Let me start by saying that I am a “newbie” to boat ownership and this is my first boat and Evinrude engine, any and all suggestions are greatly appreciated.
Long story short, I purchased a 1990 Pursuit 2350 with a 2004 250 Envinrude DI Ficht Model Number E250FPZSRM EMM Serial Number 5004201. The engine has about 685 hours on it as today, and I have operated the boat/motor for just about 100 hours and still have not found the issue that is creating what feels like miss firing at low RMPs 1700-2700.
The problem that I am having is a significant motor vibration, which I believe is the motor miss firing at RMPs 1700 – 2700. The motor works very well below that RPM range and above that RPM range up to WOT. The engine starts easily and idles fine with the normal response in power from idle up to WOT. When the engine RMPs approach 1700 and the power is still consistent, but the engine starts to vibrate and has a rough run from 1700 RPMs to 2700 The miss firing has been constant since the 1st hour (585) that I used the boat to current hour (685). In order to resolve the miss fire issue at the specific RPM range, I have done the following:
Any suggestions on similar issues and or fault tracing ideas are greatly appreciated.
All the best,