question for rodbolt

[edjr]

you said that the black enamel look on plugs is usually caused by cool combustion temps and/or to much oil and to check for water on the plugs by a color on the electrodes....if there is no sign of water what will be the remedy of to much oil...also could older oil cause this same enamel look?

 

[rodbolt]

Re: question for rodbolt

I doubt it. its caused by incoimplete combustion. if your engine has red plug caps check them if its a 2.6 litre v6 check the recirc valves.

 

[edjr]

Re: question for rodbolt

i have a yamaha 86 prov 150 ..im new to outboards could you please explain recirc valves.it isnt real bad but there is noticeable black enamel around the bottom of the plug the center of the plug is tan and there not real wet.im not very knowledgable mechanically but if theres a probelm i like to understand if i take it to a shop that im not getting raked over the coals.thank you for youe time

 

[rodbolt]

Re: question for rodbolt

sounds normal to me<br /> the plug shell is cooler than the plug insulator. a tan colored to pinkish colored insulator is normal. the carbon on the shell is as well.<br /> the recirc valves are oneway check valves pressed in the block and lead into the intake ports. follow the small gray hoses from the intake to the block just fed of the head surface. there are 6 of them. test with a syringe full of alcohol. should flow only one way.no flow indicates they are clogged and flow both ways indicates its bad. I cant remember if the proV of that year had resistor caps or not. if they are orange they are. if black most likly not unless the oil module has been updated with the kit that has the black resistor caps.

 

[jafa]

Re: question for rodbolt

Theres a post in the johhnyRude forum Topic: wet fouling plugs (89 evinrude 40HP O/B W/VRO <br />and the plug looks identical to mine , and I suspect edjr's . If you can read upside down its a NGK BR8HS. Is this type of fouling unique, or more common, to NGK's ? I havn't got my hands on a timing light but she uses about 1 litre to about 65 litres of fuel, or just over a litre to 75 litres of fuel on mixed running.

 

[rodbolt]

Re: question for rodbolt

rockhopper<br /> the fouling in that picture looks due to a cold running or excessivly rich running engine. if its a fouling problem that repeats on a particular cylinder you have to use a process of elimination. yes using an NGK plug in a jonnyrude may lead to fouling. the jonnyrude ign system is designed to use a QL series sparkplug in later years. theR series NGK plugs use a carbon resistor to help eliminated EMI the champion QL uses an inductive resistor to achive the same results. what motor are you fighting a fouling problem on. I am assuming your saying 1 litre of oil to 65 litres of fuel. that would be just above a 50 to 0ne ratio which is about right. if my math skills have not deterioated to badly I believe 50 L fuel per 1L oil is still 50/1 fuel/oil mix.

 

[edjr]

Re: question for rodbolt

my plugs look nothing like that...mine look alittle enameled around the top of the threads but the insulator ( middle of the plug ) is tan...i need to change my oil then ill check to see what kind of ratio it will figure out to.i do know that im not getting good gas mileage(acually real bad)but with the fun we've been having its worth every penny. i also have ngk plugs will there be a probelm if they dont have the r series my local dealer didnt have the r series in stock and he said that it will be ok mabye a little static in a radio but other than that no probelms???