On doing a max rpm check on an iS engine, I can only get 5200 indicated max rpm on the efis. I?m thinking the prop pitch may be contributing to this, however on rechecking the pitch measurement also appears correct to the iS angle setting. The fully open position of the throttle stop is being achieved ( visually) and getting 100% on the efis. On pulling throttle back to tick tick over the low rpm is reading 200 rpm below the recommended low limit. Any thoughts please