Forged is what you want. That’s what all performance engines have. It’s the strongest rods / pistons / pins. It means it can take a licking. Doesn’t mean that the rings or cylinder actually wear any longer. Just that you won’t throw a rod or pin by ragging on it.I read a post where for the first time a reference to the engine changes stated that the new 686 engine had 'forged internals' . Can anyone shed any light on this subject. If so this would seem to give a bulletproof design when coupled with SOHC layout. Educate me.
So mentions starting in 2019, the 686cc engine piston is now forged whereas the previous generation 686cc engine has a cast piston.New 700-class engine
For 2019, Yamaha’s engineers have boosted the performance of the big bore Grizzly EPS even further, with more useable power. Grizzly now runs a new liquid cooled 686cc engine with improved engine response and lower vibration, noise and fuel consumption compared to the current 708cc engine.
In order to achieve this, a number of internal engine changes have been made including revised bore and stroke dimensions, a low friction plated cylinder – was cast iron - and the cast piston is now a forged item. A new air intake improves engine output especially in the key mid-range area while redesigned engine mounts make for even smoother running.
I would side on stating that it would be an assumption that anything other than the piston was forged. Having all of those internals changed to forged would be a marketing department's wet dream and I can't imagine it would be left out of a press release.Thank you. If the piston and cylinder liner has been upgraded one would expect that the rod/crank would be upgraded to forged components as well. Just wanted to know so I don't ignorantly repeat incorrect info. Thanks.
Totally false.The 708 is a dual overhead cam design. The 686 is not. The SOHC produces more low end torque, but the DOHC produces more top end horsepower. The DOHC will win in a drag race!