1983 Yamaha Maxim 650 - brake upgrade? - Chicagoland Sportbikes
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post #1 of 32 (permalink) Old 09-20-2010, 03:08 PM Thread Starter
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1983 Yamaha Maxim 650 - brake upgrade?

My brakes are SUPER soft, and I think part of the problem is the front suspension. I can just about bottom it out with little force. I have new pads on the front, but it just doesn't bite like it used to. Just trying to play around with ideas here. It's a temporary bike for me, so if it's going to cost a lot of money, I'll just stop riding it.

Any cheap band-aids I can get to improve stopping power? Or any ideas to fix the front suspension on the cheap? Would new fork oil make a big difference? I don't want to buy new springs, anything else I can do?

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post #2 of 32 (permalink) Old 09-20-2010, 03:18 PM
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measure the i.d. of the fork and buy some pvc tubing and make spacers. 1 1/5 to 2 inches should stiffen that thing up.

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post #3 of 32 (permalink) Old 09-20-2010, 03:19 PM
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toss the left over pvc in the front spokes while moving to halt forward progress.

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post #4 of 32 (permalink) Old 09-20-2010, 03:33 PM
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heavier oil
increase the preload with spacers
new master cylinder for better pressure to the brakes
bleed the fluid
stainless lines

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post #5 of 32 (permalink) Old 09-20-2010, 04:04 PM
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Gixxer forks.

Heavier oil won't help much in my experience (gs500e). I did buy a piece of milled aluminum that was a wee bit smaller than the fork tube and about an inch long that made the progressive springs a bit firmer but they would bottom out an inch early too. Probably not a route you want to go with this one either. That's all I have for cheap fixes.

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post #6 of 32 (permalink) Old 09-20-2010, 04:07 PM Thread Starter
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Originally Posted by Pilotx1 View Post
heavier oil
increase the preload with spacers
new master cylinder for better pressure to the brakes
bleed the fluid
stainless lines
Any idea where I can get these parts for this bike (or a compatable)?

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post #7 of 32 (permalink) Old 09-20-2010, 04:11 PM
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sorry but this is all I can think of
Throw a dozen or more on and its like engine braking!!!!
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post #8 of 32 (permalink) Old 09-20-2010, 04:13 PM
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any master cylinder from a more current bike, as long as the bar diameters are the same all you need to match is port positioning, and even that doesnt have to be exact

shit i might have one laying around at home ill look

stainless lines might be as simple as an off the shelf for another bike just need to match the length mainly, i think galfer and the others make custom lines as well.

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post #9 of 32 (permalink) Old 09-20-2010, 04:13 PM Thread Starter
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I found a master cylinder rebuild kit at Z1 Enterprises, would that be an improvement? I assume it's working properly, but would it be worn after 27 years? The bike only has 14,000ish miles. The lever pull feels fine, but the bike just doesn't slow down much :P

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post #10 of 32 (permalink) Old 09-20-2010, 04:14 PM Thread Starter
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Originally Posted by Pilotx1 View Post
any master cylinder from a more current bike, as long as the bar diameters are the same all you need to match is port positioning, and even that doesnt have to be exact

shit i might have one laying around at home ill look

stainless lines might be as simple as an off the shelf for another bike just need to match the length mainly, i think galfer and the others make custom lines as well.
What about the connection to the brake? I haven't looked, but would it be the same as modern bikes?

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post #11 of 32 (permalink) Old 09-20-2010, 04:52 PM

 
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good luck getting any more out of those brakes.Give bleeding a try and scuff the pads.

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post #12 of 32 (permalink) Old 09-20-2010, 05:14 PM Thread Starter
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good luck getting any more out of those brakes.Give bleeding a try and scuff the pads.
You would know better than anyone think it's worth it to improve the suspension? New springs and seals would be about a $100. That's about as much as I'm willing to spend.

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post #13 of 32 (permalink) Old 09-20-2010, 05:47 PM
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Quote:
Originally Posted by PatFitz9 View Post
What about the connection to the brake? I haven't looked, but would it be the same as modern bikes?
the banjo fitting hasnt changed much in decades

a significant weight increase in then oil helped immensly on my friends ex250, as did the preload spacers i added, it didnt add braking power persay but let the rider use more of what was available without bottoming

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post #14 of 32 (permalink) Old 09-20-2010, 06:07 PM

 
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my old maxum in college i ran 15w fork oil and bled out all new brake fluid and it stopped on a dime and handled just as good!


