Hawk 250-Fouled Spark Plug

FunkyChina · 10-27-2018, 08:39 PM

I'm at a total loss and need some help. I've been fouling spark plugs with my mikuni carb. I started with a 115 jet, went down to a 105. Still fouled the plug. Went down to a 100. Still fouled. Put in a 98. Same result.

Today, I swapped out the mikuni carb for the stock carb. Fouled the plug again. I opened up the air box to check the air filter, and the filter box and filter were wet. It appeared to be oil?

Plug is not wet. Just seems to instantly turn black.

I have no idea why I'm fouling plugs and experiencing major engine hesitation through all RPMs, save idle.

Can anyone tell me what's going on?

Red Hawk · 10-27-2018, 08:49 PM

What's the oil leval in the sight glass?

Do you turn off the gas when it's parked?

Is the plug wet with gas or oil. This part is important.

**JerryHawk250** · 10-27-2018, 08:50 PM

If the filter is wet it will have the same effect as running with the choke on. It can't get air and is flooding the engine.

FunkyChina · 10-27-2018, 08:51 PM

The spark plug is not wet. It's just completely black.

Oil is just over half in the glass.

I don't turn my gas off when parked.

FunkyChina · 10-27-2018, 08:52 PM

Should I try running it without the air filter in?

**JerryHawk250** · 10-27-2018, 08:54 PM

Quote:

Originally Posted by FunkyChina

The spark plug is not wet. It's just completely black.

Oil is just over half in the glass.

I don't turn my gas off when parked.

It's black because it is running rich due to lack of air flow because of the wet filter.replace the filter.

Red Hawk · 10-27-2018, 08:55 PM

Ya ! And a good flashlight in hand. See if there's anything coming out the crank case vent hose as you run the throttle up and down. That might be where the oils coming from.

**JerryHawk250** · 10-27-2018, 09:15 PM

If this is a new bike the create may have been laid on its side and oiled the filter. It doesn't take long to clog the filter when dust collects on it. I like to know how many filters I have changed on new lawn mower for the same thing.

FunkyChina · 10-27-2018, 09:41 PM

Ahh, yes. I bet that's it.

I'll try changing the filter and see if that helps.

I'll report back.

Thanks!

10-27-2018, 08:39 PM	#1
FunkyChina Join Date: Sep 2018 Location: Iowa Posts: 34	Hawk 250-Fouled Spark Plug I'm at a total loss and need some help. I've been fouling spark plugs with my mikuni carb. I started with a 115 jet, went down to a 105. Still fouled the plug. Went down to a 100. Still fouled. Put in a 98. Same result. Today, I swapped out the mikuni carb for the stock carb. Fouled the plug again. I opened up the air box to check the air filter, and the filter box and filter were wet. It appeared to be oil? Plug is not wet. Just seems to instantly turn black. I have no idea why I'm fouling plugs and experiencing major engine hesitation through all RPMs, save idle. Can anyone tell me what's going on?
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10-27-2018, 08:49 PM	#2
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	What's the oil leval in the sight glass? Do you turn off the gas when it's parked? Is the plug wet with gas or oil. This part is important. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
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10-27-2018, 08:50 PM	#3
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,562	If the filter is wet it will have the same effect as running with the choke on. It can't get air and is flooding the engine. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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10-27-2018, 08:55 PM	#7
Red Hawk Join Date: Jul 2018 Location: NEPA Posts: 273	Ya ! And a good flashlight in hand. See if there's anything coming out the crank case vent hose as you run the throttle up and down. That might be where the oils coming from. __________________ 2018 Hawk P&P Decked .040 off the head. 17/43 D.I.D. 428, NGK Iridium plug, DeCat, Wrapped pipe, Custom S.S. Muffler core, Nibbi PE30 115/35, L.E.D. Lights, Digital Cluster, USB port, Cutting Bord skid plate, Oil cooler w/ custom CRF oil filter inline, 5Wt fork oil, Rear Shock, CNC Back Rack, 30mm FAT bars, Bark Busters, ProGrips, Adjustable levers, Shinko 700’s lots of Loctite!
	0

10-27-2018, 09:15 PM	#8
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,562	If this is a new bike the create may have been laid on its side and oiled the filter. It doesn't take long to clog the filter when dust collects on it. I like to know how many filters I have changed on new lawn mower for the same thing. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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10-27-2018, 08:51 PM	#4
FunkyChina Join Date: Sep 2018 Location: Iowa Posts: 34	The spark plug is not wet. It's just completely black. Oil is just over half in the glass. I don't turn my gas off when parked.
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10-27-2018, 08:52 PM	#5
FunkyChina Join Date: Sep 2018 Location: Iowa Posts: 34	Should I try running it without the air filter in?
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10-27-2018, 09:41 PM	#9
FunkyChina Join Date: Sep 2018 Location: Iowa Posts: 34	Ahh, yes. I bet that's it. I'll try changing the filter and see if that helps. I'll report back. Thanks!
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