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Bikeman's... CPC's are way conservative. Keep in mind that the bigger the bore, the more wash needed.
 

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Bikeman's are closer to correct. Some would feel their correct piston is a bit lean for multi mile wfo runs.
 

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Been trying to get a handle on reading piston wash myself. This is a pic of the piston from my stock xcr800 with 440's for main jets.

 

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My 02 800 looks like the bikemans example and runs usualy no more than 1150 on the EGT.[/b]
CPC's normal is conservative (rich). Bikeman presents a better example. Adrien, your post is exactly why you shouldn't rely solely on EGT readings. Probe placement and other factors can effect the EGT reading. Once you have established the desired wash pattern make a note of the EGT readings. Once you establish the baseline for your setup, you can then use EGT's to monitor the state of tune.
 

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Mine look like the bikeman pic, only maybe a little leaner yet. The cpc pics are pig rich no matter what the bore size is.
 
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