Chain drive XS11

[pggg]

This thing is a mixture of GPX and ZXR Kawasaki parts combined with XS11 parts. With this 35 T rear sprocket, the bike cruises nicely at 3200 revs at 100kph.(62mph) 4000 revs in 5th is 124kph(77mph) 4000 revs in 4th is the same speed as 4000 revs previously in 5th. A whole new gear has appeared. I have a 40T sprocket - haven't tried it yet, but it'll be a wheelie sprocket for sure. Especially with the smaller 12T front sprocket as well. Haven't wound this thing out yet, but can feel some extra scary horses lurking.

[CruisingRam]

Hey, great mod! I am very impressed!

How about pics of whole bike?

[GNEPIG]

.. very cool, how many teeth is the front sprocket now?
looking forward to a top end report also before you change it around again... how fast will she go?!

[pggg]

GNE, I've been too chicken to thrash this setup yet. 5000 in 5th and the speedo was rocketing up there and not even in the powerband. Doubt if I'd bother with the 40T. Too low most likely. O.K. for drags tho. 13 & 35 give about 19mph per 1000 rev. Doubt if any taller would be any good. 12 & 35 would be a good combo probably.

[GNEPIG]

.. its still very cool!
a dude who could come up with such a setup and ride it to must have a penis in XS of 11 inches

[John]

So Patrick

That's what became of that dog's breakfast. Nice work.

[81xsproject]

looks great, love the tire, now what?

[skids]

It does look great. Does the chain contact the trailing arm's pivot pipe (or whatever the damn thing is called)?

[Shuriken]

Fascinating.

I too would like to see a pic of the whole bike so as see how that tire and a chain drive looks as a whole.

How well does that rear disc improve rear braking?

Ben

[TopCatGr58]

Hey Pggg,

That's absolutely awesome! Curious about the swingarm, is that the cut in half and welded 2 right haves, or did you find a different one that would fit well?! IF it is the XS11's modified swingarm, where did you get the axle slots? I know where I can get the axle adjusting rings/bolts, Mike'sXS has them new!

I'm almost up to speed with my lathe, and so machining a "bloody" large hunk of plate to act as a spacer may be the way I go, so that I can keep the XS11 stock rear wheel! But I'm no where near what you've gotten done!!

Like you said, I think you've got possibly 20 more horses lurking since you aren't having to drive the middle gear, power conversion to driveshaft, and then final drive conversion. It'll probably turn wheelies much easier NOW even with your higher ratio smaller front sprocket and 35T rear......glad to see our calculations were about right!!
T.C.

[pggg]

81' now what? Chainguard, oil everywhere already. Give me a clean quiet shaftdrive anyday. Brakes, dunno how they work, have been too lazy to pump brakefluid in for now.(already ran into a plastic skip bin - doh no back brake) Not sure if the ZXR750 has a swinging bearing on the caliper bracket? This one is a cut-down XS11 bracket. Swings with axle loose. Locks tight with the axle and a CB350 pivot-pipe/torsion bar to swingarm. All precise fits. I'm picking the rearward force will pull the swingarm down under braking? Maybe skipping and chattering? The ZXR's pivot-pipe looks like it connects to the frame. Easy to go the ZXR way if no good. Disc is GPX750. hose is front XS11. Wheels a 95-97 ZX-6R. 160 60 17. TC got some swingarm pics. Sprocket setup might be tricky. Cush drive rears have bearings dead in line with the sprocket. Maybe the solid setup of a great chunk of alloy would unbalance the wheel too much? Who knows. Probably not as the l/h rear XS11 bevels weigh a ton. Although that's held by swingarm. Inside rear sprocket to wheel centreline measurement from an XS650 would be interesting.

[pggg]

TC, the axle sliders are machined from 10mm angle iron. Cost $40 each! Possibly cheaper to scavange an old steel swingarm and cut the slider parts off. Anyways, they're locked to the axle with spacers then tacked to the 'split' swingarm on a flat level surface. Swingarm pivot centres to axle centres EXACT on both sides. The whole thing's gotta be PRECISE. No rocking. 1mm of error is 1mm too much. The l/h arm was kinked with a hacksaw slit bent inwards then welded solid. Lucky a workmate is a good welder (unlike me) so I just hovered around trying not to make too many annoying remarks as he did the welding. Took us about an hour. No rushing. L/h shockmount is offset out 18mm from original(for chain clearance) and 2 appropriate sized bushes slid on the upper mount.

[pggg]

Well fellas, I've done a few hundred miles on this thing and the news is all good. The rear brake setup works great. The whole bike is noticably lighter. The handling is good. Gear changes are smoother and quieter. Engine runs very smoothly with chain drive. The new gear ratios are brilliant. Tons of power all thru the rev range in all gears. Cruising speeds are relaxed and effortless. Went for a short speed run this morning in a tailwind and hit 220kph at around 7000 revs in what seemed like seconds - with a big chunk of power still to go! Felt planted and stable too. Haven't really checked, but fuel economy should be better as well. Downside - chains and sprockets are messy and maintenance intensive compared to shaftdrive. Will force myself to live with it. It's a tough life.

[chevy45412001]

outstanding!

now. can you duplicate the mid gear conversion? Or give the specifics here ,so we can all have fat tires and oiliy chains?

[pggg]

Chev, any questions answered. ZX9R, ZX7RR will fit if you want 180's and 190's. ZX6R rim runs 160 and 170. Later ZX6R's run 180's also. Probably equivalent Suzukis Hondas and yamaha wheels would fit too.