Anyone in Melbourne got a chain-breaker?

I've got new chain and sprockets to fit to the CB900 Hornet. I'm
interested in doing it myself rather than taking it to a mechanic, just
so I can see how things work in there a bit better. I don't, however,
have a chain breaking tool or any experience with this sort of thing,
so...

If any of you Melbiourne guys have the gear, a bit of time and the
inclination, I'd be happy to bring around a slab one night or weekend
if you could help me sort it out. Sooner's better, the old chain is
knackered good and proper and about to start dragging on the bloody
centrestand (poor maintenance by previous owner).

Of course, if this is better done by a qualified mechanic, let me know.

Cheers
Loz

 

You anywhere near the Outer Eastern Subs?

cheers
pete

 

If no one has one, I picked up an Emgo chain breaker/riveter for $65 the
other day. Looks pretty much exactly the same as the Motion Pro ones, except
without the price tag. It'l break all chains as well as cam chains (my
intended purpose for the time being).

Cam

 

Hey, it's all Melbourne, right? I can get out there no probs.

 

Yeps loz, for breaking a rooted chain... a 100mm angle grinder is your
friend~~

Johno

You need a beer first tho....

 

no mate....


Johno

 

No bloody good for the vfr cam chain tho.... ;(


Johno


Beer cam?

 

Yeps loz, for breaking a rooted chain... a 100mm angle grinder is your

Yeah mate, but I think I need a proper tool for shortening the new
chain and putting it all back together... Or perhaps I'm showing my
ignorance. Wouldn't be the first time. Wouldn't be the first time this
week, even!

 

grinder will work for that to!! just shave of the rivets

I had a chain braker...but I broke it, but the riveter still works

Marty H

 

You should be able to pick one up from Sprockets Australia in Yarraville
Otherwise, you can use an angle grinder to take it apart and a hammer and
punch to rivet it back together again
this method has been tried on numerous occasions on track days with great
success, although power could be a problem at the track, you can always use
a cold chisel, the rivets are only soft copper

 

For Sure.
Chain breakers, excepting extrordinarily expensive ones, have a habit
of destroying themselves.
A carefully wielded angle-grinder is the best tool for the job. To
install the clip-link if it is tight (as it should be), use a G-clamp
and few pieces of square bar or allen keys to press the sideplate onto
the clip pins. Use a blade to make sure the clip has engaged properly.
Ask your friendly spare parts person how many links you will need to
cut off your chain (assuming you are running standard gearing they will
be able to look it up). If you are particularly nice about it, they may
even take it out back and cut it to size.

 

I'm actually going to a 1-up on the front, 3 down at the rear gearing.
I wonder how much this will affect the chain length? Perhaps I'll just
have to play it by ear a bit.

 

So wheredidyageddit?

big

 

Any good moto store will be able to order one in.

 

I have made up a formula to calculate chain length based on sprocket
sizes, pitch and centre distance but the easiest way is just to start
somewhere aroundabout the smallest adjustable centredistance (important
for chain slack adjustment later on) and cut the chain to size 'on' the
bike.
If anyone wants the equation I'll type it up and post it. Quite easy to
derive though.
I've got it implemented in Excel somewhere too..

 

At Lowes ?

 

Yeah, that'd be nice. Link the .xls too if you can be bothered...
Cheers
Loz

 

OK.

Rf = Radius of Front sprocket in mm (measured to 'chain' centreline)
Rr = .... REAR Spkt "
ß = 'An Angle' IN RADIANS!!!
D = Centre Distance (mm) between the sprocket axes.
Pi() = Pi =~ 3.141592654
Lp = Chain centreline path length
LINKs = Chain length in links

^X Denotes "To the power of X"
Note that ^0.5 means "The square root of".


To calculate Your Sprocket Radii:

'Chain Centreline' Radius = [(Number of teeth)*(Pitch in mm)]/[2*Pi()]

For a 520 chain, the pitch is 5/8in. For a 428 chain, the pitch is
4/8in. For a
630 chain, the pitch is 6/8in. For a 530 Chain, the pitch is still
5/8in. Get the picture??
5/8in = 15.875mm = the pitch of a 520 chain in mm.

Now.

ß = arcsin[(Rr-Rf)/D] IN RADIANS!!!!!!!


Now plug everything into this sucker

Lp = Rf*(Pi()-2ß) + Rr*(Pi()+2ß) + 2*(D^2 - [Rr-Rf]^2)^0.5

....probably not in its simplest form but it works and a mathematician i
am not!!
If you are and can simplify it, please repost it simplified!

Now to convert this number (Chain path length in mm) into number of
links, divide by the pitch length of the chain in mm.

NOTE:
It's accurate in my experience to about +/-5mm (chain length). This is
attributable to inaccuracies in the measurements made and manufacturing

tolerance of the chain and sprockets. If you are a shitty measurer it
will be a lot worse. It will be thrown out of whack if a chain roller
is used (ie some dirtbikes). I have another equation for that one.
Note also that the centre distance changes during rear suspension
travel.

Easy enough to plug into excel, and I don't have anywhere to host the
file.
I'll email it to you if you like.


Chris

Spada Deluxe

 

With pleasure:


$p = "(02) 9439 3549"; # number of local Yamaha dealer
$s = "Bob"; # spare parts guy at local Yamaha dealer
$q = "What size chain do I need for my 1996 YZF1000RF?"; #question for Bob

$chain_size = ($p * ($s + $q));


Happy to help.

GB

 

Perhaps "What size chain do I need if I bugger around with my sprocket
sizes"

....ya clown.

Thanks chris.