[Dino_2_5]

First I would like to say that I have read all the engine runaway threads. The differance with mine is, it shuts down with the kill switch. It doesn't stay running like in all the other threads. As soon as I start it, it goes to full RPM and just bounces off the rev limiter(ging, ging, ging, ging). I have performed an engine leak down test and there are no leaks. Compression is good: forward - 155 and aft - 148. The carbs: in the manual has 1 1/4 turns for the high speed screw and 2 1/16 for the low speed, this is what I have set it to for starters. I have a carb rebuild kit on the way. Is there anything else that this could possibly be?:smilie_help:

 

[GCwaverunner]

make sure the plugs are BR8HS and not 7's. They recommend 7's but they're too hot. It will be a carb issue. Take carb apart and clean out. Check the little clear plastic valves are fine too. Also check the idle adjustment is set correctly.

 

[Dino_2_5]

I do have the BR8HS plugs. I received the carb rebuild kit. I will try to get it rebuilt tomorrow night and hopefully see what happens! Crossing fingers...

 

[Dino_2_5]

Well, I rebuilt the carb. The filter was full of crap. That was the only thing that I noticed. All seals/gaskets/diaphrams looked good. Started it and it did not jump to the rev limiter like before. So this should be good news. I need to adjust/fine tune the carb now. Hope all is well...

 

[Dino_2_5]

Went to adjust it today after getting a hose kit for it and now it's back the high revs! I have even closed the low/high speed screws. Still does the same thing. No matter what I set the low/high speed screws to, doesn't make a differance on how it runs. There is no change!

I am lost. NOW WHAT?

 

[Dino_2_5]

Found the problem! The butterfly was open slightly even after adjusting the throttle cable and the idle stop. So as I was pondering to melt the ski down into a bowl, I noticed that the butterfly was slightly open even though the throttle cable was disconnected. I adjust the butterfly on the throttle side for a more sealed appearance. Well, this actually worked. At all levels throughout the throttle range!