Confused about my crank?

[02Banshee88]

The previous owner of my 2002 Yamaha Banshee said there was a 10mil crank in it. However, after talking to someone I know who grew up working on banshees, he saying that a lot of things on my bike are pointing to the fact that it does not have a 10mil crank. He said there would be porting, aftermarket carbs, a pingel fuel valve, reeds, etc. Also, mine has FMF pipes which he said most people that build a stock cylinder 10mil crank aren't usually going to run FMFs because it would be a pretty extensive build and it'd be easier just to buy a full aftermarket setup. My question is, since I am a noob when it comes to workin on banshees as this is my first one I've had, how can I take it apart to check and see if there is or is not a 10mil crank in it? Obviously checking the crankshaft, I know that much, but I don't know what to look for that will tell me if it is a 10mil crank. Thanks in advance because this is really puzzling me.

Edited February 8, 2016 by 02Banshee88

[trickedcarbine]

Fast hillbilly way, drop a dowel rod down the spark plug. Use the kick starter to slowly cycle the dowel rod up and down. Mark the dowel at its highest and lowest point in the stroke. Now pull the dowel out and measure the distance between the two points. 54mm is stock, 58mm is +4mil stroker, 61mm is +7mil stroker, 64mm is +10mil stroker, etc.

[02Banshee88]

Thanks guys!

[trickedcarbine]

Helps to put a straight edge a cross the head and rest what you are using to mark right on it.