I tried for 3 days to pull the flywheel/rotor/magneto on a 50cc engine with a standard gear puller with no luck. With this tool I got it off in 3 minutes. Having the right tool makes all the difference. If you want to work on 4 stroke engines, save yourself some aggravation and buy one of these.
If you buy this puller don't expect it to fit an old Mini Trail 50 even though the developmentally disabled Dennis Kirk website says it will. Looks like a high quality puller but it had to be returned because once again I was let down by the lame Dennis Kirk website. Remember the old days of printed catalogs when you could actually get what you were looking for?