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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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Cylinder head questions
I have seen a S3 cylinder head set for the 2018 EC 300.
Am I wrong or should that fit also my 2019 EC 300? As far as I know cylinder, head should be the same. No clue about the ignition systems and if they are relevant. There are three inserts, silver, black and red, no clue which one does what, but the dealer's description says: standard, standard+, and standard++. Anyone here who can widen my horizon please? |
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why would you buy the S3 head with inserts if you still need to put them on the lathe to decrease squish? you can just aswell put the orginal head on the lathe, or even cheaper, just put a smaller base gasket on and be done.
and IF you should screw up the original head, THEN you can still find another head aftermarket or original...right? we all know someone who knows someone with a lathe, right? if you're worries about compression going uptoo much with the thinner base gasket, measure volume with oil and piston in TDC and verify with other measurements from fellow members. just my 2 cents guys... |
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Thank you guys, my questions have been perfectly answered.
Last edited by Doc Brown; 04-24-2020 at 02:38 PM. |
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Hey Doc.
Back on my 2010 model, I used the black insert with a 0.5mm base gasket.. It gave me 1.25mm squish and waaaay too much compression. Had the insert cut to give more volume and she was a very nice engine after that.. All up cost a lot more than just having the stock head worked though. |
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For me, at elevation.. the high comp insert and base gasket adjustment got my squish / compression ratio bang on. More expensive, but zero turnaround time. I feel like the S3 head also translated to some extra cooling.
__________________
2021 Beta 300RR 2014 Gasgas XC300R 2019 850 Pro RMK |
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Thank you guys!
@Jacobi That's strange, the compression should only be raised but not be too high. Is it possible that S3 sent you a wrong insert? dANbOT's worked obviously well... |
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I was on a 250 too.. they run higher comp than the 300's out of the box to start with. It's the same as trying to close the squish up with the stock head simply by removing base gaskets alone.. You push the CR through the roof.
Higher octane fuels, and altitude both allow greater compression ratios too. S3 head insert combustion chambers are some volume as stock. |
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For GP300 -18, I switched from stock head to S3 and high comp insert (the medium one that came with the head).
Stock head had wayyy too much compression. Pinged every time I closed the throttle. S3 head made it a lot smoother to ride with nice fuel economy. |
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