At this stage you'll have removed more blade plate bosses than I have Mark, so you obviously know how it has to be done.
If you don't get the decompressor working, your starter won't last long, and it will probably kick back - possibly to a dangerous extent. AFAIK all of the OHV engines have 8:1 compression and at least 20 degrees of ignition advance. On a 190 cc engine, that is not to be taken lightly.
