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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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Head Mod (squish)
I drive a EC 300 '09 Model and I'm looking for bit more power at the bottom and a better throttle response since I mostly ride very tight and tricky stuff. I measured squish and my results are 2mm. The base gaskets are 1 grey and 2 greens = 1,1mm. Compression on a warm engine was 11,5 bar, 166psi. I know how to use a lathe so i was thinking to just take of 0,2mm off the head to drop the combustion chamber of the head down and therefor change squish to 1,8mm for starts and see if I like the results. The fuel we run here has at least 95 Octane so that should be ok. Will this mod be a risk for the engine or should I just go for it?
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#2
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As long as you get cut the head level you'll be fine.
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#3
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should be fine. might wanna check and see if piston lines up with exhaust port at bdc. you could just lose a base gasket or 2, if that still keeps piston in line with exhaust port. if not, cutting head would be the way to go. optimal is 1.2 - 1.6 depending on octane, port and ignition timing.... 1.6mm is a good number to shoot for. and you can still move it around slightly with base gaskets if need be.
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com |
#4
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Being a cheapskate I did mine by dropping the base gasket thickness, improved the bottom end but at the expense of top end.
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Gas Gas EC 300 '06 BMW F650 |
#5
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I found exactly the same thing on my 250. I removed a .5 and a .3 gaskets from stock, leaving only a .1. The bottom end improved but at the noticable reduction in over-rev (top end). Because I rather like top end hit, I re-added a .3.
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Barry 07 EC250 |
#6
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I took off the head today to look if the piston is aligned with the exhaust port at bdc. Looks like the piston is higher than the port. I didn't measure it but i can feel that the piston is higher when I go over the edge with my finger.
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