Chains ?????

what??

may i know what is the exact size of the chain?? i'm using 2KR EXUP model. some says that it is equipped with 428 chain, but it looks bigger than 428's. is it 520 or 530?? tnx bro's!

 

It is definitly NOT a 530, as that is what I have on my bike. A 520 may be a little over, but not out of the question. I wish I could be of more help.

 

Re: what??

I just went and checked this out.
Apparently there's 2 specified chain & sprockets setups... but i've no idea which is which.

428 chain, with 17 front & 55 rear.
520 chain, with 13 front and 42 rear.

Now, i happen to know that the stock front on a 3LN-3 is a 17... but i was pretty positive that mine has a 520 chain on it!?
I'll hunt around a bit more and see what i can come up with.

 

The 2KR has 428 chain and the 3LN has 520 chain

Just for your info the first number in the chain is the pitch expressed in 1/8 of an inch.

4 in 428 is 4/8 (1/2) of an inch and 5 is 5/8 of an inch. So the 520 chain will have less links than the same length 428 chain. Easy to measure pitch with a ruler.

The last two digits in the size, ie 20 in the 520 is the nominal thickness of the sprockets, expressed in 1/8 of an inch. This makes it 2.0/8 of an inch or 1/4" if you do not have a calculator handy.

The 28 in the 428 is 2.8/8 of an inch. Or about 0.35"

I hope this helps.

DAVE

 

Very informative post dave.

A question, as you seem very knowledgable of chains...
I'm assuming that if a 520 chain were to be put on a set of 428 chain's set of sprockets you'd end up with the chain not 'meshing' with the sprockets properly.

Interesting.

I happen to have a E263-425 front sprocket here (17 tooth) that was on my 3LN-3. Assuming the 425 is referring to the chain size, it may have been possible that the entire set had been swapped with a 2KR chain & sprocket set. Guess i'll be getting the new chain & sprockets soonish then.

On the other hand, why would a chain and sprockets distributor have in their book that the two sorts of chains and sprockets to go on an FZR250 is as i had posted above. 428 with a 17/55, or a 520 with a 12/42.
Now knowing that the stock front gearing for a 3LN-3 is for a 17 tooth front sprocket seems to imply from that that the 3LN uses the 428 chain.

Hmm.... i think i'm going to have to go talk to Yamaha about this one.

 

ahh, but you're assuming that the sprocket model number is correlated to the chain, where it says 425, and the chain is 428.
But this theory was never raised.. (probably right though)

Also, a chain mismatch (which would be an offset of 1/8th of an inch - per sprocket tooth) I think would cause one hellava problem right off the bat.

But yeah, why would 3LN's have 520's if they come with 17/55 sprockets?
Are you sure that you had a 520 on your 17/55? Cos that's whats causing the confusion here.

 

Yes a sprocket size of 425 would use a 428 chain - there's not question about that.

I'm not entirely sure that my bike came with a 520 chain unless there's something stamped somewhere on the chain; in which case i'll get out there and have a look for it. The reason i'm lead to believe that the 17/55 sprocket ratio implies a 428 chain is because of the parts book the guy at Peter Stevens had. I was in there getting some chain lube (in this case it's cheap and i like to look around for other cheap gear whilst i'm in there <!-- s:rofl: --><img src="{SMILIES_PATH}/icon_razz.gif" alt=":rofl:" title="Rofl" /><!-- s:rofl: -->) and decided to check on the chain & sprocket sizes. I guess the easy way would be for me to take in my old front sprocket and get them to pull out a 428 and 520 chain for me to check.

 

tnx for the reply bro's. i'm really confused, my previous bike is a kawasaki KMX125, im sure it uses a 428 chain coz it is stamped in every link. and im also sure that my chain now in the FZR is BIGGER than 428.

i think it is a 520. . .

what da ya think bro's? <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->

 

I'll use basic logic here: It would make sense to say that a chain with smaller links (428) would fit onto a sprocket with more teeth (17/55), because the length of a 428 and a 520 chain should be the same.. So the 428 chain, with shorter links (and therefore *more* links total) should go onto a 17/55 sprocket setup.

there we go, hopefully sorted.

I guess Dave confused us by saying 3LN's have 520 chains.
Lets all take a moment to blame dave. lol im kiddin man <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->

So count the sprocket teeth, and theres your answer.

428 chain, with 17 front & 55 rear.
520 chain, with 13 front and 42 rear.
As koma said.

