Don't be shocked Mike, OEM cylinders make awesome power and are the most reliable to date. When porting, matched setups even as a Duner, MX, TT or Woods....68MM x 72MM OEM's can hit 57HP/40TrQ. In some cases considerably higher than 310's or 292's. Check out the BDT 68MM x 72MM link and Dyno Graph for a MX engine...better than 99% of 310's...
thats a oem ripper aztec. awesome.
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Were these #'s at wheel or engine......? See they give out around 8k. Pretty good for stock. Imagine hoping my ported goes to 10-11k, upwards of 55-60. HI RPM Port, head configuration on 108 cam2. Check out Richards' Engine Development. Maines hidden gem, IMO.
Did my 99 583cc ski-doo. Torque monster, 80 trq-112hp at 7800 +/- tach being off. Sock 670's had 80 tq, so I was happy.
Like to see more dyno runs.
86 253cc, 40pwk, CT OOF pipe.
99 583 Formula Z
74 340 TnT- in progress/restoration
Owner, hellabrokeNH- coming soon.
Awesome number. Makes me want an OEM cylinder to try out.