I have an 85 xr600 that i split the cases on to replace a few gears (go figure) and I thought once I had it apart i would go through the top end. I got all excited about a 628 kit, but it needs to last me a couple more years and I hear mixed thoughts on reliability. So I have decided upon a 98mm wisco w/11:1 comp and a stage 1 hotcam to compliment the increased compression. I l have an unplugged stock exhaust and am wondering if any of you have experience on how much I will need to change the stock jetting or mess with the carb slide-opening-timing. Ideally I would have liked a 10:1 compression, but wiseco seems to be the best for the $$$. So my next question is.... Does anyone have any thoughts on using two cylinder base gaskets to drop the compression ratio? I omitted the base gasket on my old xl500r to increase the compression, so the reverse should also hold true, but I worry about two gaskets squishing to much over time. My gut tells me it's a bad idea, but maybe.....? I know that by using a cam with a longer exhaust duration helps keep cylinder pressure down as opposed to the stock cam, but I still wonder if 11:1 is too high. I ride a lot in 90deg weather with only 91ron available. Trying to retard the cam timing makes me feel queasey and would require buying all the necessary tools. Am I just overthinking all of this as usual. My eyes hurt form trying to find related posts. Thanks.