Chainsaw Repair

As a rule on an 028 being the same design as the 038 the transfer should open at about 20 degrees of rotation behind the stock opening of the exhaust port .This is an educated guess on my part because I've never done any port work on that model .Got one in the shed though to do some day .

Give you a little hint .They make a tiny thin high intensity LED pencil thin flash light that  takes AAAA batteries .It's small enough you can peer right through the spark plug hole and with no problem see when the ports start to open .Best light I've ever found .