Spark plug heat range for CFMoto 250T-F?

[joema]

My friend has a 2009 CFMoto 250T-F. The manual specifies DPR7EA-9 spark plugs. He lives in a cooler climate and is trying one heat range hotter plug, DRP6EA-9. He was curious about any long term durability issues. He always uses premium fuel.

It's a 244cc single-cylinder, 4-stroke, watercooled, carbureted engine with CDI ignition. Compression ratio is 10:1.

Does anyone have any comments or suggestions on what spark plug heat ranges they have tried or what works best on this engine?

[ishie]

are you done with this one? i have the same trouble and asking for your help.. please response asap if you can. thanks in advance. ive been also asking on where to find some motorcycle spark Plug tools.