SuperMoto Junkie banner

1 - 3 of 3 Posts

·
Premium Member
Joined
·
6,598 Posts
plug colour method can be deceiving, especialy on bikes with modern EFI systems.

some EFI systems stop injecting fuel and retard the ignition when you roll off the throttle, this means the bike will temporarily run lean which can affect your plug reading.

plug readings are only valid for the most recent engine operating condition and running the engine under different conditions can erase marks previously left on the plug. relevant information is gathered by running the engine at high speed/full load, immediately cutting the ignition off and stopping without idling or low speed operation and removing the plug and checking it. otherwise you can get mixed results/incorrect readings.
 

·
Registered
Joined
·
849 Posts
Yeh, as above, man with plenty knowledge :thumbup:

I'd say looking lean though... you're aiming for a milky coffee/tan; as above, try a plug chop.
 
1 - 3 of 3 Posts
Top