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Anybody uprated their front 3AJ brake? Anybody uprated their front 3AJ brake?
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 20 Dec 2004
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Anybody uprated their front 3AJ brake?
I am lookings for some information.

Has anybody upgraded their front brake, perhaps to a two piston caliper (slider/floating), from the original one piston caliper? The 1990 XT600 introduced a Nissin two piston caliper, but the mounting is different. I am not sure who the original manufacturer was or if a "beefier" straight bolt-on caliper is available from another
model? The original's two mounting holes are approx 11cm apart.

Any guidance or advice would be appreciated.

Thanks, Geoff
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  #2  
Old 27 Dec 2004
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Hi dont know if it will help you but I ve got a Nissan 2 pot front caliper that was fitted to the 1990 xt. I bought it for a 86 xt 600e Im restoring and it wont fit without some form of modification .
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  #3  
Old 27 Dec 2004
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Hi George,

Thank you for the reply.

It looks as though you have the problem I was foreseeing with the later caliper. I have a little bit of information (from the 1990 XT600E Model Guide) that may help us both, and I will send you an email.

I was hoping there may be a two piston sliding caliper from an old model (Yamaha, Honda, etc...), that may have fitted straight on and save the need for any modification.

Best regards
Geoff
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  #4  
Old 28 Dec 2004
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hi, i have the 2pot nissin on my 1997 XT600E and the best you can say is "adequate". its not bad for a dual sport bike i suppose but if you spend all your time on road like me you soon want something better. (especially on a supermoto). 1st(and cheapest) thing to try is a braided hose, this will give your brake better feel and power.
i want a bigger disc but then the original caliper needs repositioning, and if i have to do that theres no point putting the naff one back on so i need a better one from some other machine, then an adapter bracket must be made for the new caliper/disc positioning. not too much of a problem making the parts but if i had a more common bike (honda, KTM) i could do it off-the-shelf. i think i will go for a 4pot off a suzuki bandit, anything more is ott and parts are cheap+easy on ebay

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  #5  
Old 28 Dec 2004
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Hi Dave,

A braided hose is a good way to go, and I have a Goodridge hose to fit. Hopefully I will be able to upgrade the hose and caliper at the same time.

Your comment of "i think i will go for a 4pot" - I think you have to be a bit careful with a 4-pot, as many are too wide for a spoke wheel. The other thing to keep in mind is that it will not be a floating caliper, and so should be fitted with a floating disc.

I think your '97 XT600 has a number of options with its' mounting lugs. Unfortunately my older machine has different spacing of its' mounting lugs, and may not have an easy solution. I guess I will need to look into a mounting adapter.

Ciao, Geoff
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  #6  
Old 30 Dec 2004
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hmmm, good thinking geoff, i never thought of that. ive gone down to a 17" rim instead of 21" on the front, so the spoke angles will give me a few more mm, and a larger disc should give a few more, but still it needs careful consideration. there must be a few bikes out there with floating 4pot calipers,
or,
maybe even easier, is to machine a disc carrier to fit the XT hub and mate it to another bikes disc. then spares will be no problem and i wont have to worry about a floating caliper.

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  #7  
Old 12 Jun 2007
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Hey I need that caliper!
Quote:
Originally Posted by chikengeorge View Post
Hi dont know if it will help you but I ve got a Nissan 2 pot front caliper that was fitted to the 1990 xt. I bought it for a 86 xt 600e Im restoring and it wont fit without some form of modification .
Just posted looking for that caliper! Want to sell it? Good shape?

Zombie Master(Neil)
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  #8  
Old 12 Jun 2007
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Hi, would it not be possible to get lower fork from later bike and fit later brake caliper .
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Old 14 Jun 2007
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Hi Brian,

I'm afraid I don't know the answer to your question, but I have been wondering about a different solution.

The XT750Z Super Tenere has the same wheel size and fork length, plus a twin front disc set-up. The downside appears to be that a complete front-end would be needed: Triple Tree, Wheel, etc..... Has anybody done this?

Thanks,
Geoff
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  #10  
Old 21 Jun 2007
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Quote:
Originally Posted by GeoffE View Post
Hi Brian,

I'm afraid I don't know the answer to your question, but I have been wondering about a different solution.

The XT750Z Super Tenere has the same wheel size and fork length, plus a twin front disc set-up. The downside appears to be that a complete front-end would be needed: Triple Tree, Wheel, etc..... Has anybody done this?

Thanks,
Geoff

I was thinking about this myself, I was wondering if the super ten forks are the same diameter as the 600? I dont want to go putting new triple clamps etc on the bike, I'm curious as to whether this is a total non starter or not. Would you have to fit new races for the super ten triple clamps etc to fit?

My XT has been fitted with a KLE front end, with a bigger disc, and braided hoses, but still, the breaking could be better. I fitted goodrich hoses and decent pads on my old DR600 Raider, which also had a fork brace fitted, and it stopped great. Maybe a beefy fork brace steadies up the front enough to allow the bike to break better?

Pete
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