Purchased in May of this year a NEW 25Hp EL Merc from a local Bass Pro Shops outlet. Love the motor but has developed a problem. Broke in the engine as recommended in the book and by dealer (same procedure). Now, after initial start-up and warm-up, I'll engage tiller to fwd, troll down the channel then slowly accellerate. When I do, the engine sputters for approx 10 to 15 seconds then smooths out. After, it then runs perfectly fine across all speed ranges. However, If I back the throttle down and move at just above idle speeds for approx 2- 5 minuites or longer, then accellerate, the engine will sputter again and smoth out once more.
Worse yet, if I hammer ther throttle after this brief idle (troll) period, it hesitates, stumbles, then accelerates to top speed. Please note that if I vary the trottle and avoid the constant slower speeds, the motor performs fine. It will ide and/or stay at high speeds without a problem whatsoever. Its the slower speeds at zero to 1/4 throttle where this problem occurrs (and hence the following acceleration).
Finally, one last symptom... If at top speed I then cut the throttle back to zero.. quickly..the engine will "Spit" once or twice before settling down to an idle (troll).
Previously had a 15hp Johnson on same boat for years (14' Smoker Craft) and was a beautiful running motor. Had one same problem in that after start up it did sputter on accelleration but once warm, it was FLAWLESS! - I miss that motor!
This is a regrettable problem as I was consiering a Yamaha - as per everyones recommendation - but wanted to buy American. Suggestions? I am very mechanically inclined but due to the age of the motor, I wanted to ask first. Note also I always have fresh fuel. Problem is same with low or high octane fuel as well.
My Guess?:
1.) Fouled Plugs
2.) Carb Setting
3.) Defective Motor!
Signed,
Angry and Frustrated!!
:|
Worse yet, if I hammer ther throttle after this brief idle (troll) period, it hesitates, stumbles, then accelerates to top speed. Please note that if I vary the trottle and avoid the constant slower speeds, the motor performs fine. It will ide and/or stay at high speeds without a problem whatsoever. Its the slower speeds at zero to 1/4 throttle where this problem occurrs (and hence the following acceleration).
Finally, one last symptom... If at top speed I then cut the throttle back to zero.. quickly..the engine will "Spit" once or twice before settling down to an idle (troll).
Previously had a 15hp Johnson on same boat for years (14' Smoker Craft) and was a beautiful running motor. Had one same problem in that after start up it did sputter on accelleration but once warm, it was FLAWLESS! - I miss that motor!
This is a regrettable problem as I was consiering a Yamaha - as per everyones recommendation - but wanted to buy American. Suggestions? I am very mechanically inclined but due to the age of the motor, I wanted to ask first. Note also I always have fresh fuel. Problem is same with low or high octane fuel as well.
My Guess?:
1.) Fouled Plugs
2.) Carb Setting
3.) Defective Motor!
Signed,
Angry and Frustrated!!
:|
