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Compression adjusters seized


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Major_Tom

 
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Compression adjusters seized

Sun Dec 20, 2009 11:58 pm » Post: #1 » Download Post

Have had my 28SE for a week now and I love it. Partly of course because of the adjustable suspension, however I recently found that the compression adjusters on the forks and rear reservoir are seized! Hardly adjustable now are they? Is it possible to pull the adjuster to bits and try clean out the rust (I'm assuming it's rusted into it's current position), or should I just get some new parts? Or just get new Ohlin's front and rear Twisted Evil

Cheers
Tom
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Dave Ett
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Mon Dec 21, 2009 8:53 am » Post: #2 » Download Post

Are you sure it's siezed from rust and not just hard against one of it's end stops?
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Andy
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Mon Dec 21, 2009 9:02 am » Post: #3 » Download Post

And just so you don't try and adjust something you can't... they are 'rebound' adjusters, not compression adjusters. The MC28 SE/SP is only adjustable for preload and rebound.
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Matt@TYGA
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Mon Dec 21, 2009 11:41 am » Post: #4 » Download Post

Actually, the MC28 SP forks do have comp adjustment. It's built into the rebound adjuster. So when you twiddle the funky blue knobs it affects both rebound and comp.

The MC28 SE, and MC21 SE/SP are rebound only
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Russ

 
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Wed Jul 21, 2010 9:27 pm » Post: #5 » Download Post

I've taken these fork caps off Tom to try my luck in getting these adjusters unseized.

The adjusters seem about half way in their range, so they are probably not tight against the stoppers.

I suspect some corrosion between the alloy and the brass components. I have tried GT85 spray, mild heat and a soaking in an ultra sonic cleaner but they are still fast.

An impact driver has been sugested by an engineering mate but this seems too much for the brass bits.

Any advice welcomed

Thanks
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Andy
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Wed Jul 21, 2010 9:53 pm » Post: #6 » Download Post

Russ wrote:
I have tried GT85 spray, mild heat and a soaking in an ultra sonic cleaner but they are still fast.

Must be a first for any MC28 part! Laughing
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paul g
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Wed Jul 21, 2010 10:25 pm » Post: #7 » Download Post

I Have just stripped a set of mc28sp forks with the same problem, as you suggested the alloy part had corroded and caused the adjuster to seize.

I took the fork cap off, took the adjuster apart and cleaned the corrosion in the adjuster hole with wet and dry. Definetely wouldnt hit it with an impact driver, once you have the cap out you can grip the brass adjuster in a vice and wind it out, their is a little ball bearing retained by a spring which you have to remove first though.
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Russ

 
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Wed Jul 21, 2010 10:27 pm » Post: #8 » Download Post

Andy, thats because they are now being bolted onto an MC21, makes all the difference Wink
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Last edited by Russ on Wed Jul 21, 2010 10:32 pm; edited 1 time in total
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Russ

 
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Wed Jul 21, 2010 10:32 pm » Post: #9 » Download Post

Thanks for the tip paul, I'll give that a go.
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watfordhorn
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Wed Jul 21, 2010 10:57 pm » Post: #10 » Download Post

Is that a MC28 part thats far superior to any other NSR model?

Talking about the SP forks here Andy, not the OOTB fully HRC ready PGM with just a simple card change Wink
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Neal

 
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Thu Jul 22, 2010 6:54 pm » Post: #11 » Download Post

I have a set from my nc30 forks that you can have if you need them . I bought the blue tyga tops and they work well .
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fontyyy

 
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Thu Jul 22, 2010 9:52 pm » Post: #12 » Download Post

watfordhorn wrote:Is that a MC28 part thats far superior to any other NSR model?

Not sure "far" is quite the phrase, but yes they are allegedly the best.

But the "the OOTB fully HRC ready PGM" is matched at peak (and slaughtered in the midrange) by a stock wirespliced PGM-II.
Same bike, same motor, same carbs, same jets, just the loom, PGM and flywheel swapped.
Wink
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Russ

 
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NC30 Adjusters

Fri Jul 23, 2010 6:42 pm » Post: #13 » Download Post

Hi Neal,

They would be handy, i believe they are the same part fittment.

It doesnt look like these are going to shift, tried the vice tip with no luck. If I tightened it any more the brass would be crushed.

Can you get a quote for postage to the UK

Cheers

Russ
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Neal

 
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Sat Jul 24, 2010 6:30 pm » Post: #14 » Download Post

No problem , pm you on monday .
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