what do you all think---should I get this for my 4 year old son

I am in the process of rebuilding a Honda 110 trike for my son...long story, but essentially I am disassembling the whole motor because I dropped the circlip in the the cam chain area and couldn't get it out with a magnet, flush with gas, etc...

I did come across this on cl...going to look at it tonight.

parts are available, rather inexpensive:

http://phoenix.craigslist.org/nph/mcy/4350397465.html