velociraptor350
Well-Known Member
If you have to rejet for mods you have done to your bike, your going to have to know how to read a spark plug. This site will show you how to do exactly that to tell if your too lean or too rich.
http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html
The trick to doing a "plug chop" is simple. Install a fresh spark plug, and go do a WOT (wide open throttle) run through like 3-4 gears and then just kill the motor without letting off the gas. Coast to a stop, pull your plug and compare it to the chart above, it will let you know how to jet, either up or down. Always use a fresh plug on every run so you get the best possible reading.
http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html
The trick to doing a "plug chop" is simple. Install a fresh spark plug, and go do a WOT (wide open throttle) run through like 3-4 gears and then just kill the motor without letting off the gas. Coast to a stop, pull your plug and compare it to the chart above, it will let you know how to jet, either up or down. Always use a fresh plug on every run so you get the best possible reading.