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Old 06-23-2010, 02:43 PM   #1
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Default 92 Yamaha fouling plugs

Guys, my neighbor at the campground has a 92 yamaha golf cart that we are having problems with. Every once in a while it will foul a plug, sunday he was driving it and stopped to visit and when he went to take off the plug was fouled. This happens a couple times a year. All the maintance has been done, new air filter fresh oil change, fuel filter, valves adjusted.
If you put a new plug in it it will fire right up and away you go, it only happens a couple times a year but its driving him nuts . Other than the random fouling of the plug it runs great the rest of the time. Anyone got any ideas? One other question, in the yamaha parts look up a g8 and g9 take different spark plugs? but in the sticky there is a g2-g0 sticky wich calls for the same plug?
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Old 06-23-2010, 05:57 PM   #2
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Default Re: 92 Yamaha fouling plugs

According to Nivel.com the G8 & 9 use NGK-BR4ES for 91 and newer and NGK-B5ES 90 and earlier. The R in BR4ES stands for resistor type plug. The 4 is the heat range spec. 5 being a cooler plug and a 2 is about the hottest plug you can get. I don't recommend going to a 2 for that cart.

As for the fouling... Is there evidence of oil on the plug? If so it's probably rings if not then its possible that the igniter coil is going bad.
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Old 06-23-2010, 07:44 PM   #3
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Default Re: 92 Yamaha fouling plugs

Yes Yamaha's started with a B5ES, then whent to a BR4ES. G16's and up came with BPR2ES and thats all I install in Yamaha 4 cycle engines (G2/G9/G8/G5/G14/G16/G22 and now the drive) the hot spark plug doesn't hurt anything. As for the fouling problem...Are you useing a NGK? If you try a Autolite or Champion...your bond to premature fouling. Is the spark plug oil soaked, carboned?
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Old 06-24-2010, 06:45 AM   #4
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Default Re: 92 Yamaha fouling plugs

I don't want to thread jack, but I am having the same issue with my uncles cart. His has excessive carbon on the plug, and I have gone thru the carb and fuel pump on many occasions looking for the problem. I think his issue his he does many short runs and never really gets the engine hot, but that is just my theory.
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Old 06-24-2010, 09:15 AM   #5
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Default Re: 92 Yamaha fouling plugs

The plugs are not oil soaked or carbon on them, they are just plain foulded out. I believe the last one he put in was a champion plug and it was a br5, so i think i will pick up a br4 in ngk and try that.

Thanks for the input guys.
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Old 06-24-2010, 02:03 PM   #6
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Default Re: 92 Yamaha fouling plugs

One quick question smallblock, If we go from the br5es to the BPR2ES is it a hot enough change in spark plugs to cause engine problems ie burn a hole in a piston? Id hate to have him put the plug in and then burn the motor up??
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Old 06-24-2010, 06:16 PM   #7
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Default Re: 92 Yamaha fouling plugs

Plugs are cheap try a 3 and see. Also is he using quality oil?
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Old 06-24-2010, 07:40 PM   #8
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Default Re: 92 Yamaha fouling plugs

Quote:
Originally Posted by TeamRMS View Post
One quick question smallblock, If we go from the br5es to the BPR2ES is it a hot enough change in spark plugs to cause engine problems ie burn a hole in a piston? Id hate to have him put the plug in and then burn the motor up??
Been useing them since 1996 (when g16's came out with them) and have never had a problem. Burn a hole in the piston?, probably only if your running "NITRO or ALCOHOL"
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Old 06-25-2010, 09:06 AM   #9
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Default Re: 92 Yamaha fouling plugs

Yep, running quality oil, but no nitro or alcohol, well theres alcohol in the cooler that rides in the cart . I think i will get a couple of the BPR2ES plugs and throw em in my tool box at the lake. Thanks guys for all the input and advice, i appreciate it.
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Old 06-25-2010, 09:22 AM   #10
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Default Re: 92 Yamaha fouling plugs

Quote:
Originally Posted by TeamRMS View Post
Yep, running quality oil, but no nitro or alcohol, well theres alcohol in the cooler that rides in the cart . I think i will get a couple of the BPR2ES plugs and throw em in my tool box at the lake. Thanks guys for all the input and advice, i appreciate it.

Remember, for better performance, use lots of ice in the cooler!

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