I wanna put some new valves in my old training bike - 2010 CRF250R.
My main question is, what parts I should buy - what parts I should replace?
FASTHEADS offers a rebuild, were they use the follwing parts:
Beryllium Copper Intake Seats, Bronze Manganese exhaust guides, Chromium Nitride Coated Ti intake valves, Kibblewhite Black Diamond exhaust valves, OEM springs.
They change the intake seats to actually match the titanium intake valves (stock seats are not perfect for the Ti intake valves) New exhaust guides, because they are mostly gone because of the rocker arm They leave the intake guides and exhaust seats (probably just re-cut them).
Thats what I have on my list:
New titanium intake valves - Del West or Xceldyne ? New intake seats - Beryllium Copper or MoldStar®90 (Beryllium-Free Copper) ? New exhaust valves - OEM Honda or Kibblewhite Black Diamond ? New exhaust guides - Bronze Manganese or MoldStar®90 (Beryllium-Free Copper) ? New valves springs - OEM Honda or...? When everything is true what they say about the MoldStar 90 stuff it's better than BeCu.
Is this enough or should I replace everything seats and guides intake/exhaust?
Any advantages if I go all titanium intake plus exhaust valves? Don't think so...
Thanks in advance
So yesterday i was a little bored and had to rebuild the spedo/headlight unit on my bike, and as the liquid nails was drying i saw the stock seat in a box off to the side. being 5'6" and 135# i know i'd almost never use it opposed to my gel seat, so i decided to "shave off some foam.
Anyone who was wondering about doing this mod and worrying about it coming out bad, dont, i took 20 mins with a razor and a stapler and had it done in no time:
well hee it is stock and before i got to hacking
And i tried to pull out some staples, but i really didnt wanna fuss with that. and i figured since ill be taking out material that would yield more seat-cover-overlap, so i'd have plenty to staple if i just cut it off:
once the seat cover was off i roughly sketched a 2-2 1/2 mark as to how deep i'd go. i then made a cut out to the back and one up towaeds the tank tapering until it evened out with the stock seat. i tried to peel and cut, peel and cut for about a minute, but well that way sucked and wasnt very efficent, so i started to just cut straight down to my depth line in 1-2" segments and then would just cut that piece out and so on the whole way down:
I continued until it was done... crappy but done. i was going to try to smooth it out, but taking small chuncks out of there with a dull razor is not easy. you just rip it. so since i wasnt gunna use the seat anyway i decided to go ahead and cover it. to cover it i put one staple on each end in the center to ensure i didnt put it on crooked. then i did 3 or 2 staples towards the center from one side to the other. with 2 inches of foam missing from the middle you really have to pull hard to suck it down. i finally got it done, and notcied that i shoulda smoothed out where the cut part meets the stock part, but oh well, i'd be easy to re-do. anyway i dont think its too bad for a short guy and 20 minutes...
oh and be sure when you staple it back down you push real hard and squarely with your stapler or it wont work.... pull fabrick, hold it in place with stapler, and squeeze if you try to hold tension with your hand and staple behind it, it usually dosent work out too well
and yes there is about a 1/2 inch gap between the seat and fabric in the middle of the bend...