Ok! I am about to perform a engine swap on my 90cc dirt bike! I have a few questions for the experienced.?

1.) I see a lot of engines that look like they have almost the same bolt pattern as my bike. How can I be sure?

2.)If I get one that has a electric starter, other than a battery and the actual switch, what else would I need? (It is a kick start now)

3.)My bike is currently a 90cc and I am looking to go 125. What other mods would I have to make to make it all work the way it should?

Please only those who really know about this answer! I need some good advice right now before I start.

Thanks Tod I really apreciate it!

Yes there is alot of common engine now is 90 and 110.
and there have kit for big bore kit. and other too .
110 cc can change cylinder to 150 cc. You have to purchase big bore kit. and also 90 cc too.
They are copy from Honda engine 90 and 110 .

as for electric starter. I am not sure if the wire harness will work on electric system. if it does. You need to add voltage regulator because it will charge battery. And I am not sure if the stator have electricity for charging system. and control for starter button and kill switch swap. Check out the engine wire harness will fit on frame harness ( plugs , must be same style)
also you better ask dealer questions about upgrades, like big bore kit. Exhaust system. Carburetor. Cams. Etc

dude do yourself a favor and have a mechanic do the work. i do not believe that you have the skill to do it.