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CR125R spark plug on my 07 cr125r

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hi everybody. I just bought and 07 cr125 and it is running A1. Only problem i had with it is the fact that i keep burning spark plugs (i am on my third one and i bought the bike 2 weeks ago). I currently run a br9eg. I am mostly riding on the track, but i sometimes ride on enduro trails. What is the best spark plug i could buy in your opinion? thanks a lot.

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That type of spark plug is fine,

the plug is no doubt getting fouled/shorting out while you are trail/off-roading due to lower combustion temps versus MX track riding.

Fine tuning the jetting for that usage (usually leaner pilot jet and needle settings)

and picking a well suited premix oil (not a 'racing' type oil) will likely fix that,

of course that's pending there are no mechanical issues with the engine (good compression, reeds, no air leaks etc etc.)

 

Edited by mlatour

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14 minutes ago, mlatour said:

That type of spark plug is fine,

the plug is no doubt getting fouled/shorting out while you are trail/off-roading due to lower combustion temps versus MX track riding.

Fine tuning the jetting for that usage (usually leaner pilot jet and needle settings)

and picking a well suited premix oil (not a 'racing' type oil) will likely fix that,

of course that's pending there are no mechanical issues with the engine (good compression, reeds, no air leaks etc etc.)

 

Thanks a lot! I saw that i could change the spark plug to an iridium spark plug (ngk br9eIX) would that help me?

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Yes a BR9EIX would help as the fine tip is more resistant to fouling if your jetting isn't spot on 

but isn't a definitive cure if the settings aren't in the ball park for your usage (off-roading)

 

We are also experiencing warmer weather than usual this summer:

higher ambient temps = less dense air = requires leaner jetting

 

Edited by mlatour

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Keep in mind that the float height must be checked/adjusted before any attempts in fine-tuning the carb.

 

Taking into consideration the slower pace / inclines / off-cambers encountered while off-roading, it's common to set the float a tad lower than specs.

 

Edited by mlatour

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8 hours ago, mlatour said:

Keep in mind that the float height must be checked/adjusted before any attempts in fine-tuning the carb.

 

Taking into consideration the slower pace / inclines / off-cambers encountered while off-roading, it's common to set the float a tad lower than specs.

 

Thanks a lot! You really helped me. Maybe you will see me this summer at SRA!

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Yes I've been going a lot at SRA this season, either Mondays or Fridays, but never on weekends.

I'm on a YZ125, blue with yellow number plates.

Edited by mlatour

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12 hours ago, mlatour said:

Yes I've been going a lot at SRA this season, either Mondays or Fridays, but never on weekends.

I'm on a YZ125, blue with yellow number plates.

Nice! And i will be on my cr125

997B0977-70F9-4249-ACAF-D478544D34C8.jpeg

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