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1986 TT600 Shock problem 1986 TT600 Shock problem
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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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It's going to be a long 300km...
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  #1  
Old 6 Aug 2007
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1986 TT600 Shock problem
Hi

Greetings from Maritzburg, South Africa.
Congrats on a brilliant site.

Some help please.
I have a 86 TT 600, I have just had the mono shock rebuilt, it was leaking oil.
The problem I have is that the bike still sits quite low, is there a way of adjusting the shock to correct this?

Any comments or suggestions would be appreciated.
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  #2  
Old 6 Aug 2007
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Increase
The preload?

Auke
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  #3  
Old 6 Aug 2007
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Thanks Auke

At risk of bieng a complete dumb ass ( Im a IT Geek), I presume you are refering to the huge nut on the shock that can be adjusted
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  #4  
Old 6 Aug 2007
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Quote:
Originally Posted by lexicon View Post
Thanks Auke

At risk of bieng a complete dumb ass ( Im a IT Geek), I presume you are refering to the huge nut on the shock that can be adjusted

That's it, Lexicon - turn it so that the suspension is harder and needs more effort on the spring to compress it. If that does not produce the result that you want, you could raise the bike at the rear by changing the setup.

BTW
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  #5  
Old 7 Aug 2007
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Thanks
I will give it a try a little later.
Cheers
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  #6  
Old 12 Aug 2007
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Make sure you dont have " high" expectations. My 84 sits quite low compared to my 93 Yz 490.
most rear shocks are from 243.5 mm to 248.5 mm adjusments (9.6 to 9.8 inches). each turn of the adjusting nut only increaes the difference 1mm. turn the nut too high, and you'll be sorry right after the first jump you take.

Also, your shock should be filled with "gas" not Oil. Front forks get oil, rear shocks are pre-loaded springs with a "gas" damper.

You can always look for an after market shock that has more travle depth and more pre-load.
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  #7  
Old 12 Aug 2007
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TT600 Spring.
Hi.
Most, if not all TT600 springs of this age will have sagged alot by now. This reduces the ride height and may or may not be correctable by moving the ride height adjustment nut. If not, you could add a spacer or fit a new spring.

By the way....a rear shock should indeed be filled with oil in exactly the same way as front forks are. The term 'Gas Shock' simply means that the unit internals are pressurised with gas, usually nitrogen. (160psi on an early TT)The remote reservoir has a sealed floating piston inside that separates the gas from the oil. There are various reasons for this gas pressurising...the unit can be inverted...bubbles are less likely to form in the oil etc, etc.

Lack of pressure can make a difference to ride height, but not as much as a worn out spring...check both.

Good luck.

David Lambeth.
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