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post #15 of 32 (permalink) Old 09-20-2010, 06:17 PM Thread Starter
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You got dem fancy rotors!

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post #16 of 32 (permalink) Old 09-20-2010, 07:56 PM

 
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Pat i think i added spacers I'll check my notes.I believe i went though the brakes with fresh fluid, although 6 months ago they may well need another bleed.

Those 30yr old rubber parts may need replacement.

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post #17 of 32 (permalink) Old 09-20-2010, 08:06 PM

 
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front brake clean and bleed,

Rear brake shoes replaced.

No notes on spring spacers.But never a bad idea on these old 80's bikes especially those no longer holding air in the forks.

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post #18 of 32 (permalink) Old 09-20-2010, 08:08 PM

 
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my notes say 81' same bike???

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Last edited by resurrection; 09-20-2010 at 08:12 PM.
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post #19 of 32 (permalink) Old 09-20-2010, 08:19 PM
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FWIW, the master cylinder on my CB360 when I got it was complete shit. I took the advice from another forum and picked up an aftermarket CB400 brake. It improved my braking 4x. These are on eBay a lot.

http://cgi.ebay.com/ebaymotors/FRONT...item1c1596e134
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post #20 of 32 (permalink) Old 09-20-2010, 08:20 PM
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IMO rebuild kits are not really worth it, and a hassle to get fixed.
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post #21 of 32 (permalink) Old 09-20-2010, 08:23 PM
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Replace the lines with stainless. End of problem.

The stock rubber lines weren't all that good when new, and with age they swell considerably.


Check out XJbikesD0Tcom, it is a forum set up specifically for owners of Maxims and Secas. XJforever is a supporting member, and can get some pretty good deals on parts for your bike, but the lines are pretty easy to find. The forks aren't your problem.
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post #22 of 32 (permalink) Old 09-20-2010, 08:28 PM Thread Starter
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Quote:
Originally Posted by resurrection View Post
my notes say 81' same bike???
I think it's an 82. Brain fart when I posted the thread title, but it's either an 81 or 82. Do you remember what type of fluid you put in there?

I'll look into the stainless lines. Thanks guys!

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Last edited by PatFitz9; 09-20-2010 at 08:44 PM.
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post #23 of 32 (permalink) Old 09-20-2010, 08:49 PM
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pat dot 3 or 4 will likely be adequate on it

glass beading the rotors will help too

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post #24 of 32 (permalink) Old 09-20-2010, 09:04 PM
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Pat funny you posted this up. I just flushed out the mud type fluid that was in the front brakes of my brothers 82 Maxim 750. It has 34K miles on it and I honestly think the stock fluid was in there. I wasn't going to buy any parts for the bike as I was trying to keep things on the cheap side. He got the bike for free about 2 weeks ago and he just picked it up last Wend. Is this ur bike???
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post #25 of 32 (permalink) Old 09-20-2010, 09:09 PM Thread Starter
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It was my first bike, and now that I sold the Warrior, I'm riding it again. Also free for me

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post #26 of 32 (permalink) Old 09-20-2010, 09:20 PM
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Nice!!!! I will have to come by and take a peek at it one day
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post #27 of 32 (permalink) Old 09-20-2010, 09:25 PM Thread Starter
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You can come by and help me fix up the brakes

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post #28 of 32 (permalink) Old 09-20-2010, 09:36 PM
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Quote:
Originally Posted by G2G View Post
He got the bike for free about 2 weeks ago and he just picked it up last Wend. Is this ur bike???
Does the VIN match the title? Too soon?

A decent set of tires will make all the difference in the world with stopping. Don't overlook them.
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post #29 of 32 (permalink) Old 09-20-2010, 09:56 PM

 
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Quote:
Originally Posted by Cooter View Post
Replace the lines with stainless. End of problem.

The stock rubber lines weren't all that good when new, and with age they swell considerably.


Check out XJbikesD0Tcom, it is a forum set up specifically for owners of Maxims and Secas. XJforever is a supporting member, and can get some pretty good deals on parts for your bike, but the lines are pretty easy to find. The forks aren't your problem.
+1

As i said earlier all the 30yr old rubber parts are questionable.

Prestone 3-4 stuff

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post #30 of 32 (permalink) Old 09-21-2010, 07:51 AM Thread Starter
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Hrmm stainless steel lines are a bit more money that I thought, this might have to be a winter project. Thanks for the link to xjbikes, I wish I knew about that site earlier! Great resource.

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