92 model johnson fastrike 150

straitstack

Cadet
Joined
Feb 23, 2020
Messages
14
so i have been having a 'miss' at a little over half throttle.. its been to 3 different mechanics and spent $1300 on this thing... in the shop they have put in new power pack. spark plugs. spark plug wires. cleaned and rekitted all 6 carbs. new fuel lines. a fuel water seperator...... problem still there. but i took it out tuesday and was missing really bad then a little more throttle and it just smoothed out but no power... (which told me most likely 2 cyclinders one on each side just quit) ...20mph on a 24ft pontoon.. (ive had it to 27 with a miss) when i got home i pulled all plugs... bottom 2 cylinders fouled .. replaced plugs and took out again yesterday..ran like hell fpr a bit then smoothed out .no power again...got home... bottom 2 fouled again.. can someone give me some insight here im at the end of my rope with this thing and its prolly gonna be something simple... any and all advice appreciated
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Do a cylinder drop test on it to find out which cylinders are acting up and go from there.
 

straitstack

Cadet
Joined
Feb 23, 2020
Messages
14
[No message]
 

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straitstack

Cadet
Joined
Feb 23, 2020
Messages
14
that left to right.. top to bottom cylinder on one side.. the other side look identical top to bottom
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,931
Take the lower coil and swap it with middle one and see if problem follows
 
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