So it used to be a G or an L model. Get them synched once you're sure the valve lash is good. .001 to .003 cold. I used to have lots of old GS parts after my first one was retired. I finally dismantled it and tossed it in the scrap after the wife got after me for having it in the back yard being an eyesore. Love the shaft drive...just remember to keep the hub splines lubed.