Author Topic: converting rd 200 for classic air cooled racing class,fork options needed  (Read 1046 times)

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Offline crashoften

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hi gents,
i have started to develop an rd 200 for track use,perhaps to start racing in the 250cc air cooled class with crmc,
not the usual choice i know but ive started now so ill finish it and see how i get on as never done any road racing only enduro and lots of road riding
engines off having lc 250 inlet rubbers,reeds and a race tune,i have delugged the frame and welded some extra strength onto the frame its now ready for sot blasting and painting,
brakes are all refurbished.
 i have a set of astralite wheels that i want to use.
my question im hoping for some help on is forks,
i can only fit forks upto 1981,and upto 34mm dia,
i after advice on what forks to fit,expect i will need to get spacers made up.
thanks in advance for any help,

Offline kawazonkey

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LC ones? I know they fit an RD250. Are you allowed twin discs or do you have to stick to just the one?

Offline crashoften

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Thanks, I will have to find some detailed spec sheets for them and check it out,
I think I  can run twin discs, new to it so will also check specs for racing.

Offline andy_g

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Forks are easy, just depends on your budget. You need to check the rules for the Post Classic 250 Aircooled class. upto 38mm.

We all run RD250 35mm forks as I can fit K-Tech cartridges into them. Gav uses 38mm forks, again with K-tech cartridges I fit to them.

Hope that helps. I may have some sets of Original TZ350 internals somewhere.

You dont need twin disc, we all run Lockheed caliper on a 298mm TZ disc. EBC GPFAX018 pads and a 12mm Grimica master cylinder of a scooter.
« Last Edit: January 25, 2021, 10:37:40 PM by andy_g »

Offline andy_g

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35mm forks with cartridge conversion. Compression, rebound and pre-load adjustment all from the top.

Offline crashoften

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thanks men,

i will crack on with the lc 250 forks i have bought and see how they work on the 200 frame,

will have to see how the frame handles with std lc brake caliper,im restricted to pre 81 parts to get my crmc bike eligibility certificate,

lots to do but all coming along nicely at the moment,

engine back in a month by which time i will have rolling chassis ready,

look forward to getting some track time to set it up,


Offline crashoften

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getting there,

got lots of setting up to do,hopefully do most of engine set up on dyno,then sort the handling as best i can,

lots of time and money spent,lots more still of both to put into the start of my road racing,

i welcome plenty of constructive criticism on my build,

i know its the wrong bike to start with and its been difficult to source parts and knowledge due to this,

cant wait to give it a go on 22.5.2021 at brands on a track day,

all going to be about corner speed i think :-\


Offline crashoften

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i am looking for an early tz 125 tank if anyone has one knocking about or knows of one,metal preferably as i have been told modern petrol plays havoc with the glass fiber ones,

or though this could be wrong !

TIA

Offline kawazonkey

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Ethanol eats plastic tanks! And hoses...and clogs stuff up. Why the hell they add it to petrol is beyond me.

Offline CBM

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Ethanol eats plastic tanks! And hoses...and clogs stuff up. Why the hell they add it to petrol is beyond me.
And the ba5tards are adding another 5% in Sept.  :-[ :-[ :-[
Thankfully for now Esso Premium in most areas is still ethanol free