Just got my 2011 gasgas 300 made it into a 325 I am riding at 8000' in Colorado boy does it pull hard 4th gear on most trails smooth controllable power thanks zman for the info on how to do it.
I am glad you got it built and it is working well for you. Eric Gorr did all the work to figure it out and built my engine. Mine has been super reliable and I love it!
Eric has a new 76mm flat top piston he can use for his kits. The last piston I got from LA Sleeve weighed a ton! I spent about 2 hours taking extra metal out of it to match the weight of my previous piston that was no longer available. I will go with Eric's new piston next time I do a top end, but I will also need to get my head cut to match the flat top.