25 2 Stroke issue

[Other Line]

I have a 25 2stroke that is giving me issues. Starts fine,idles fine, but seems to bog a little on acceleration, then either runs up to WOT, or seems like it loses a cylinder and won't throttle up.
Never stalls. Dealer went thru Carbs, replaced spark plugs and thermo. Ran great for a few hours now back to this issue. Called dealer, suggested I take a look at the coil. Is that a DIY type of fix? How hard to replace the coil?
Thanks,

 

[DangarStu]

Replacing the coils isn't hard, but don't go throwing parts at a motor that might be working just fine. It is a very expensive experiment. Here is a video I made up on testing the ignition on an outboard: https://youtu.be/MDbvkFM1V_c Only replace the parts you know are bad.

Stuart