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[QUOTE="skipn8r, post: 1224275, member: 52414"]
That's an interesting combo.  The '01 uses a flat-top piston while the '05 piston is domed...  There may be other differences as well.  Did you check the squish clearance?

The Service Manual recommends packing grease and Moly 60 paste around the different powervalve drive shaft components (parts 11, 12 and 14 below) during assembly to seal the clutch area off from the exhaust port.

[IMG]http://www.planethondaracing.com/hondaparts/images/schematic/cr250/cr250-exhvalv-00-01.gif[/IMG]

If this isn't done properly, exhaust pulses can pass through the PV drive assembly and into the clutch area and could cause some tranny oil to be blown out of the crankcase vent.  Here's what mine look like before assembly.

[IMG]http://www.asrcorporation.com/motorcycles/images/03CR250/Engine/CaseGreased.JPG[/IMG]

[IMG]http://www.asrcorporation.com/motorcycles/images/03CR250/Engine/CylinderGreased.JPG[/IMG]

On the Mikuni, the screw with the lock-nut is the idle adjust screw.
[IMG]http://www.asrcorporation.com/motorcycles/images/03CR250/MikuniIdle.JPG[/IMG]
[/QUOTE]

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Which ocean is California closest to?