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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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  #1  
Old 21st October 2008
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Default rubbermount in a rigid frame

Here the question, can a rubbermount 1200, be used in a rigid EVO 1200 frame? Does anyone know if HD changed the casing and the frame or just the frames for the rubbermounts?
Thanks in advance....
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Old 21st October 2008
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The frame is a little bigger to accommodate the rubber mounting points, At least to my eye viewing Elissa's and mine side by side. Cases are different at least with the trap doors and the primary covers, as for the spacing of motor mounts I am not sure.
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Old 21st October 2008
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Both are pretty damn different...
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Old 21st October 2008
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Quote:
Originally Posted by Kev M View Post
Both are pretty damn different...
Same as "Kev M " except + {10 X10} = 100 % different in both:

a) the frame with all new motor mounts, its dog bone attachments as well as
b) the huge cast-in rings on the front and rear of the crankcases.

It would be easier to fit an Evo engine into a rubbermount frame than "vice versa" but not necessarily by much IMO.

However, I am quite confident that someday, someone, somewhere will do exactly what may seem impracticable just to prove a point.

Cheers;
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Old 21st October 2008
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LOL - I was just walking the line of the fact that they are both the same basic design. 45 degree V twin, 4-camshaft, shared crankpin EVO sportster motor in a dual-cradle frame.

But yeah, what FE said.

The motor casing on the solidmount acts as a stressed member, reinforcing the less bulky frame for a nice rigid chassis. When they rubbermounted the motor they had to increase the frame size/bulk (weight) in order to get back that rigidity (they claim the new frame is stiffer by some large percentage, though it's not clear if that's double-talk for it had to be that much stiffer for the chassis to essentially have the same stability if you know what I mean).

Anyway, they are about as similar in character as two very different bikes can be.
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Old 22nd October 2008
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Thanks guys, I figured as much........Knew I get the skinny here.
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Old 22nd October 2008
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Not only are the engine mounts different, but the swing arm mounts are very different also.
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