Originally Posted by ashtonsser No they dont require any modification. Only thing with the higher seat pressure is its obviously a stiffer spring and will put more pressure on the cam lobes and rocker arms. Might get a bit of accelerated wear over a long period of time. If its a daily use and gets a lot of miles I would go with the lighter seat pressure. The 100 lb seat pressure springs have been reved happily to 9500 with n1's without problems.
I was thinking about picking that set up from you man to save some bucks. Ill have to think about it a bit.
okay now when i checked mazworx site, it says the 130lbs need modification to increase net lift. will you need that if you will using the kelfords?