Need Help with Messed up cam install
#1
My 19 year old son put a race cam (only) in his stock '01 400ex without consulting me or an engine builder. Upon startup, he bent 2 intake valves. He called the cam manufacturer (webcam) and was told he needed different valve springs and guides. He took the parts and head to the local honda dealer, who installed them into the head, along with 2 new valves.
Last nite he re-installs the head, and, upon startup, hears the same clacking noise (like piston to valve contact) that he heard b4.
Shld we take the whole bike to the dealer for diagnosis? Replace the piston? with what?
Help!
Last nite he re-installs the head, and, upon startup, hears the same clacking noise (like piston to valve contact) that he heard b4.
Shld we take the whole bike to the dealer for diagnosis? Replace the piston? with what?
Help!
#4
#7
I agree with the last comment. The big cam needs a piston. Now for the next problem...With the big cam in the 400ex, you need valve springs. Problem is, most of the springs on the market have way too much seat and lift pressure for your application. What problems can you expect??? The rocker arms will fail. Either get springs with a lower installed height pressure or you will need the rockers hard faced.
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#8
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#10
dont listen to the hard facing thing ...ive been racing a 450lrd built ex for the hole season and just took off my head cover yesturday to adj timming and my rockers look perfect and Im runnig a preety rad cam ...and second if you do were out the rockers in five years or so you can buy new ones cheep