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21st October 2008
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Flat Track Racer
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Join Date: Nov 2004
Posts: 226
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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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21st October 2008
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Senior Chief Know It All
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Join Date: Dec 2004
Location: Brewster NY
Posts: 810 Sportster/Buell Model: XLH 883/1250 Sportster/Buell Year: 2003
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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.
__________________
03 Vivid Black 883/1250, with 04 1200r/XB heads, Andrews N4 cams, Hurricane push rods.040 shorter than stock. Dyna 2000i ignition, Screaming Eagle ignition coil and wires. V&H Straight Shots, Generic tear drop with 3in wide K&N filter, 48 slow, 175 main, NOKH needle shimmed .043. Progressive front springs, 412 rear shocks. ♠ 79.5 HP, 77.96 TQ ♠ ~Kevin~
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21st October 2008
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Senior Master Custom Bike Builder
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Join Date: Sep 2005
Posts: 18,157
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Both are pretty damn different...
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21st October 2008
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Senior Chief Know It All 2nd Class
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Join Date: Oct 2007
Location: Terra Firma
Posts: 1,450 Sportster/Buell Model: XLH Sportster/Buell Year: 1979
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Quote:
Originally Posted by Kev M
Both are pretty damn different...
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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; |
21st October 2008
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Senior Master Custom Bike Builder
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Join Date: Sep 2005
Posts: 18,157
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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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22nd October 2008
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Flat Track Racer
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Join Date: Nov 2004
Posts: 226
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Thanks guys, I figured as much........Knew I get the skinny here.
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22nd October 2008
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Senior Master Custom Bike Builder
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Join Date: Aug 2006
Posts: 8,654 Sportster/Buell Model: XL1200 R Sportster/Buell Year: 2006
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Not only are the engine mounts different, but the swing arm mounts are very different also.
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Ricor test rider for IAS Shocks, Intiminators and Vibranators. Works Dual Rate fork springs, fork brace, Avon Venom X tires, loosen drive belt, and set frame rails level to floor. Read the "7 Pages of Suspension" thread in the Suspension Sticky Index to learn how to fix your suspension.
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