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Discussion Starter · #21 ·
Since I have moved to flat top KTM 64mm piston I needed a new head profile, luckily its modified to acept inserts, so a new insert in order.

old one:
IMG_20211121_145729 by Milos Balunovic, on Flickr

divorced
IMG_20211121_145959 by Milos Balunovic, on Flickr

new one
IMG_20220524_220751 by Milos Balunovic, on Flickr

made it 13.5 compression. 0.7mm squish and 50% squish area. (old one was 11.5 comp and 40% squish)
also notice how the sparkplug outer part is shortened, on picture not finished but basically you cut of all the way to thread, that exposes the "sparking" part more in to the stream and makes it ignite cleaner/faster (a Moto GP trick shared by FOS - who knows who he is will know :D )
IMG_20220524_220751 by Milos Balunovic, on Flickr

some videos after starting as soon as I get it on YT.

ps check the older posts, I updated some info and added more pictures.
 
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