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What is the measurement between the frame members where the swingarm attaches? I'm trying to decide whether to keep a '85 ZX900 swingarm for future use on a 500; I have a 17x4.5 rear wheel for the ZX swinger that will take a 160 tire easily.
 
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Just pulled the zx900 swingarm off the junker, I'd have to mill off most of the swinger to fit so that's out.
 

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So what's result? Does the zx900 swingarm fit the EX500's?
 

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looking in the wrong direction.. i personally am looking in the smaller cc scale of swnger/fork swaps..(500cc below. for ex. aprillia rs125 250,500.. cagiva mitto 125,250.. suzuki models including gs500 is inverted.. or even buell's would work better.. would be sick..honda cbr250, everyone's automatically jumping to the 600cc bikes for swap parts. its not weight saved, nor worth the hasle of fitment.. when there is great 37mm+ inverted forks all over the lower cc markets.. lots more clip-on options,levers-bar ends.. tire,wheel,options..

same goes for the swingarm set-ups. the smaller 500cc bikes have some great looking swingarms that will have closer fitting chasis sizes/widths/bolt size(everything about it will be better) and if anything you will need a shim or two.. oh... with the suspension in the rear.. it will be far superior and 3 way adjustable no matter which way you go if you go to the europe,spain,italian market of bikes..

best of luck.. and dont forget if you change your frame in anyway think (gussets)and or (crossmember under tank and near swing arm) frame strength will help with any flex due to hard breaking with the new forks and all that 120-170 tire stoping power.. i cant wait to unveil mine.

props to flipped his concept is nice but someone needs to do it right!!!no short cuts!!!!
 

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ninja said a mouthfull

"best of luck.. and don't forget if you change your frame in anyway think (gussets)and or (crossmember under tank and near swing arm) frame strength will help with any flex due to hard breaking with the new forks and all that 120-170 tire stoping power.. i cant wait to unveil mine."

The rest of the frame on the EX it too weak to support the traction that the stock tire gives. Today's tire are so much sticker than the iron ones of the 80s when this bike was designed. Even the tires I raced on, 140s would twist it like cooked spaghetti.
So any swap of any parts to get larger tires better be primarily for looks because it comes with a price. I not sure if gusseting can fix it , but it can't hurt. Do a lot. My race class prohibitted any so I know the stock frame is very weak. The triple trees for the fork are the worst part. but then theres that steering neck and......


FOG
 

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+1 for cosmetics only...

maybe with enough gusseting...

Good luck, at least it may look better.
but then again the 500 isn't much to look at :p
 

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Kawi lists the dimensions for the swingarm spindles, and that will give you the width between the frame rails, as well as the diameter of the swingarm pivot bolt and the diameter of the swingarm bearings.

Go to http://fiche.ronayers.com/Index.cfm

There, you can look up the swingarm spindle. When you click on the part number, it will bring up its description, which includes dimensions. The EX500 spindle is the same for all years. It is 220mm long and 14.1mm inside diameter, which means the pivot bolt is 14mm diameter. It is 22mm outside diameter, which also gives you the inside diameter of the swingarm pivot bearings.

Anyone know how much of a swap the gen2 swingarm is to a gen1 bike? I know the pivot is the same, but how about the rear axle and spacers? I know the brake torque rod mount will have to be fabbed.
 
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