But does it really matter which sprockets and chain your bike has? I'd personally go a chain with more links, to spread the strain and wear out a little more... as is the theory.

EDIT - Yeah I forgot to mention, as koma said the 3LN has 17/55's, its most likely that your 2KR uses a 520.

 

I was cleaning my chain on the weekend and it also had 428 stamped on it. I have the same type of FZR as koma.

 

Looks like there is a bit of discussion going on about chains.

When i bought my new chain for the 2KR, the book showed it as being a 428 and the later models as 520. That was at the local Yamaha dealer.

The two gear sets 17/55 and 13/42 work out to be the same ratio, and near enough the same physical size., so therefore ->

would be absolutely correct.

I presume it would be possible to swap the sprocket sets and put a 520 chain on a 2KR, the main advantage would be less links, and therefore as the links wear internally the total amount of stretch is less.

DAVE

P.S. The translated FZR 250 INFO file that is on my web site shows a 17/56 setup on 3LNs. Now I am confused too !! <!-- s --><img src="{SMILIES_PATH}/icon_redface.gif" alt="" title="Embarassed" /><!-- s -->

P.P.S. I have a 48 tooth sprocket with 520 chain on my off road buggy and that is about 320mm diameter.

 

Heh, I thought that more links would spread the strain out further, and cause less wear. I'll bet in actuality the difference is insignificant.

And theres the punch.. Maybe your Yamaha dealer's book must have gotten it wrong?? If thats possible...

Conclusion. Both sprocket and chain pairs fit both bike types. I'd just recommend the cheaper one. If you're scared of changing to the 'other' chain set, just count the teeth on the front sprocket, and go from there.

 

Ok I have spoken to a chain and sprocket gooru (my supplier) and he sas this:

original factory chain and sprocket set is a 428 chain with 17/55 or 56 (depending on the year and model) for both the 3LN and the 2KR...

you can get a 428 chain but only one manufacturer (according to him) makes one longer than 130 links (I can get is 136 and 104) FZR250 needs 130 links...

it is easier to get a 520 chain (as there is heaps more people making it) and same goes for the sprockets...

Also in his oppinion.. 520 is a little bit over kill.. (a 4 cilinder 250 does not produce enough tourque to realy strech the smaller chain)

 

TBone: which one is cheaper then?

adjudrey: Looks like your previous owner preferred the 520 layout. Whatever you want to get is your choice.


Koma, or Boz, or another moderator that I don't know about: You might want to put this somewhere informative, to clear up any confusion in the future

 

I've stickied the specific answer to this whole chain mystery thing over in the 'How-To' section... available here...
Chains - The mystery explained

 

Next time I am at the bike shop I will get the sales person to check out the book again. It was about 4 months ago when I put the new chain on and I have craft ( can't remember a f$%&*g thing). <!-- s:Help: --><img src="{SMILIES_PATH}/icon_question.gif" alt=":Help:" title="Help" /><!-- s:Help: -->

DAVE

 

having a 520 chain, fizzer requires 130 links . . how about 428's?
<!-- s:sniper: --><img src="{SMILIES_PATH}/icon_snipersmilie.gif" alt=":sniper:" title="Sniper" /><!-- s:sniper: --> <!-- s:roll: --><img src="{SMILIES_PATH}/icon_roll.gif" alt=":roll:" title="Rolling LoL" /><!-- s:roll: -->

 

Originally my FZR had a 428 pitch chain on it, with a 17 tooth front and 55 tooth rear. When I changed the chain and sprockets, I went with a 520 pitch chain, cause at the time I had NFI about it. It has a 13 tooth front and 46 tooth rear on at the moment.
They are now shagged, and I will be changing back to the original 428 chain cause it feels like I can feel this chain going around the front sprocket. I read somewhere the other day that the smallest front sprocket a 520 chain is supposed to go around is 15 teeth... Can't remember where I read that though.

Oh yeah, thought I'd better add that my fizzer is a 3LN-3

 

I have found some more info on chains
http://www.speedace.info/bluemax_bluebird_3_final_drive.htm

<!-- s --><img src="{SMILIES_PATH}/icon_offtopic.gif" alt="" title="Off Topic" /><!-- s -->

I have progressed from "L" today - also all other 5 on class passed, including one person there on an ACROSS - Might be able to sleep tonight now.

DAVE

 

Dave,

Kudos on the chain link (no pun). Good stuff.