Originally Posted by DEVILSorchard
There's nothing wrong with rubber mounting an engine as long as it's done right. Using a rubber spacer between contact points and a bolt straight through sandwiching the rubber is not the right way. You will have problems with the bolts tension tightening and loosing with the cycling vibrations and possibly fatigue cracking your hardware and mounts or you cult have problems keeping them torqued. For these engines I can't see this being a serious issue if regular torqueing of the hardware is kept up on.
I'm not sure I agree with the comment that it will add more violent vibrations to an engine that you just won't feel. I can see where your going with this. The engine will vibrate and rock in the mounts further than a solid mount but would the rubber not dampen the impact rather than things being solid with less motion but no damping?
If your looking to rubber mount an engine to last the best way is to use rubber bushing where the bolt can go through and torque tight against a solid mount and have the rubber isolating that entire assembly. Like a transmission mount on a car or have a look at the 2003 and earlier solid mount harley engines vs the 2004 up. Almost the exact same engine other than provisions for rubber mounts.
This has been gone over at least a trillion times in here and the proven mount type for these is solid. We see people in here all the time complaining about vibrations and Every time it was due to poor mounting with rubber where it doesn't belong.
Several other members in here including myself have Harleys and Buells as well as other brand large V twin cruisers and there's a huge difference between an 800 pound Harley and a 50 pound bicycle, but the reason Harley switched over to rubber isolation mounts was when they began making counter balanced engines, All the EVO engines and older were solid mounted except for a few of the Dyna type frames.
You can mount these engines in Your bike however you wish, we will be there to help when you crack your frame and we'll also answer all your questions on how to get rid of these aweful vibrations. Take it from those of us who know... Solid is the way to go on these if you want a smooth ride and to keep the same frame for more than a few months. Like I said, there are just tons of posts on how to properly mount an engine, and it's no secret that rubber has no place on these mounts. The more solid and rigid these are mounted, the less vibes you'll feel at the bars and seat, and the longer your frame will last.
There are Very, and I mean Very few people in here that can come up with a successful isolation mount setup with these so to keep it simple and to help the guys who have never worked on a bicycle before let alone install an engine on one, the general concensus is to help the new guy who needs all the help he can just to get the kit installed and not confuse them with the "fab up this, weld here, cut here' etc, etc, etc...
Now if you can come up with a properly functioning isolation mount setup that's dead smooth and doesn't crack the frame in a month, please feel free to do a write up on it, but when helping the new guy out, we can't assume he has 40+ years experience building these, and anyway, it's been proven time and time again that mounting everything nice and rigid is very dependable and smooth.