2018 XC300 Head Squish
Hi All,
Just a report on some motor work.Have been watching the head mod threads & decided to jump in while putting in a new piston & rings.
2018 XC300 112Hrs.
Head squish 2.4mm.
Had 1mm taken off & a little dome volume remove to keep compression down.
Wossner Piston(9gm lighter than stock).
Polished exhaust ports & matched to exhaust spigot.
New power valve bearings & clean/polish.
Power Valve 2 turns out.
Prework jetting-175main,NEDW#2,40 pilot,A/S 2.5out
Post work jetting-175main,NEDW#3,40 pilot,A/S 2 out
Result Pros-Pulls a gear higher(ie. switchback uphill corners don't need to change down),runs clean & bright,more torque,exhaust doesn't lubricate the swingarm.
Well,not yet.Did repack it so will see after a few more hours.
Revs its tits off at top end.
Can loft the front in any gear at any throttle position. Friken scary at times but so much fun.
Much easier to jet,responds to small changes.
Head Mod cost NZD$95!!! That is a Quarter Pounder Meal is other countries.
Result Cons-Should have taken 1.2mm off the squish but was being conservative.
Throttle Control is VERY important now.
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