quick question
Intermediate
Joined: Aug 2016
Posts: 31
Likes: 2
From: Saskatchwan
Are you talking about an old sportster ?
I had a sportster back in 89 and it literally shook the eyeballs in the sockets. I recently bought a new to me 2005 883 C and it's a different beast all together. The rubber mounted engine has fixed the problem. The only thing that needed upgrading was the suspension.
I had a sportster back in 89 and it literally shook the eyeballs in the sockets. I recently bought a new to me 2005 883 C and it's a different beast all together. The rubber mounted engine has fixed the problem. The only thing that needed upgrading was the suspension.
Stellar HDF Member
Joined: Nov 2015
Posts: 2,726
Likes: 716
From: Pennsyleffinvania
There is no guessing involved. With the 45degree v-twin engine, the firing sequence of the individual cylinders results in a constant battle between the two. Remember also that the original Harley design was conceived over 100 yrs ago by guys that ran a bicycle shop. Since then, HD has had a death grip on the design not out of any engineering basis, but solely because of fad or fashion. It is nuts.
Tourer
Joined: May 2015
Posts: 359
Likes: 56
From: Dallas
How were people guessing at this? Really the only motors that dont vibrate are boxer engines because they cancel out (by design). Even that 4 banger in your focus vibrates. Cars just have hella good dampers. Same concept as the rubber mount design (which is in new sporsters).
Edit: I guess theoretically the 8 piston design of airplanes where they are all opposing each other would also cancel out as jaytee stated. I just have no real working knowledge of airplane motors.
Edit: I guess theoretically the 8 piston design of airplanes where they are all opposing each other would also cancel out as jaytee stated. I just have no real working knowledge of airplane motors.
Last edited by sawka; Aug 28, 2016 at 05:06 PM.
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you may dampen it, but it's still vibrating.
here's a quick question, why do tires roll? i've looked on the internet, but can't find a reason why...
Thread Starter
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Tourer
Joined: Aug 2008
Posts: 345
Likes: 17
From: SoCal
I guess I didn't word my question right. I've been riding sportsters for a while now. I upgraded to a '06 1200 L a few years ago and I'll admit the rubber mounting is a big improvement. I won't go newer than an '06 'cause I can do my own work on a carbed bike. But I've had more than a couple people ask my why I don't go bigger for the smoother ride. I've been riding for over 50 years and too old and set in my ways to want to change now, I'm a sporty fan and will remain so. But if the ultras and soft tails etc. have the same 45 degree engine why are they so much smoother? Just curious thats all.