The engine is only a couple of months old. But I have only been changing things to try and stop the leak I already had, not change the compression ratio or anything like that.

I am still confused - The car came fitted with 3 shims (to get the right lingo), the manual says you should use 3 off #1418, but the guy in the shop says use 1 #1418 + 1 old one (as they only had 1 #1418 in stock). I have checked the HPI website and it only shows this part number as a standard part on the Savage. Could there be a problem in the manual?

Thanks for the replies