CR 500 ignition problem

[kevin_s]

Hopefully you hoons can help me.I bought a 90 cr500 with broken right center and outer cases.I rebuilt that engine completely bearings,seals,new cases,piston ect...
I was saving this engine for another project but my 98 500 decided to crack a piston so I bolted the 90 engine in the 98.

When I went to kick it for the first time and it kicked back and damn near broke my foot,my foot was purple for a week.Next kick it did the same thing.
So I guess I figured out why the cases were broken when I got it.

So,I swapped out the 90 stator and flywheel for the ignition off the 98 and it fired up first kick and is running very well.

Anyway's,my question is,What could be wrong with the 90 ignition system?

[CR500PHIL]

Hopefully you hoons can help me.I bought a 90 cr500 with broken right center and outer cases.I rebuilt that engine completely bearings,seals,new cases,piston ect...
I was saving this engine for another project but my 98 500 decided to crack a piston so I bolted the 90 engine in the 98.

When I went to kick it for the first time and it kicked back and damn near broke my foot,my foot was purple for a week.Next kick it did the same thing.
So I guess I figured out why the cases were broken when I got it.

So,I swapped out the 90 stator and flywheel for the ignition off the 98 and it fired up first kick and is running very well.

Anyway's,my question is,What could be wrong with the 90 ignition system?

I am wondering if the timing was advanced too much - have seen this cause severe kickbacks.

[2strokeforever]

bomb start it till you get it figured out, unless you want to break your cases or foot

[kevin_s]

bomb start it till you get it figured out, unless you want to break your cases or foot

It would just lock up when I tried that,but thanks for the idea.

[2strokeforever]

try 5th gear