Rude 9.9 idleing

[StarTekh]

hello i have 1985 rude 9.9 .. local omc dealer redid carb with me. was jamm'd up bad with<br />3 year old gas.. no problem we cleaned and installed a omc carb kit.. i re installen the carb <br />and managed to get the motor to start but noted water spraying out of head water cooling <br />block ..no problem i got the gasget 2.50 and head gasget also .. i installed both, removing<br />the thermastat .. it was baddly dammaged and another dealer said .. its np to runn with out it.<br />i fired up motor no problem now i playd with idle adjuster but it seems to either cut the motor<br />off or when open'd , it seems it wont correct much .. gas is 50/1.. suggestions.im also wondering <br />could it be power pack related or a going down coil ..jon

 

[OBJ]

Re: Rude 9.9 idleing

John, put a new t-stat back in. The engine is designed to run at a particular temp. to aid in the combustion of the fuel/oil mix. Your block ain't hot enough to alow a smooth idle.<br /><br />Put in a new t-stat and then get the engine up to temp before making idle adjustment.<br /><br />Keep us posted....Thanks.

 

[StarTekh]

Re: Rude 9.9 idleing

thank you for your input: i can see what your talking about.. with thermastat installed head<br />warms up quicker.... now i playd with better gas and oil.. regular/wallmart oil didt cut it..<br />omc johnson/evenrude oil + i didn 50regular 50 supper..as we have no mide gread here.im going to try a mix of supper and also might try a lead additive...<br /> never quit till u can count the RPM when ideling

 

[Boatist]

Re: Rude 9.9 idleing

John<br />You do not not need anything above 87 octane. If your motor is up to temp should be able to hold finger on top of head for about 4 sec. I would do the decarb thing then change the plugs warm engine up and adjust the idle mixture. When adjusting idle mixture turn the knob a little at a time and give motor some time to react. Plug gap should be .030.<br /><br />If you want to check spark open up one of your old plug to 7/16 of an inch make sure it is grounded move one of your plug wires to it and start motor. Should get a good spark. Shut down motor and do the same to the other plug wire.

 

[michiganmarty]

Re: Rude 9.9 idleing

Boatist,<br /><br />You said to use a 7/16" plug gap to check the spark. Does it matter which of the four versions of ignition systems these motors came with?<br /><br />I have the same problem, "poor idle", but on a 15 hp 'rude. I also suspect the timing/ignition system. I have a post on this forum looking for help as well.

 

[StarTekh]

Re: Rude 9.9 idleing

thanks for all the input. i didnt change the thermastat. and i will have issues with fuel mix <br />as im sure at some point them motor was runn 100/1 and in 1985 there was lead in gaz..<br />the plugs are new .. and im going to mess with fule. but just a bit..i should tell u ..this motor<br />sat at bottom of the lake for 30 days and others recover'd it.. seems they did a fair job..<br />as it runs now rather well. im real close with ideling now .in winter i wana rebuild it . input plz . jon

 

[Boatist]

Re: Rude 9.9 idleing

Marty<br />The reason I said 7/16 if because of some of the systems may be damaged if you just hold the wire out one inch. All the systems should jump a 7/16 gap with out damage when not under compression. Just make sure you have plug grounded. Way I do it is made a plug ground wire with battery charger connector clamp then run other end of wire to a ground with a ground clamp. I have a 1975 15 hp with points. You can check timing with a timing light. The index mark is kinda between the carb and the throttle cam just below flywheel. Both plugs time to the same location. OMC Joe really good on OMC outboards. Also lot of good info on link below. <br /><br /> http://www.pugetsoundanglers.org/Fishing Info/Johnson 9.9_15.htm