Stumped...

A few days ago my motor started to run like pure dog crap out of nowhere. It is a 135 Optimax 2stroke In idle it fluctuates nearly 100rpm and when i increase the speed it still does the same thing. My first thought was an air issue, but I can't find anything wrong with the intake or any disconnected air lines. Also thought fuel, but a different motor runs fine on the same tank. Then I pulled and replaced the plugs, but still the same thing. Then I thought maybe I lost a cylinder. So I pulled the wire off of plug number six so it wouldnt fire and the motor sounds like it is running normally. Checked the plug on the other end and it was clean. Plugged it all back in and it is back to running like poo. What in the world would make a motor run better on 5 plugs than 6, especially since they are all brand new plugs. My guess now is a grounding issue somewhere but i cant find any missing grounds

Is it possible you have a plug wire on the wrong cylinder? Well, I suppose it would have to be two!

haha not vry likely. i think they are too short to reach a wrong plug. That part of the motor is pretty Marine/dummy proof

Check for spark. You may have lost a power pack.

[url=https://forum.tinboats.net/viewtopic.php?p=366912#p366912 said:

takern » 23 Sep 2014, 22:42[/url]"]haha not vry likely. i think they are too short to reach a wrong plug. That part of the motor is pretty Marine/dummy proof

Click to expand...

I didn't mean to sound insulting. It was just something that would easily happen to me.

mine started doing that too! problem #1 was float valve sticking. solved that it got better then seemed to have a magical miss almost like the rev limiter. nothing seemed out of place when I pulled the hatch off. I figured a plug was going bad. problem #2 discovered when getting ready to change plugs out, one plug wire was not seated all the way on the plug. pushed it on, it clicked and been fine since.

[url=https://forum.tinboats.net/viewtopic.php?p=366924#p366924 said:

ggoldy » 24 Sep 2014, 08:28[/url]"]

[url=https://forum.tinboats.net/viewtopic.php?p=366912#p366912 said:

takern » 23 Sep 2014, 22:42[/url]"]haha not vry likely. i think they are too short to reach a wrong plug. That part of the motor is pretty Marine/dummy proof

Click to expand...

I didn't mean to sound insulting. It was just something that would easily happen to me.

Click to expand...

not insulted. no worries. sometimes it is something obvious like that that is just looked over.

[url=https://forum.tinboats.net/viewtopic.php?p=366918#p366918 said:

huntinfool » 24 Sep 2014, 06:08[/url]"]Check for spark. You may have lost a power pack.

Click to expand...

The new plug is sparking. I can see a mark on it. Thanks for the thought though.

[url=https://forum.tinboats.net/viewtopic.php?p=366934#p366934 said:

lovedr79 » 24 Sep 2014, 09:48[/url]"]mine started doing that too! problem #1 was float valve sticking. solved that it got better then seemed to have a magical miss almost like the rev limiter. nothing seemed out of place when I pulled the hatch off. I figured a plug was going bad. problem #2 discovered when getting ready to change plugs out, one plug wire was not seated all the way on the plug. pushed it on, it clicked and been fine since.

Click to expand...

If it was the float valve wouldnt it still fluctuate with one plug disconnected? Its also EFI instead of carb