Bike/pit starters for race bikes, or just help with old bike starting, do you have?

[KNUCK]

I have some Harley race bikes and looking into these type of wheel starters to get them going easier and some have no kicker. What do you have or recommend or what should I stay away from? Don't really want to make one as it is not what I want to spend time doing.

I recently saw quite a few at Laguna Seca in the paddock during the AHRMA race. Some gas engine powered and some electric off a car battery. Even one powered by generator! Seen a new one called Bike starter for $870 2.5 kw