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#21
11-17-2016, 12:22 PM
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Well 13.6 is pretty jolly high for a 300, perhaps it is finding its sweetspot.
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) 
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#22
11-24-2016, 04:48 PM
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I have seen head swirl porting done on 3 different snowmobile engines. The CC volume & squish gap was the same before and after using two different sets of heads for each engine. On the dyno one engine gained 8HP and the other two gained Nothing. The swirl porting was done on a 600cc, a 700cc & a 800cc Polaris race engines. The 700 twin gained HP the two triples (600cc & 800cc) gained nothing. IMO Get you CR & MSV (Maximum Squish Velocity) set and be done with it.
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#23
12-23-2016, 04:10 PM
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only problem I've seen with the polaris ones is the grooves don't look deep enough, and the "professionally" grooved ones are done a mill, which in my eyes is less accurate than filing directly at the plug gap.
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450
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#24
04-17-2017, 07:07 AM
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Been a few months now, main case seal decided to blow so it's time for a full rebuild... Yay!
Anyway, head looks perfect and the bike has been through utter hell in the last few enduros!
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450
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