Help Needed: Fouled plug and poor running - Honda Rincon Forum : RinconRiders Honda Rincon Forums
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post #1 of 38 (permalink) Old 01-06-2017, 02:37 PM Thread Starter
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Help Needed: Fouled plug and poor running

Hey folks. I'm at my wits' end with this machine. It's a 2007 Rincon, and praise God I haven't had a minute's trouble out of it until now. This booger is driving me crazy. Here's a rundown.

It started running poorly. It cranked good, idled fine, but it wouldn't open up (top speed of 12 to 18 mph) and got seriously weak (wouldn't even climb hills).
I put a new plug, new air filter, pumped all the gas out of the tank, ran Chemtrol and Lucas through it, and it stills fouls the plug and has very little power.

Anybody know what I should look at next? I am not a mechanic and not really mechanically inclined either, but I can follow instructions like a good grunt. I'd like to avoid a trip to the Honda dealership if possible.

Thanks for any help anybody can offer.
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post #2 of 38 (permalink) Old 01-06-2017, 04:41 PM
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You have changed everything but that OLD dirty fuel filter inside the fuel pump. Betcha!


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03 Green, UHMW skid, Aluminium products bash plate and stick guards, CDI, Warn Winch and 52" Plow. ITP XTR 26 x 10 /12, Rear Trunk that holds more than 36 beer. Stock wheels cause there is nothing lighter! and over 20,000 KM's with a stupid grin on my face 2017 New piston, rings cam, tensioner, AMSoil 0/40 Synthetic. Like I have a new Rincon 14 years later!
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post #3 of 38 (permalink) Old 01-07-2017, 10:51 AM Thread Starter
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You are correct. I did not change the fuel filter. With the plug fouling like it is, I was figuring it was getting plenty of fuel. You reckon that would be a worthwhile change anyway? I got to start somewhere.
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post #4 of 38 (permalink) Old 01-07-2017, 04:51 PM
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yessir... an over oiled air filter can add to the mess.... what color is the foul?


Whatever in life be your goal, keep your eye upon the doughnut and not on the hole.

03 Green, UHMW skid, Aluminium products bash plate and stick guards, CDI, Warn Winch and 52" Plow. ITP XTR 26 x 10 /12, Rear Trunk that holds more than 36 beer. Stock wheels cause there is nothing lighter! and over 20,000 KM's with a stupid grin on my face 2017 New piston, rings cam, tensioner, AMSoil 0/40 Synthetic. Like I have a new Rincon 14 years later!
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post #5 of 38 (permalink) Old 01-07-2017, 05:12 PM Thread Starter
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Ten four, then I'll stick a new fuel filter in.

As for the air filter, whether it is or isn't over oiled I can't say, but I can say that it has plenty of oil in it. I bought it from Honda, preoiled (I guess it's called), but it is definitely oily. I call the plug fouling black, but if the colorization can offer additional clues as to what's wrong with the machine, I'll check it again Monday and let you know for sure. It is definitely a dark fouling, though.

Oilcan, thank you for your help. I definitely appreciate your time.
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post #6 of 38 (permalink) Old 01-08-2017, 07:37 AM
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Black indicates "wet" could be numerous things, but basics first. When you start it, are you pressing the throttle?

Wet fouled spark plugs can be caused by flooding the engine when attempting to start a cold engine

On a fuel injected quad, it is not necessary, as it has an auto choke and is controlled by feedback sensors. Ideally you should start it, and by the time your boots and other gear are on, it should be warm enough to ride.

Burping the throttle on the FI ATV's is not good as they easily flood (causing stalling problems)


Whatever in life be your goal, keep your eye upon the doughnut and not on the hole.

03 Green, UHMW skid, Aluminium products bash plate and stick guards, CDI, Warn Winch and 52" Plow. ITP XTR 26 x 10 /12, Rear Trunk that holds more than 36 beer. Stock wheels cause there is nothing lighter! and over 20,000 KM's with a stupid grin on my face 2017 New piston, rings cam, tensioner, AMSoil 0/40 Synthetic. Like I have a new Rincon 14 years later!
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post #7 of 38 (permalink) Old 01-08-2017, 11:17 AM Thread Starter
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It isn't my habit to give it gas when starting it. I won't say that I haven't done it from time to time as a "give it gas to crank it" action. For the most part, it has never had any trouble starting up, and it idles fine too. It just won't pick up speed and has no power regardless of its speed. I mean it's weak creeping and it's weak at its new top speed, which isn't very fast.

I have ran it cold plenty: starting and driving without little it warm up. I don't know if it matters or not, but this problem started back when it was in the 90s here. It wasn't a cold weather issue, although the colder weather may have made it worse (or it might've been progressive and was always going to get worse).
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post #8 of 38 (permalink) Old 01-09-2017, 06:54 AM
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If after you change the filer and she is still acting up, next step would be to examine the electrical. A poor connection at plug, wire/boot etc... (can cause poor combustion) which can also cause a wet foul. But like I said, lets cover off the easy stuff first... $$

Your engine oil is used in the trans for pressure. Until the oil is warm, you will have lower pressures at your clutches which causes them to slip. Running it cold is not recommended


Whatever in life be your goal, keep your eye upon the doughnut and not on the hole.

03 Green, UHMW skid, Aluminium products bash plate and stick guards, CDI, Warn Winch and 52" Plow. ITP XTR 26 x 10 /12, Rear Trunk that holds more than 36 beer. Stock wheels cause there is nothing lighter! and over 20,000 KM's with a stupid grin on my face 2017 New piston, rings cam, tensioner, AMSoil 0/40 Synthetic. Like I have a new Rincon 14 years later!
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post #9 of 38 (permalink) Old 01-09-2017, 09:10 AM Thread Starter
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Amen. Easy is where I want to start for sure. I have noticed that slipping on our coldest mornings (probably not cold by many's standards) when I'm leaving my blind. That's probably its coldest/fastest start and run situation. I'm going to try to take it out today and get a new one if it's an in-stock item. My prayers are said and fingers are crossed that the filter will cure it. If not, I'll check whatever you think is next in line. Thanks again for the help.
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post #10 of 38 (permalink) Old 01-10-2017, 04:34 AM
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All of the above as Oilcan indicated, but also run some Sea Foam in your fuel tank....it certainly can't hurt. I use it religiously in everything I own!!
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