help on hybrid sprockets & chain confused

[gussy]

Hi everyone I tried wikki and didn't get too far please be patient with the new guy if this info is some where already.

Im needing some advice for the new chain and sprockets
I'm going to be on a 10 day highway ride from canada across the U.S. coast
I have an 89 fzr 400 with the yzf 600 r motor haven't rode yet as the chain is toast
the 400 stuff was kind of vauge???
Do I put yzf front sprocket on the front as it's a yzf 600 motor & fzr 600 rear sprocket as it's now a 600 not a 400 & has the fzr 400 rim?
Then change to 530 fzr chain? what length?

What is on my bike now
4 inch width rear rim from a 90 fzr 400 and stock 89 swing arm
front sprocket says
sunstar #333 and counted (15 teeth)
Rear #jtr846-40 (40 teeth) what's up with that ?
chain unknown but toasted

Can I get a chain kit or have to buy in pieces yzf front & fzr rear?
I have been looking on line
the yzf 600r sizes are
front jtf513 15 tooth
rear jtr859 47 tooth
chain 530 length 108

fzr 600 sizes
front jtf513 15 tooth
rear jtr865 45 teeth
chain 530 length 106

fzr 400 sizes vauge info on line
jtr844 ? couldn't find much
front ? 15 tooth
chain 525 pitch???? is that 525 chain ?
length 104

[yamaha_george]

Hi,
You have to establish what the rear sprocket/ wheel on the bike is.

If the wheel is 600 or the sprocket is from a 600 (not sure about inter-changeabilty of sprockets on rear wheels of 400/600's) then:-
the yzf 600r sizes are
front jtf513 15 tooth
rear jtr859 47 tooth
chain 530 length 108

fzr 600 sizes
front jtf513 15 tooth
rear jtr865 45 teeth
chain 530 length 106
depending on what final drive gearing you want quick take of less top speed or slower take of higher top speed

[gussy]

Hi George
Thanks again!
How can I tell if it is a 400 or 600 rim ? Both rims seem to match and look like the 90 400 fzr in original silver. The front forks are single piston type and the front rim has the smaller rotors than 600 and the rear rim is stamped 4" x 18" with a 140 dunlop.
On my 89 400 fzr with the stock box style swingarm , does the 40 tooth on the back mean more top end speed I.E on the hwy? And the 45 & 47 tooth mean more power off the line? Or is it the other way around .

The front 15 tooth sunstar 333 has a slim build up or ridge on the back is this a spacer for chain alligment ?
The chain was so hard and crusty it was hard to tell but seemed to line up well . Wondering with the yzf motor do I need a special spaced sprocket with the stock fzr swinger or is stock ok?
Also online mentioned 400 chain is 525 pitch and the 600 fzr & yzf chain are 530 is their and issue here regarding buying a new chain ?
cheers gus

[yamaha_george]

Hi George
Thanks again!
How can I tell if it is a 400 or 600 rim ? Both rims seem to match and look like the 90 400 fzr in original silver. The front forks are single piston type and the front rim has the smaller rotors than 600 and the rear rim is stamped 4" x 18" with a 140 dunlop.

I am remembering here so be warned I could be wrong ! 4" * 18" wheels were later model FZR600 early models were 3.5" FZR 400 had 17" wheels (remember my warning on that bit)

On my 89 400 fzr with the stock box style swingarm , does the 40 tooth on the back mean more top end speed I.E on the hwy? And the 45 & 47 tooth mean more power off the line? Or is it the other way around .

easy way to remember this if the front sprocket is doing 10K rpm with say 10 teeth and the rear sprocket has 40 teeth , the rear wheel is doing 2.5K rpm
Now if we change the rear to 50 teeth it is doing 2K RPM so less road traveled in a given time

The front 15 tooth sunstar 333 has a slim build up or ridge on the back is this a spacer for chain alligment ?

No idea never seen a sunstar sprocket in my travels

The chain was so hard and crusty it was hard to tell but seemed to line up well . Wondering with the yzf motor do I need a special spaced sprocket with the stock fzr swinger or is stock ok?
Also online mentioned 400 chain is 525 pitch and the 600 fzr & yzf chain are 530 is their and issue here regarding buying a new chain ?
cheers gus

My honest opinion in your shoes I would put the old chain in a plastic bag , take the bus/train/car down to the local bike store (that services bikes as well !!!) toss bag and chain on the counter and with a grin say "I want one of those"
if they ask what its from , say from a hybrid and if the sales man starts some thing stupid talk to a service man as he will know just by looking, what it is and he will then count how many links and tell the sales person what to give you.

Just as an after thought :- If you wipe the chain it is common to see stampings on the chain links see what they say,
and just to be safe fold the chain in two and count the links for yourself.

