I see there are two .30 alu and one .10 copper shim in it, do i remove the copper shim after the breakin? I have heard some says using Cyrul breakin method work best on Novarossi base engine and alot of guys around here were using his method too with great success. I really dont know which is the best pipe for this engine by now i have nova 9886, rb 086, picco 7206 and ninja fls 2053. I will try the ninja for breakin this engine, what other pipe are recommended?
Leave the shims the way it is if using 25% fuel.
You got a few options, Nova Rossi/JP EFRA 2015 with a medium conical header, the Max 2018 pipe set also works good with this engine, the pipe that will give you the most power will be the 2052 but it burns more fuel, and if run time is not an issue then go with the 2052, now on your existing list of pipe the best will be the 9886.