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cascao

Spark plug weired reading

9 posts in this topic

Posted (edited)

Anyone can help me with this spark plug reading? (movie below) There are two colors at isolator. Black portion is turned to the back of the bike and white portion turned to escape window. This new NGK BP5ES rode 20km. The bike is Sherco ST300 2015. The previous spark plug was an BPR5EIX and had a good brown color.

See the spark plug movie

Edited by cascao
foregin language woes

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Don't want these Ads? Why not sign up as a Trials Central Supporter.

I have a similar colour on our 280 G/Gas 2014 ive raised the carb needle one notch not checked it since

Would have expected a more biscuit colour especially just doing closed circuit trials

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A lot of modern fuels give strange plug readings.....

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But.... two collors on same isolator? 

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Posted (edited)

Why did you fit an ECU have you fitted EFi?.

Edited by oni nou
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No ECU! Good old CDI

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reed valve...piston rings...???????? just guessing...something strange going on in there is this same with any plug?....is resistor plug standard?

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Update: there was a leak on base gasket near reed valve. Changed base gasked a month ago and no more two colors on same spark plug.

 

Thank for everybody who posted here.

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