Hi. My son has an '08 DRZ70 with low hours. It started running very rough (almost unridable). It smooths out nicely if I put the choke on. The plug looks good. I took the carb off the bike and cleaned it the best I could (I couldn't split the carb, but I sprayed cleaner into all openings), but it didn't help at all.
We don't ride as much as we'd like, so the bike will sit for a few weeks at a time. I guess my next steps are to replace the plug and perhaps drain the gas tank and put new gas in it. Any other suggestions or possible problems? Could it be something electrical? (I suspect not, because if it was electrical then it would probably run poorly regardless of whether the choke was on or not, right?).
