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Technically Gr8uncleal is right. From Yamaha sales talk the DX meant Disc Brake. This applied to all their bikes of that era. Its a misconception that DX = Coffin tank models. It applies to Round tank models as well. Give Gr8uncleal a chance and he will try to help if he can  ;)

Yes that picture is the bike i have!
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I've just read through my various manuals and the round tank models with the disc brakes had different part numbers for the coffin tanked bikes, contrary to my initial thoughts. However, for the seals and springs, the part numbers for the RD200 drum and disc brake 1975 models are the same. It is likely, therefore, that the RD125 disc brake model used the same seals and springs as the drum brake model. The 125 bikes don't have the same part numbers as the 200s.

The only way to be absolutely certain is to get hold of a parts list for your bike. There happens to be one for sale in the UK at the moment and I have attached a link to this - I would recommend that you buy this, both for what you need now and future reference. Note the two models referred to on the cover!  ;)

As an aside, let me know if you come across a tank shown in the photo that Mike posted, as I'd rather like one (has to be same colour and graphics)!  ;) ;) ;)

https://www.ebay.co.uk/itm/174604243534?hash=item28a739524e:g:hs8AAOSwTXBgCGhc&amdata=enc%3AAQAHAAAAsJxeWrOubZBkaPzyP7MlW8TIX3jqdct40%2B%2B%2FgFv9L%2B9nAKX6FG8fF4S3%2FPlm%2BA7cGIG%2BKNWiOOvOV%2Fg3kE%2FL%2FIuX5wlWoA36tO5vY1G7li0soC3sy2fiSVssa3J6ZhIgYF25rSTYq%2BCs1L8nsKxQ0tQlZAIVN30Y2o8yNecz6ZshIa%2Fx94%2FhfeSj5CBTHljNTiig5eK5K14qLRKMV%2FdYkOKQU6G7bgFpPZThYBrngLuX%7Ctkp%3ABk9SR5Tn6pKeYQ
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Technically Gr8uncleal is right. From Yamaha sales talk the DX meant Disc Brake. This applied to all their bikes of that era. Its a misconception that DX = Coffin tank models. It applies to Round tank models as well. Give Gr8uncleal a chance and he will try to help if he can  ;)
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i have not a DX model just an AS3 with discbrake. this is vey common model here i i believe it is a 74/75 model.

Your right it looks like the DX model uses the same fork i have.

thank you sofar!
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Aircooled RD Tech Help 200cc and Below / Re: Battery eliminator?
« Last post by tore on Today at 09:06:59 AM »
Get a 15v zener diode and a lithium battery.

Thanks Tore, but I think I'll stick to 6 volts.
If you have use a lithium battery there is a built-in circuit that has a max voltage. You just need to have a zener to catch voltage spikes, not as a voltage regulator. Usually around 15v, even on a 6v battery. Manual on the battery will tell what is max.
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You have the first version of the RD125DX.

Only mainland Europe only got this (and the equivalent RD200DX) - UK had to wait for the coffin shaped tank DX models.

I THINK that the parts that you're after were also fitted to the first coffin tanked bikes, model code 1E7. If you give me an hour or two, I can compare the part numbers on my pdf parts list for the 1E7 with my hard copy RD200DX parts list (same year as your RD125DX) and let you know and also post scanned copies of the relevant pages.
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Torque Introduction / Re: New owner in Chicago
« Last post by Colin Johnston on Today at 08:52:19 AM »
Welcome to the club, your 350 looks great.
You should find this forum very informative.


Sent from my iPad using Tapatalk
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Hi All,

I,m try to find some partnumbers of frontfork parts, but can not find the correct catalog.
In all catalogs i can find on the web only the drumbrake fork is mentioned.
I have a discbrake at the front and want the number of the springs and seals.

who have the correct part catalog for me? or know were to find?
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Aircooled RD Tech Help 200cc and Below / Re: Battery eliminator?
« Last post by Bluehaze on Today at 08:48:17 AM »
Get a 15v zener diode and a lithium battery.

Thanks Tore, but I think I'll stick to 6 volts.
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