Nc30 valve shim advice

[Morespeedvicar]

Hi,
I've been checking me shims tonight on me nc30 and the two of the front exhaust valve clearence is to tight, the gap ( for both) is too tight for a 0.20 feeler and a 0.15 one is a nice sliding fit. Just wondered how much you'd reduce the shims buy to get the correct gap, ie go for a .05 reduction or maybe 0.10, tho would this be a bit big?
Many thanks.
Ian

[Neosophist]

Shims come in 0.05 increments.

Measure the shims that are in there to start with and note these down.

Drawing the engine help :-)

Once you've measured all your shims and clearances you can work out how many you need to change.. ie if you have a 3.00 shim in there and you gap is too small, putting a smaller shim in will increase your gap.. 2.95 is the next size down which will give you a 0.05mm larger clearance.

Best thing to do first is measure all the shims and the clearances.. then see which ones need changing and what shims are already in there.

I did this with my ZXR and needed 10 shims! :/

However, after seeing the sizes of the 10 I was replacin I realised I could put 5 of them back in different places so only had to order 5 new ones :-)

[Morespeedvicar]

Cool, thanks for the reply. I'm off to honda dealer tomorow (if i get chance) to get two new ones. Hopfully they have them on the shelf or exchange them, or rick o maybe getting an email!! lol.

Cheers
Ian

[mart]

i have a excel calculator if you want it. just add in the gap old shim sizes and it will tell you the new shim size and it has all the shim sizes listed so you just pick the closest

[Deviant400]

that'll be handy , i just used the A-B+C= route as stated in the haynes book of.....just simply remove the!!!!!

[mart]

that'll be handy , i just used the A-B+C= route as stated in the haynes book of.....just simply remove the!!!!!

same thing just a little simpler

[Morespeedvicar]

Hi,
thanks for the replies and offer of program, but i got the shims now (ones still in it honda bag!!). Hopfully get them put in if the snow has cleared tomorow.
Cheers
Ian