15 Johnson Flat Spot low down

JackHunter

Cadet
Joined
Jun 8, 2011
Messages
20
Hi guys, ive just finished an overhaul on my little boat.

i have a small flat spot / shudder just as its about to get up on the plane, i cant figure out what is doing it.

its 1997 Johnson 15 HP j15REUC

i have changed the plugs, flushed the fuel system fresh fuel and oil
i did fix the smoke problem however :) just need to get this flat spot out.

i feel like it needs a tune but i cant find a manual that covers my exact model, i can find the model before and after and its not the same :(
 
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