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Mariner 8hp 2 stroke wont run at full throttle

mister p

New member
My engine has had two new coils and plugs, it runs beautifully up to 60% throttle, anything over that and after 10 or 15 seconds the unit starts spluttering. New tank, fuel line and fuel. Fuel filter is clean and bowl full. She runs up to full throttle in a tank and holds it no problem, but under power after 10 seconds or so she splutters......not dies. When I return to part throttle, she's fine. Any ideas?
 
good point, carb will be off tomorrow and the float will be checked. there are two more coils under the flywheel, what's the chance these are to blame and how are they checked?
 
Definitely not getting enough fuel for WOT operation. Have you tried squeezing the bulb at the same time? If that cured it, then the fuel pump is weak (or has an air leak before it). If you tried that and it made no difference, then your float system is not allowing enough fuel in.

Jeff
 
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