Shimming valves - a couple of questions.

[Brick-top]

Guys,

I am going to install E cams in my S motor, and check the valve clearances.

Will they be much different after installing the E cams? as I can't necessarily get the shims the same day, so may have to run the E cams with whatever clearances I find after installing them - presumably if they are close to tolerance it's no big deal to run them another 30 miles.

How do people generally measure the shims that are already in there? I have taken the shims out of an old head that is knackered, 2 of them are clearly marked up i.e. 370, but 2 of them appear to have no marking on them at all. Is this a caliper job? How accurate would the calliper need to be?

Cheers,

Con

[ptgarcia]

Yes, its a caliper job.

And I personally wouldn't run the bike with valves out of spec. I'd wait to do the job when I had the proper shims in hand.

[Brick-top]

What about the differences in the cams? Will the clearances differ between E and S cams?

[waterloodrz]

They can be different in any cam change.....even if you swapped one set of "S" cams for another set of "S" cams................they could also be spot on/you won't know until the clearances are checked.

[james509]

They may differ some but they should be pretty close. Just changed an S to E cams and didn't change a one.