Im planning on building up my 400ex just a little bit this summer, planning on just going to a 86mm 11:1 piston (either wiseco or JE, not decided yet...) and use a stage 2 hotcam. current mods are big gun full exhaust, srp +4 timing key, and amr coil. the bike is setup for woods racing (average skill level, placed toward the mid/front of the pack in gncc's/harescrambles on my old 250r).
suspension is pretty much done on my bike, just need to get the power up to par with the rest of the group. I get eat up bad in the fast field and light woods sections of the races, and im looking for more power in the mid and topend rpms. ive done lots of reading on here and decided the setup I have in mind should suit me well. motor is bone stock right now, 2000 model with ring/valve seal job couple months ago.
but enough talk.......my question is should I buy my stage 2 cam a little while before I do the piston upgrade, or just do em together? my main concern is doing the break-in......not 100% sure, but I know your suppose to break in the cam by holding it at a steady, moderate rpm for a few minutes, where as with a new piston/bore you are supose to vary the rpms alot. seems like there might be a little issue when breaking in a new cam and a new piston/rings together.........or am I just overly thinking this