No silly beginner questions here, just answers.
This is how:
I said I was going to do this 15 years ago, and using the leftover junk I have in my parts bins once again I was able to whip something up!
This particular installation is a 2003 Yamaha R6 shock and linkage. The Magnum swingarm was cut and lengthened about 6". The top shock mount is cut from a leftover tweaked CR500 frame I had laying around from another project. The lower linkage is welded up to the frame and wrapped around the bottom rear engine bolt (the only SOLID place I could find.)
Anyways, sitting on it and bouncing it feels really good, you can definitely feel the difference of the progressive action over the crappy bouncy factory Magnum shocks.
I am hoping this setup will allow me to get a knee down a whole lot easier in a turn. The rear used to bounce like a basketball and chatter along the pavement when I tried to lean it over and I hit a little bump, VERY SCARY!
1. A little more weight added
2. Longer chains / might need a chain guide or a roller
3. Hard to install/fabricate, not a direct bolt-on and definitely not a beginner's project
4. Not cheap if you have it done professionally or choose to install NEW parts! (The retail cost for the shock alone is about $750, about $1000 total with all the linkage)
5. Won't increase the resale value
5. Longer wheelbase, harder to wheelie (boo-hoo!) Might also make the low speed turn-in action a littler slower.
6. Someone is going to say it sucks or its going to break, blah blah blah
7. Probably won't get me laid (not enough hot moped chicks out there!)
1. No more rubber grommets wearing out (squashing) every 2 months (I hate those damn things)
2. Progressive action
3. Cheap if you have stuff laying around, or if you like to Ebay, or steal one off a parked bike (don't do it, i'll kick your ass if its MY bike!)
4. Longer swing arm travel
5. Longer wheelbase, makes the bike look BIGGER! (I won't look as dorky @ 6'3" and 250lbs riding it) This also should make the bike more stable at higher speeds.
6. Standard aftermarket R6 linkage parts make rear end height easily adjustable
7. The shock stiffness is adjustable
8. Wider tires and even wider wheels can be fitted
9. Proving people wrong when they said it couldn't be done
10. Unique project/one-of-a-kind
11. ITS TOTALLY FUCKING COOL!!!!
Other comments and impressions:
The factory swingarm was cut and smaller diameter THICKER WALL pipe was PRESSED several inches into the cut halves then welded together. This should make the swingarm STRONGER than it ever was before as its double thick, but as a compromise to more added weight. The swingarm does still seem a little long to me, and I worry a little about it flexing or bending. I will watch it and keep measurements and if I see anything changing after everything settles it may be further reinforced.
Right now the rear end ride height is set to keep the front fork rake at 22