That might give us all we need to know

[RoadDogma]

OEM pitch for the FZR400 (1WG) chain is 428. Only the FZR400SP (2TK) was equipped with a 525 pitch. The FZR600 OEM pitch is 530. If it were me I would convert to a 520 chain for your hybrid. Sounds like that is what you have already. JTR846 is a 520 pitch FZR400 rear sprocket.

Front counter sprockets are generally interchangeable between the FZR600 and the YZF600. In 520 pitch the JT FZR400 sprocket is different in that it has the "shoulder" that you observed on both sides where it is only present on one side of the YZF600 sprocket. This may not be true on other makes of sprockets. In your case, you should be able to run either the FZR400 or the FZR/YZF600 520 sprocket in front. (With the caveat discussed below). Rear sprockets do not interchange between either the FZR400, FZR600(3HE), or YZF600(4JH).

Because of the YZF600 motor, your biggest issue will be alignment of the front sprocket with the rear. The counter shaft on the YZF600 is offset an additional 8mm compared to FZR motors. If you have an FZR rear wheel, you will need to address this offset. (I would not be surprised if that is what toasted your chain). Running the JT YZF600 front sprocket with the flat face turned inward will help (about 2mm worth). However you will still need to bring the rear sprocket out at least another 6mm. A custom sprocket for the rear should do the trick. Alternatively, you could swap in a YZF600 swingarm/wheel (popular, but not my preferred option). I would rather run an FZR400RR (3TJ) rear wheel which should solve the alignment issue, but it will be costly when you finally locate and import it. Then you will need to modify your swingarm to fit the wheel. In all honesty, the simplest and most cost effective solution would be a custom sprocket. I would call these guys. http://www.sprocketspecialists.com/.

[gussy]

Thanks very much guys for the input .
It would suck to buy new gears and chain just to ruin it.
Cheers gus

[gussy]

Did I read some where about a flipped over ninja 636 front sprocket for better chain aligment? I'll check in with the sprocket shop you mentioned .Is a custom rear sprocket expensive ? is there a way to space a stock rear sprocket 6mm to get the aligment?

[RoadDogma]

The Ninja sprocket will accomplish the opposite of what you need. It will move the front sprocket out an additional 7mm or so. People go this route to align YZF600 rear wheels with the FZR motor. Sprocket Specialists have reasonable pricing, and are known for their custom work. I have only priced their stock pieces, but I would expect a custom job to run $100-$200, depending on the options. You could probably get a spacer machined and use longer mounting studs, but then you may not have enough clearance in the arm for the longer studs. I doubt this route would save you any money.

[gussy]

It's looking like closer to 2oo for the rear sprocket plus chain ,plus sprockets ,plush the 18 inch read needs replacing----
I suddenly found my self searching swingarm and wheel swaps ummmmmmmmmmmm weighing out the pros & cons

[RoadDogma]

I would assume you will be buying a new tire if you do a wheel swap as well. You would likely spend $200+ for a 3TJ wheel. A YZF600 swinger/wheel combo could be had for about the same. However you would need to cut the swingarm, and it will be longer and heavier.

[gussy]

so it looks like i'm going to machine the old sprocket down , use it as a spacer to get the 6mm at the back and flip the front sprocket to get the close to 2mm in the

front to make the 8 mm front countershaft off set.

I could not find a 520 kit for the fzr 400 on ebay or even a listing for the chain only for the fzr .
will any 520 chain work ?

[yamaha_george]

I could not find a 520 kit for the fzr 400 on ebay or even a listing for the chain only for the fzr .
will any 520 chain work ?

Gussey, the chain could not care less what machine it is on (I used 520 chain on a peanut conveyor belt when i raced so i got it on expenses :-} ), what you need to know is how many links you want, last time I ordered a "conversion" chain I found one at 120 links and cut it down to suit with an angle grinder.

[gussy]

Thanks George
I'm still thinking of the Yzf swinger swap , f or now I think I'm just going get it up and running
And see where I'm at before going and spending money on the big mods .whenever I add the nickels and dimes this thing
Is getting expensive .

[RoadDogma]

Turning the old sprocket into a spacer sounds workable. Just make sure that you have enough clearance in the swingarm to accommodate any extra length of the studs for the sprocket.

[yamaha_george]

Turning the old sprocket into a spacer sounds workable. Just make sure that you have enough clearance in the swingarm to accommodate any extra length of the studs for the sprocket.

RD,
+5 on that remember you can use aero-nuts or Nyloc nuts BUT there must be 4 clear threads on the former & " clear threads on the latter for them to be used safely .

This is only a guide BUT I NEVER re-use NYLOCS on anywhere my life depends on them !!!!!! and I always check the bike over as a matter of course after a ride to make sure chain and nuts etc have not backed off and gotten loose.