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Discussion Starter #1
So I bought a used 03 660 out of Las Vegas. The previous owner ran it at the dunes and it appears to have ridden fairly hard. I've taken it out a dozen times and it runs ok. I have a big guys trip planned to glamis. Next week and have been trying to tune it up to hang with some 450s. It can be difficult to start sometimes when cold but better when hot. I have to turn the idle screw up fairly high to about 1800-2000rpm until she's warm than I can lower the idle a bit but seems to kinda have an erratic idle. I pulled the carbs and found 27.5 pilots with the fuel screws 3.5 turns out and appears to be 160/165 jets. Ran it to top of 2nd shut it down and the plug looks a little lean. I've tried adjusting the fuel screw and doesn't seem to help the idle. I have a 167.5 and 170 coming in tomorrow. Any help would appreciated!!
 

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Discussion Starter #2
I forgot to mention. It has full Yoshi rs3 system, pro design with k&n no lid . New stock plug. Plug that was it was was step colder
 
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