1998YZ 250 fouling plugs

ncarr52
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ncarr52
I got a new to me yz 250 and it keeps fouling plugs and bogs out in First and second gear the rest of the gears are fine and 15 minutes later it fouls a plug anyone know anything
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wildbill
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wildbill 8/1/2020 6:47pm
8/1/2020 6:47pm
Rejet it!
What's your elevation?
Talisker
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Talisker 8/1/2020 6:50pm
8/1/2020 6:50pm Edited Date/Time 8/1/2020 6:51pm
If you are fouling plugs you are either way to rich, gasket leak, or you need to clean your carb and replace the jets. Make sure the float height is correct.
MZ193
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MZ193 8/1/2020 6:54pm
8/1/2020 6:54pm Edited Date/Time 8/1/2020 6:55pm
You're too rich.
Which spark are you using?
If you don't know how to jet and you don't want to spend your money, some sparks are better than others, the bike is a little slower but at least it won't bog.
ncarr52
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ncarr52 8/1/2020 7:11pm
8/1/2020 7:11pm
MZ193 wrote:
You're too rich. Which spark are you using? If you don't know how to jet and you don't want to spend your money, some sparks are...
You're too rich.
Which spark are you using?
If you don't know how to jet and you don't want to spend your money, some sparks are better than others, the bike is a little slower but at least it won't bog.
I’m using a ngk Br8es sparkplug

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zehn
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zehn 8/1/2020 7:20pm
8/1/2020 7:20pm
What needle clip position are you using
Moto Mofo
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Moto Mofo 8/1/2020 7:25pm
8/1/2020 7:25pm Edited Date/Time 8/1/2020 7:26pm
Replace the clutch side crank seal. Might as well replace both, while you’re at it.
4
TBOLTUSA
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TBOLTUSA 8/1/2020 7:46pm
8/1/2020 7:46pm
Raise the needle clip on position
Make sure your running a clean / properly oiled air filter
zehn
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zehn 8/1/2020 7:49pm
8/1/2020 7:49pm
TBOLTUSA wrote:
Raise the needle clip on position
Make sure your running a clean / properly oiled air filter
Yep exactly what I was getting at
Gravel
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Gravel 8/1/2020 8:09pm
8/1/2020 8:09pm
Moto Mofo wrote:
Replace the clutch side crank seal. Might as well replace both, while you’re at it.
^^^This is where I start before rejetting ^^^

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