Front brake master cylinder for 7/8 inch bars

[DrunkenMistake]

Hey guys, im after a front brake master cylinder for a twin disc sports bike,
Second hand is fine, tidy would be fantastic, has to be something off a high performance 600 or bigger,
I wouldnt like to spend much more than $100ish, but if you have something that tickles my gouche I could wrestle up the funds to go a little bit higher.

Preferably like something with a remote reservoir pot, but im not picky, Ill be needing to find one by Thursday morning so I can pay for it and have it by Saturday (with luck)



EDIT: Must be a complete master cylinder, so Master, Reservoir, and lever and mounting hardware.

[Kickaha]

What bore size?

[ducatilover]

Got a ZZR400k/600D one you can have bro, it might need a new res. cover, but works well.

[tigertim20]

What bore size?

its to replace the stock piece of shit on a 2006/7/8 Hyo GT650R.
I assume it doesnt matter if he goes larger as that will displace more?

[Kickaha]

its to replace the stock piece of shit on a 2006/7/8 Hyo GT650R.
I assume it doesnt matter if he goes larger as that will displace more?

Bigger means less travel and firmer lever, you probably don't want to be to far either side of stock

[ducatilover]

Bigger means less travel and firmer lever, you probably don't want to be to far either side of stock

Wouldn't the swept volume or the master cyl. bore be a bigger influence over just the bore size?

[bogan]

Most masters with similar brake set-up will probably be workable if bore sizes are hard to find. Twin disc with two-pot floating or 4 pot fixed calipers should do the trick. Doug's spare might work pretty good?

Or give bikebusters (i think that's the guy just out of hamilton) a call and he should be able to hook you up.

What's wrong with the original one btw?

[ducatilover]

What's wrong with the original one btw?

Hyosung.


'Nuff said lol

[DrunkenMistake]

What bore size?

I wasnt aware that this would cause a massive problem

Most masters with similar brake set-up will probably be workable if bore sizes are hard to find. Twin disc with two-pot floating or 4 pot fixed calipers should do the trick. Doug's spare might work pretty good?

Or give bikebusters (i think that's the guy just out of hamilton) a call and he should be able to hook you up.

What's wrong with the original one btw?

Its pretty stuffed, I was going to upgrade the master, lines and pads anyway but the master is in need over an overhaul/rebuild and for the frustration and cost of doing it, I might as well start by upgrading the master now..

If I can find out the bore size, could anyone make a recommendation on a master that I should be looking at getting? any help would be fantastic.

[The Lone Rider]

Try

Good Parts LTD
Motorcycle Dismantlers
2 Brackenfield Place
Parklands
Christchurch 8093


Sorry I don't have a number or email. He's on Trademe though.

He went above and beyond in finding me a part that fit what I was working on - off a different model bike. And we did it all be email, and posting parts back and forth until I got one that actually fit.

[bogan]

I wasnt aware that this would cause a massive problem

Get it massively wrong and your brakes will be fucked, lever force is proportional to the bore radius squared, and go too low and you won't displace enough fluid to fully activate the brakes.

Its pretty stuffed, I was going to upgrade the master, lines and pads anyway but the master is in need over an overhaul/rebuild and for the frustration and cost of doing it, I might as well start by upgrading the master now..

If I can find out the bore size, could anyone make a recommendation on a master that I should be looking at getting? any help would be fantastic.

It's a 2008 model, must be made of cheese to need a rebuild by now! I just did my 24yo Honda's master a few months ago, only 40 bucks for a full rebuild too.

What are the symptoms? may be that something else is a problem instead/too. Also, upgrade to full floating calipers is likely to provide a big benefit, and may require another change in master if you do that eventually.

[Kickaha]

I wasnt aware that this would cause a massive problem

It most likely wont but
Go to small and you end up with excess travel as the smaller piston has to travel further to displace the same volume of fluid
Go to big and the lever feels like squeezing a brick as it has to move bugger all to displace the same volume of fluid

Chances are anything with similar brakes will be in the ballpark but it's just something to be aware of, the m/c normally has the size on it

[Steve Gauge]

there should be a number on the side of the master cylinder

[DrunkenMistake]

It most likely wont but
Go to small and you end up with excess travel as the smaller piston has to travel further to displace the same volume of fluid
Go to big and the lever feels like squeezing a brick as it has to move bugger all to displace the same volume of fluid

Chances are anything with similar brakes will be in the ballpark but it's just something to be aware of, the m/c normally has the size on it

there should be a number on the side of the master cylinder

Thanks ill go have a check of it now and see what I can find!

[DrunkenMistake]

Ok had a look, says on the back of the master TCIC 5/8 on a little further on it just says 1
If this means anything