My next door neighbor just brought home a Toro CCR powerlite single stage (16" , 98cc 2 stroke) which he inherited from a family member. It apparently sat around for a number of years and won't start. He's used my Toro 2450 and thought that between the two of us we'd get this thing going. Base on experience I know the carb will need a cleaning or a cheap chinese replacement one. The fuel tank also has a lot of built up oil residue so we'll be cleaning that. I went to pull the plug and it required a lot of force even after a soaking with liquid wrench. I eventually got it out with a slow back and forth movement. The new plug, however, does not want to go in easily. It gets hung up real quickly and won't cleanly start. My gut tells me that it was probably cross threaded in the past. I don't want to ruin the head on his "new to him" machine so I didn't try to force it in. I thought about getting a spark plug chaser to clean up the threads but I have honestly never used one before. I know I need a 14mm one and to keep any shavings from entering the plug hole. It appears to be pretty staightforward, but I thought I should seek advice before actually doing it. Any do's and don't's I should be aware of? Thanks.