no plate, 24 raker at 55 on gps, i never thought they were that fast, i don't know anybody with that same boat either. there a good solid boat. To what dhadley said, definatetly clean the carbs.
 
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