Compression Problem

So when I bought my fx-1 in october it was totally stock in awesome shape. The ski hadn't been started since late 97 early 98, compression was an even 145. I rode it a couple of times, winterized it and put it up. During the winter I did some mods, I put a new FX-1 Factory pipe kit, Msd Enhancer, a new AGM lighter weight battery, and a prop. I installed everything correctly I'm assuming. So i've ridden it twice so far since those mods, and everything seems great. It started idling a lil bit rougher than it was at first while I was out the 2nd time. I went home and checked the compression because I was nervous, with the same $30.00 gauge i'm now getting and even 135. Why? Would the pipe cause this? I haven't got the pipe completely dialed in yet but the carbs are rejetted per factory pipe instructions and before the rough idle it seemed fine. Still rides and goes what I remember as normal from those few times in october. Anyways any ideas?:confused:
 
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