One thing I didn't like that you mentioned is "It's inconsistent since I'm not always exactly where I was the previous measurement and sometimes I catch the ring." Not sure how you catch the ring. Now, was the factory wide on mine? Probably not, I changed the crank and pistons so technically the 4 holer from the factory could be too thick now and squish had to be recalculated especially with the crank change. The engine originally had a 4 holer on it, and I dropped to a 3. When I set my 95 engine up I went to just under the middle of the range (1.35mm or 0.053"), true middle is 1.397mm or 0.055". If you can get back to "spec" even if it's at the top end of the spec, you're still in spec. I think the point I was trying to make was that if the center of wrist pin to edge of piston crown is different(shorter) on your WSM pistons from stock there is one tolerance, if the base gasket measures over what it "should" measure there is another over tolerance. None of which your stock engine has done so that small change in base gasket thickness in that application cold make a big difference. If it was running offshore they used their 92 Octane Sleeper kit HERE Scroll down, there is port work, carb work and head work. Remember, this is not a stock engine they're discussing. (Note : This XP won the 90 minute 1200 pro overall at the Havasu Global Offshore Finals) Since then, we have not experienced this problem again. 042" squish clearance must be maintained on all Group K modified top ends. After this experience, we specified for our assembly instructions that a. 008" of base gasket thickness could turn a weakling into rocket. The boat pulled viciously up to 7040 rpm.just like all our other test boats. The next morning we gave the boat a short break-in.then gassed it. 024" (6 hole) base gasket and replaced it with a. At the time, we didn't think this was the problem.but it was the only thing we saw that we could "fix". Besides the indicated compression being just a little low, the only other inconsistency was that the squish clearance seemed to be about. Back at the shop we checked out every possible problem. After a quick test ride, we found this XP to have mediocre acceleration and a 6900 rpm peak (that's 150 rpm short of the norm). After a few unsuccessful attempts to resolve the problem with carb tuning, he came to our shop with the machine. We were concerned because all our other test riders had reported big increases in bottom end as well as peak rpm. After the break-in, the test rider reported a little better top end, along with average bottom end power. We shipped the kit to the owner, who had it assembled at a local shop. Or use the head I have on there now and have it planed and then use what ever gasket will work? 3,4,or 6.Īnd the dreaded option, Swap in my spare brand new cylinders and top end kit to see if its better.īase Gasket Thickness - "Jon's Story" - One of our early test boats was an XP that was to be raced in region one offshore. Use my other slightly pitted head that will drop the results a bit and maybe let me use a 3 or 4 hole (testing with it when I go out again.) Since I'm practically splitting hair's here, I think the polisher did take a bit out of the squish band. I'm testing with 1.7mm solder and measuring the most squished part.Īnother thing. I have a 3, 4, 6 hole gasket available but that makes it just squeaking into the limit of 1.6 in certain places with the 3 hole. It's inconsistent since I'm not always exactly where I was the previous measurement and sometimes I catch the ring. While I'm inside for the moment here are my measurements without any base gasket.
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