finish up rupp72 valve clearance. we decided to go with a newer cam that has the larger base circle and lift. wanted a cam that would still work well with a 19mm dellorta,factory header pipe and with the gearing the bike comes with and without a jackshaft there's not much gearing a person can work with. maybe larger rear sprocket. use this cam in the pass and seems to pull real hard up to 4500+ rpm's
with a bigger base circle i really didn't want to take all the material off the tip of the valve.
found a real simple way to grind the lifter down. fab up a small V channel out of a piece of angle and square it up with bench grinder. then just lightly spun the lifter against the grinding stone. after that i just chuck it up in my lathe and use a small square end grinding stone in the tailstock.
lifter ends came out real nice and square...:thumbsup:
couple options for aftermarket retainers/keepers
briggs animal, dynocams(need to machine a small area of the retainer for the spring to fit correct),or motorsports retainers(heavy duty)
briggs animal parts work the best. no modifications...:thumbsup:
valve clearance came out good, .007 tight on the int with a feeler gage and right on .007 exhaust.
with the briggs animal retainers and 16 pound springs combination everything fit just perfect.
before i set the lifter clearances went ahead and clean up the bowls little. didn't go crazy on this part. parts of the bowl area can be real thin aluminum.
also plug up the governor hole.
nate you should be ready for the next step.........:thumbsup: