Author Topic: RD250 Type 522 1975 from DE, resto in PL  (Read 332 times)

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Offline adrian1024

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RD250 Type 522 1975 from DE, resto in PL
« on: September 14, 2020, 08:18:14 AM »
Hi,
Recently i bought RD250 1975 522 from German Ebay. I took decision mostly because of quite good price (at least i toght so)

My uncle brought me a motorcycle because he trades cars from abroad.
After the delivery of the motorcycle and the evaluation of the technical condition, I already knew that it is worse than I thought and a lot of work awaits me.

Front brake pump was blocked. Brake hoses are dead also.
In the air filter box there is no upper cover. Is it necessary? I could not find anywhere on the Internet. Yamaha does not sell them anymore.

The thing I am most afraid of is restoring the electric wire harness. Mine is quite destroyed. Does anyone in the forum offer new  at a reasonable price? Those from ebay or stores cost £150-300, which Is too expensive for me.

Cylinder heads are from younger RD (1a2 i think)

Below you can find some some pics of bicycle.







Offline Gr8uncleal

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #1 on: September 14, 2020, 09:07:19 AM »
Ignore my request for details on your other post!

Yes, very important that the air filter box lid is fitted. They do turn up on ebay, often from the US, but occasionally from Europe. I don't want to put words into his mouth, but forum member sfbrain might be making some using 3D printing.

Wiring can often look worse than it actually is, so post some photos of what is concerning you.

If not seized/rusted up, the brake system can be stripped down and cleaned.

Obviously a previous owner liked red!
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400 bitsa
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125B (probably!) now being reassembled
Yam AS3 in boxes

Offline GR400

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #2 on: September 14, 2020, 09:16:13 AM »
Hi and welcome.  Your bike looks quite solid.  Are you just trying to make a good runner and not too worried about it being perfect?  (that costs a lot of money).

Norbo at RDLC Crazy lists the A/B wiring loom for £60:
https://rdlccrazy.co.uk/html/A%20C%20for%20sale.html

and forum member sfbrain is reproducing the airbox lid in plastic:
http://www.aircooledrdclub.com/smf/index.php?topic=61610.msg488520#msg488520

Good luck!
'80 RD400F, restored
'75 RD350B. Not touched for at least 20 years. Next up
'01 ZRX1200R
'01 GSX-R1000 K1

Offline adrian1024

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #3 on: September 14, 2020, 10:44:51 AM »
The plan is to paint the frame with the smaller elements in black as in the original and the body elements, i.e. fuel tank, side covers and headlamp in red.
Chrome-plated elements look quite good and I think that after polishing with autosol paste they will be in a nice but not perfect condition.

Thank you very much for the engines for printed items and rdlccrazy pages. I needed this.
I have many more pictures, because the motorcycle was dismantled practically to the last screw. I will try to add later.

The pistons are nominal. Crankshaft is fitted with yamaha conrods. According to the speedo bike have aboout 60 thousand kilometers. I assume the cylinders were certainly changed, but could the RD cranshaft shaft handle so many kilometers without repair?

Online 2T

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #4 on: September 14, 2020, 12:38:55 PM »
I have got items from Norbo on the RDLCCRAZY forum, he is good
to deal with and had very reasonable pricing.

those heads do look to be from the later c/d models.

normally the advice after getting a bike of this vintage is to strip and rebuild
if you are unsure of its history.

what tends to happen is the crank seals harden especially when the bike is
stored for long periods of time.
“If everything seems under control, you're not going fast enough.” ? Mario Andretti

Offline adrian1024

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #5 on: September 14, 2020, 08:34:26 PM »
Some another pic's of motorcycle dissasembly



Wires inside the headlamp

and main loop


Ignition plastic connectors are weak of being old and fragile


1a2 engine head

Motor out of frame

Pistons - large clearance between the cylinder. visible black marks. Probably piston rings are worn.



Frame and other small elements sorted. This will be powder coated in black.







Today i tried to move brake piston calipers with compresed air. In the ends of brake cylinder there is some corossion. I put some wd40 on pistons and waiting if this helps something. If not then probably will have to search for brake in better codition.
« Last Edit: September 14, 2020, 08:37:39 PM by adrian1024 »

Offline pidjones

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #6 on: September 14, 2020, 11:59:38 PM »
You can use a grease nipple in place of the bleed screw, solid bolt in place of the banjo bolt, and pump the right out. You might need to block one if it comes too easy so the oher one will come out. Clean out the grease (has to be cleaned, anyway) with paper towrls and rebuild.
"Love 'em all... Let GOD sort 'em out!"

Online betty foRD

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #7 on: September 15, 2020, 08:28:29 AM »
My grease gun goes strait onto those bleed nipple..
Rev 'em till they rattle

Offline adrian1024

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #8 on: September 21, 2020, 11:29:26 AM »
Thank you for idea with grease gun. It worked pretty well. Cylinder pistons after cleaning looks like new. Are they made from stainless steel?

I have a question about gaskets.

Can i use set for 76-79 RD especially cylinder head's copper gaskets if i have 1a2 heads and early 73-75 cylinders?


Online betty foRD

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #9 on: September 21, 2020, 12:59:31 PM »
No you can not use that type of head gasket with your engine.

But you can reuse the head gaskets you took out. You need to heat them red hot first to anneal them.
Rev 'em till they rattle

Offline Gr8uncleal

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #10 on: September 21, 2020, 01:10:16 PM »
Adrian, PM sent.
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400 bitsa
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125B (probably!) now being reassembled
Yam AS3 in boxes

Offline adrian1024

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #11 on: September 22, 2020, 06:56:11 AM »
Another update

I get package with custom made brake hoses. I also bought new brake shoes for rear wheel. New front suspension sealings (still waiting for dust seals), ariete grips.

I decided to buy almost new nissin brake pump from 2016 CBR 125 with integrated brake lamp switch.
Repair kit for original pump was in the same price or even higher. In addition i would have to repaint it anyway.That's another cost. Also is difficult to select a paint that will not unstick under the influence of brake fluid. You will never get factory quality.

Yesterday I got pictures of the frame from a painter. I should pick them up by the end of the week. He surprised me with such a quick realization.














Offline Gr8uncleal

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Re: RD250 Type 522 1975 from DE, resto in PL
« Reply #12 on: September 22, 2020, 08:46:55 AM »
Make sure that bare metal is available for the earthing areas and that the paint isn't too thick where the head races, swing arm bushes etc fit. I spent a lot of time rubbing paint off one of my bikes for this reason!
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400 bitsa
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125B (probably!) now being reassembled
Yam AS3 in boxes