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Author Topic: 1977 DT125 questions  (Read 1632 times)
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Tex
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« on: June 18, 2011, 06:57:53 PM »

Does anyone have a manual for the 1977 DT125 (twin shock model), as I have a few questions?

What is the standard amount of fork oil?
What type of fork oil is used as standard?
What are the standard front & rear sprockets?

Please note: These are different to the 1976 and earlier models, so there might be some differences.

Thanks
Tex
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LWC3077
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« Reply #1 on: June 18, 2011, 07:32:38 PM »

sprockets

I have no spec for 77 but

76 is 15/45 with 428 chain
78 is 15/49 with 428 chain.

That is from the www.denniskirk.com catalogue which is american so i can not 100% say for sure if Australian models were fitted with that gearing.

If you go to the JT sprockets website you will probably find an answer there too.
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WANTED - TS185C   frame.  Between   TS1852-24007  up to TS1852-39022

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Tex
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« Reply #2 on: June 18, 2011, 09:18:01 PM »

Yes, I looked on the JT site. They only offer 1 of each, but I was not 100% sure if these were also the standard size (if you get what I mean).

Tex

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LWC3077
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« Reply #3 on: June 18, 2011, 09:38:08 PM »

I can look in some books maybe tomorrow. I should have definite answer on the sprockets. Send me a PM around midday tomorrow to remind me as i might forget if im busy. I think i have a yamaha 'fast facts' book too but im not sure if that goes back to 77 though. If it does there will be oil info in there.  For my TS it says a mixture of SAE 10W30  or ATF. Yamaha was probably around the same. Fork oils were not that common then and many makers will still specifiying ATF still in the 80's

Also try http://www.sprocketspecialists.com/

also this site is great for trail bike stuff

http://www.wemoto.com/bikes/Yamaha/DT_125_F/76-77/TRANSMISSION_-_SPROCKETS_SUNSTAR/

If your doing any sort of road use i would go up a tooth on the front  or 3 smaller on the rear, especially on a 125 as it will make it more comfortable to cruise on.
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WANTED - TS185C   frame.  Between   TS1852-24007  up to TS1852-39022

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Nathan S
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« Reply #4 on: June 19, 2011, 09:25:33 AM »

I'd be amazed if the 77 model had different gearing to the 78 model.

The older Yammie short travel forks seem to work pretty well with 20W oil, as a rule.
I've never trusted the published oil volumes, particularly when the Clymer manual says that a YZ125G fork takes the same amount of oil as a YZ125C (34mm and 7" of travel vs 36mm and 12"...they're very different forks).
I'd start with 100mm from the top, and add some from there.
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Tex
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« Reply #5 on: June 19, 2011, 11:12:07 AM »

Thanks gentlemen.
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spanish armada
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« Reply #6 on: June 19, 2011, 08:15:35 PM »

nathan is that measurement 100mm from top with forks compressed or  Huh? 
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LWC3077
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« Reply #7 on: June 21, 2011, 12:58:17 PM »

Here is some info i found out

74-76 - 428 chain - 114 links - 15/45
77-81 -428H (heavy duty) chain - 118 links - 15/49

I could only find 1980 model forks and they use 183ml of 10W oil.
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WANTED - TS185C   frame.  Between   TS1852-24007  up to TS1852-39022

http://suzukits.informe.com/forum/
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Tex
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« Reply #8 on: June 21, 2011, 01:22:38 PM »

Cool, ta.
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