When to change coils on the TR1 engine-210 FSH boat

[JetBoaterSoon2022]

The boat has one engine that is changing rpm’s at about 2500 rpm. At 8000 rpm, the engines run fine. A jetski mechanic thinks it may be the coil on a cylinder fluctuating. Anyone ever had this problem?

 

[FSH 210 Sport]

I have not…I do have one engine that runs rougher at idle than the other since new though.

When was the last time you put a set of plugs in it? That seems to be the cause of several issues ..how many hours do you have on the engines?

 

[lazergeek]

Spark Plugs solved my low RPM's on my Starboard engine with only 50 hours on them. You can always swap coils between engines to troubleshoot.

 

[Ronnie]

Unless they are cheaper for your engines coils are not cheap, mine are over $200 each when they are not on back order. I would only replace them as they fail not as a preventative maintenance measure. Suggest you start by replacing the plugs. If that doesn’t work switch the coils between engines (one at a time) to see if it’s a coil failure and which one.