1989 US Marine Force 85 HP

[marlor]

Engine does not want to idle. Have cleaned carbs and adjusted floats 1/32 lower than parallel to carb body. <br />Its runs worse than before. Please help. Thanks, Mark

 

[oldboat1]

Re: 1989 US Marine Force 85 HP

could be an ignition problem, or still some cleaning needed in the jets. You might get some fresh fuel and oil, and take the motor out and run it at speed for a while -- may find that the problem takes care of itself.

 

[marlor]

Re: 1989 US Marine Force 85 HP

NGK plugs, and fresh gas and oil have been done. I would like to know the correct float level the manual says float parallel to carb body, but mechanics say bend down slightly up to an 1/8 inch.

 

[lonewolf5347]

Re: 1989 US Marine Force 85 HP

check spark at cylinders while it idles, and see if you have spark.

 

[Jango]

Re: 1989 US Marine Force 85 HP

If everything else checks out, take a look at"Sony2001" reply on this forum problem:<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=014431 <br /><br />I adjusted the carbs (with muffs)on my 85HP exactly as Sony2001 suggested and it worked great. Much, easier than adjustment covered in manuals, since you don't need to adjust with motor in water while in gear.<br /><br />Good luck

 

[marlor]

Re: 1989 US Marine Force 85 HP

Engine is now running at 4000 rpm adjusting needles out seems to have no effect, can lean though, but cannot get engine to run slow. How does one adjust timing on this engine, and what is the correct setting? I am over my head, and need a starting point.<br />The fuel is 50 to 1 and fresh, the carbs are clean with new gaskets, floats are 1/32 of an inch down, with new sparkplugs and good blue/white spark.<br />Am in process of checking the reeds.<br /><br />Thanks Mark

 

[marlor]

Re: 1989 US Marine Force 85 HP

My mistake on throttle linkage had two bottom carbs partly open. Still would ;ike to know timing.

 

[Jango]

Re: 1989 US Marine Force 85 HP

My 85 Force also would not Idle.Cause was found to be Low Speed Air Mixture. Carburator adjustments as well as Ignition Timing are covered in above post. Both Clymer manual and Sony2001 indicates 32 BTC.<br /><br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=014431 <br /><br />Good Luck

 

[Jango]

Re: 1989 US Marine Force 85 HP

Forgot to mention - Adjusting the Screws "All the way out" is the exact opposite of what you should be doing. Read the prior posts

 

[marlor]

Re: 1989 US Marine Force 85 HP

Thanks to all for your help, good improvements on engine. Any suggestions on repair manuals am looking at mainly Clymer's on this site? I do not know how to set the timing that and I need more general information.<br /> <br />Mark