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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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Squish-did I do this correctly?
I have done many 2T top ends in the past (including one GG) but never worried about the Squish.
2010 300. No modifications to cylinder or head. I used the RB Designs instructions on measuring squish. Again, this was the first time for me. At first I had all three base gaskets that were included in the top end kit in place, the squish was nearly 3.0 mm. Eventually I ended up having just one (the medium thickness gasket that I believe to be 0.5mm +-) base gasket in place with a squish approximately 1.8-2.1 mm. Does this all sound to be in the ballpark/reasonable? Thanks J
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2015 KTM 450 XCW 2014 350 XCF Wife's 2009 200 ec. Loving it 2007 Beta Rev 3 270 2007 KTM 200 XC Wife's Public Lands belong to the Public Last edited by husley; 10-25-2013 at 04:51 PM. |
#2
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I believe the 3 gasket thicknesses are .15, .3 & .5mm. Theoretically if you started with one of each and subtracted the 2 small ones (.45) you would have dropped that amount. Just go through RB's direction carefully as it is pretty straight forward.
If your 'nearly 3mm' (BTW "nearly" isn't real accurate) was in fact 2.55 then your math would add up pretty close.
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Fred Overstreet 2010 EC250 SixDays 2004 GasGas EC300 -Sold to a good home 2006 GasGas EC250-Sold to a good home 2006 GasGas TXT 280 Pro |
#3
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I am also interested in this. I believe that Playing with base gaskets has a trade off effect on the exhaust port height. I have also done a few top ends without paying attention to the squish (because I only had one base gasket anyway!) but will be doing my top end again in a few months and have pile of gaskets now so want to do it better
I know the correct way is machining the head to get correct squish and correct compression etc but for those of us without access to reputable machine shops what is the second-best way to do it? What are the trade offs of exhaust port level and squish. Wich should hold preference?
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2003 txt250 Pro 2013 Ossa 280i |
#4
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Not only does it trade off your power delivery due to the port timing, the compression ratios also work in the same way.
Remove base gaskets = higher compression = ports timed for bottom end. High comp boosts the bottom end too and kills over rev. You end up with a bike thats a beast off the bottom but signs off early. Good for some, but a waste of an engine. Going the other way you end up with low comp and a massive inefficient squish clearance which makes it a pain to tune. Ideally you want both to be in a set range, and then use port and powervalve timing to determine the curve. Squish should be around 1-1.3mm ideally. 2.5mm is considered large enough to drive a bus through. 3mm is obsurd. |
#5
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Quote:
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Fred Overstreet 2010 EC250 SixDays 2004 GasGas EC300 -Sold to a good home 2006 GasGas EC250-Sold to a good home 2006 GasGas TXT 280 Pro |
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