Force 85 hp L Drive fast idle

[krobertson]

Guys,

Doing a bit of work on a Bayliner I picked up. REPLACED - Water pump check, plugs check, fuel filter check, timing check, went through carbs check, compression test check (lowest piston from bottom 129 - highest 141 top), fresh gas and oil check.

When I first got her she ran a bit rough, idled a lot higher and didn't want to pull out of the hole very well, spudded in mid range but top end wasn't bad. Well now I got the motor running like a top!! Starts first piston up, runs great. Took it to the lake ran it for over 1 hour non stop today. Good power and top end but the thing idles at like 10 mph. As you know this makes it hard to put in and out of gear. So how do I sent the idle, by the linkage rod that attaches the throttle tower to the cable? It seems to be pulling all the way back. Could it be that the carbs are not set right on tower sync plate thing? Should I take the set screws lose and make sure the carbs are shut the way it sits on the cable now?

 

[jerryjerry05]

Re: Force 85 hp L Drive fast idle

The connector at the top. DON"T touch. That's to set the timing.
The idle is set at the bottom of the shaft.There should be a screw/nut combo on the bottom.
Turn it out to drop the idle.
Top post is a linc and sinc by FrankA Do this.
Check the comp again. If they aren't all real close. Do a de-carb.
Mercury's Powertune or OMC's product work well. Seafoam doesn't work.

 

[krobertson]

Re: Force 85 hp L Drive fast idle

Ok...found the idle screw it was tucked back in there pretty good. One other question when I went through the 3 carbs, top 2 mixture screws were all the way in, the bottom one was 1/4 out. Someone has been messing with things from wiring to mechanical on this boat. I am pretty sure carb 1 and 2 are not supposed to be all the way in. Most of the motors I have worked on are usually 1.5 out or better. Any advice on a starting point?? Hey it runs well but wondering if it has a bit more pull out of the hole. And it has a small chug off high idle to mid but very very small. I was hoping this was a air/mix thing.

 

[pnwboat]

Re: Force 85 hp L Drive fast idle

As a general guideline, mixture screws should be anywhere from 1 to 1 1/2 turns out from lightly seated.

 

[jerryjerry05]

Re: Force 85 hp L Drive fast idle

The 85 and 125 were set at 1 turn out from the factory.Then most people reset them.The factory suggested that the 1 turn out is the best spot and to leave it there. My motors,twin 88/85's are both set at 1 turn out.