Greg:
Mounting the swingarm on an HD transmits the belt loads through the swingarm directly to the transmission case, NOT through the rubber.
Sure it does. The engine and transmission don't go down the road by themselves. How do they drag the rider, the frame and everything else along? Through the rubber mounts. Twist the throttle, the rear wheel pushes forward on the transmission and engine--that are pushing forward on the rubber mounts, that are bolted into the frame. Load up the rear of the bike, with the shocks mounted at an angle and pushing rearward. Where does that load go? Through the swingarm, to the transmission and through the rubber mounts into the frame.
Yes I'm very well aware of the fact the chassis is rubber mounted onto the drive train on a typical HD. But the fact remains AMF developed that rubber noun system in the late 70's and it works.
Not very well. The rear wheel wobbled around like there was a hinge in the middle of the frame because--well--there WAS a big rubber hinge in the middle of the frame.
They didn't fix the problems with their rubber mounting until 2009? 2010? They finally added a heim joint to keep the transmission from shifting around and allowing the swingarm to wiggle in the frame.
At least on the EH design, the weight of the rider, passenger and luggage have zero effect on the rubber mounting system. Not at all the case on a Harley.
And again: the rubber mounting system is only used on a few models. Until the counterbalanced Twin-Cam engine came out, those other models were all rigid mount.
EH, following the advice of Gates belt, had a design belt tension. Fact is, and everyone recommends it, dont go that tight, it destroys the mounts.
That's a calculation error, not a cause of rubber mount failure. Same exact problem on Harleys and Buells, except it's the output bearing on the transmission that suffers. I think that's been a common problem on every belt-driven bike ever. I know it's an arguing point on the Buell forums.
I bought 0307 several years ago & was afraid to ride it for fear of crashing the transmission as happened to my friend at about the same mileage, 7k. Word was my bike came from a former employee of EH and was part of a severance package. I'm not sure that's true but I did note the words DEMO were hand written behind the faux tin cover on the outer primary over the alternator stator. It supposedly had synthetic oil in it, had the factory oil cooler too, yet shavings galore.
Hmm...don't know what to say. No such evidence on my bike. Maybe it was one of the burnout bikes?
Few successful products have no development time. I'm like everyone else here, I like the bike, impressed with the style, and really wished they'd survived. But they did not.
My point was clear, it (EH) was a start up company & they had little to draw from. Had money kept flowing they still had issues, big ones.
I still disagree. Harley--despite all of their financial might--has introduced some real mechanical turds. For almost the entire run of the Evo Sportster engine, they had an under engineered oil pump drive gear. It took Erik Buell to fix it in 2000.
Ditto for the primary chain tensioners. That engine got its last redesign in 1991 (becoming a 5-speed). Erik Buell had to finally come up with his own primary chain slipper in 2001 to fix the failures they were getting on their production bikes.
The early Twin Cam motors were another example. Look up the drive failures they had on the cam system.
Ahh...then there's the oil puking Sportsters. It's like they
designed it to puke. The breathers are holes drilled into the side of the head casting. Where do they go? Into the cylinder head. Seems like a reasonable place to tap for engine breathing, right? Where do you suppose they drilled those holes? At the BOTTOM of the well where the intake valve springs are.
If you study the design of the Sportster rocker boxes, you quickly see that any oil that gets up there to lubricate the rockers and valve stems, will end up draining down into that well. It has nowhere else to go! It CAN'T get back to the crankcase! The ONLY place for that oil to go is right out the breather and all over the side of the motorcycle.
Those mental giants used that breathing system until Erik Buell...again...put a breather port in the TOP of the valve covers--somwhere the oil wouldn't pool and run out on the side of the bike.