idle speed..??

[trog100]

i know this dont really belong here but its more likely to be answered here than where it does belong.. sooo<br /><br />bin playing with a little 9.9 chrysler outboard that aint bin run for a while and is of unknown quantity..<br /><br />anyways we have it running on a hosepipe without the bottom half attached.. the idle speed which seems to be fixed and governed by two cutouts in the throttle butterfly is about twice what it should be..<br /><br />there is a mixture screw but no throttle stop adjustment..<br /><br />will the bottom half being attached.. impellor.. gears and battery charging drag assuming it does this slow it all down to something more reasonable..???<br /><br />also what viscosity oil should i bung in it...<br /><br />trog100

 

[WillyBWright]

Re: idle speed..??

Having the gearcase on won't bring the idle down much. Having the complete motor with the gearcase properly in the water with some backpressure for the exhaust will. The ventilated butterflies take the place of the idle speed screw found on just about everything but American outboards. That was to give a more consistent idle speed over the entire line. Makes it awfully hard to dial-in once age and wear set in.<br /><br />It probably doesn't have a battery charging circuit.<br /><br />I assume you're talking gearlube? Marine gearlube would be best, but it's not like that 9.9 is going to shred the gears from the wrong gearlube. Most any gearlube (except for Electric Shift) should work fine. Marine gearlubes have additives that help suspend some water that may leak in rather than settle to the bottom.

 

[trog100]

Re: idle speed..??

Thanks Willy.. i was about to pull the carb off again and solder some plates over the cutouts in the butterfly till someone pointed out it would probably go slower with the bottom end on.. he he<br /><br />as long as it goes into gear okay i dont suppose the idle speed matters that much.. its attached to a twenty foot boat so at idle it aint gonna be going too fast.. he he he<br /><br />it might sound silly to have such a small motor but in england its a common size for canal cruising.. the boat does have a planeing hull and will take up to a 100 hp outboard if we find something bigger cheap enough the little 9.9 can either be a kicker or sold on..<br /><br />a couple of other things that i am wondering about..<br /><br />a solenoid controled electric choke with a little hinged flap.. i assume this is temperature controled and opens up when the engine warms up... but then again.. ???<br /><br />there is also a big-ish push to make switch connected in with the gear/throttle linkage.. does this kill the ignition during gear shifting or do something else.. ???<br /><br />this "marine gearlube".. something i have been wondering for a while.. is it based on straight 30 or 40 engine type oil or the thicker hypoid 70 80 90 type stuff.. with most oils the viscosity gets quoted with "marine gearlube" it never seems to get mentioned.. i would have guessed the thicker stuff but an old BMW in/ob leg i was recently playing with it quoted straight 30 grade engine oil on its plate.. all the googling i have done just produces "marine gearlube" which of course still leaves me wondering just what the stuff is.. he he <br /><br />thanks for any help..<br /><br />trog100

 

[WillyBWright]

Re: idle speed..??

Marine gearlube is a hypoid. Somewhere around SAE 90. Some older Volvo Penta drives use 10W40 motor oil. . But you should use the heavy stuff.<br /><br />One place I worked at had a 20' jon boat with an 8' beam for delivering piers and lifts. An old Sea King 9Hp (actually a Chrysler) planed it with no load and 2 men. <br /><br />I haven't seen an electric choke on one.<br /><br />The neutral safety switch for electric start prevents the solenoid from energizing if the gearshift is in anything but Neutral. Once it's running it has no function.

 

[trog100]

Re: idle speed..??

thanks again willy..<br /><br />the electric choke solenoid looks well worn and the centre drops out when it comes off so a manual conversion looks in order.. never have liked electric chokes anyway..<br /><br />i think the engine does have an alternator.. a diagram i have on it shows one.. so thats one more thing to slow it down..<br /><br />i think i know enough about the little bugger to be going on with and your comments about the 20' jon boat give me some heart.. he he<br /><br />thanks again..<br /><br />trog100