I am preparing to undertake a performance mod. of my 00 EX. I intend to use a Weisco 11:1 compression piston in combination with a Web cam (the full race .378 lift cam). Web cam tells me that it'll require hardfaced rockers and shortened guides. They also mention the need to do a "full valve job" after installing the guides. Can anyone explain what this entails? Web tells me that I'll have ample valve-to-piston clearance...is this true? Has anyone undertaken a similar mod. that can offer advice?

 

i have a big bore kit in my '00 ex,ims piston,white bros cam,dynojet DJ155 and white bros says to use stock valve springs etc.replacment of followers etc.I really don't know much as i am not a mechanic and don't service my own machine but do have all the spec sheets on the work that has been done.pipe ported polished it screams and i hope your project works out for you. SAMMY

 

I believe WebCam calls out the entire Valve Spring kit for use with that cam. The kit includes the shortened guides. Here's the deal...The amount of lift that this cam generates requires you to run different springs which can be colapsed farther. They will probably have greater spacing between the coils than your stock springs. The shortened valve guides are needed for the same reason. The valve guides stick up out of the head casting slightly, and they need to be shorter since your valve retainer will be coming down farther.

They suggest having your cam followers (or rocker arms) hard-faced due to the higher pressure which will be placed on them. This higher pressure is due to the stronger valve springs.

As far as the complete valve job goes...since you are replacing the valve guides, the valves will be out, so there is no reason not to clean up the valve seats while it is apart.

Hope this helps.

 

I would drop back to a 450-451 grind. There is no need to replace springs or guides with this cam. the hard faced rockers would be a good thing.

99 426ex , Web Cam, FCR carb w/ twist, CT revlimiter, DMC exhaust, XCT's ,K&N, One kit, Renthal bars, DG nerfs, Armidillo Swingarm plate, 8 paddle Haulers, Laeger subframe, PRM bumper and grab bar.

http://www.trxoutlawz.com/

 

DUDE I HAVE THE 426 KIT IN MY EX...I WAS TOLD THAT IF YOU DIDNT GET THE HEAVY DUTY VALVE SPRINGS YOU WOULDNT NEED THE HARDFACED ROCKER ARMS...I WAS TOLD I WOULD GET LIL OVER A YEAR OUT OF IT RUNNING IT LIKE THIS...WELL, 3 DAYS AGO, I WAS RUNNING AT THE TRACK, AND ALL OF A SUDDEN,"KNOCK! KNOCK!" VERY LOUD KNOCKING,,IM ASSUMING I DID VALVE OR ROCKER ARM TROUBLE, I HAVE YET TO TAKE OFF THE VALVE COVER TO SEE, SO WHEN I DO FIND OUT WHAT HAS HAPPENED, I WILL KEEP YOU ALL POSTED SO WE CAN ALL LEARN FROM MY MISFORTUNE...LATER PEOPLE

 

the reason for a valve job is because it is impossable to get the valve guides at the same angle as before

 

When you do this, read the find print on the directions from Web Cam about which oil to run. They have found out that on the 400 for some strange reason DO NOTuse syntic oil. They don't know why, but you will have a hard time getting a full year out of the 400 if you race it very much.

 

Air, tell me, how good is that CT rev limiter?

 

My 400 is nearly two years old and I've been using Mobil 1 synthetic since it was new and I've never had any problems.

Scott