ByRider01
Hello,
I'm quite interested in vintage cars. I was wondering if anyone knows if you can still find throttle bodies for the old 250s or maybe 500s? (e.g., Yamaha RD 250, Suzuki RG 250, etc.)
Many thanks for helpful answers!
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As a result of the low demand, only the old throttles on 20 and 25 kW available – if anything else is offered.
The real question, however, is:
What are you trying to do?
Yamaha RD 250 -> open 22 kW.
Suzuki RG 250 and GT 250 -> open 22 kW
500s:
Yamaha RD 500 LC -> open 65 kW. There is actually a throttle to 25 kW:
https://www.bc-parts.de/Drossel- auf-25Kw-fuer-Yamaha-RD500LC-47X-84-85
Financially nonsensical – but fun (nix for A2)
Suzuki RG 500 Gamma – open 71 kW and therefore not A2 suitable.
Conclusion
Most 2-stroke 250s will allow you to run unthrottled with A2 anyway.The 500s will hardly be affordable and if more than 70 kW -> nothing more for the A2.
In addition, maintenance susceptibility, possibly problems with spare parts, etc.
I advise you to become a practical everyday companion for the time of A2 with all love for the oldtimers. In the meantime, you can already look for re-established 2-stroke 500s and then run with the acquisition of A without throttle.
Okay, thanks for your answer! Probably the most sensible.
I just searched from curiosity at mobile.de:
https://search.mobile.de/motorrad/yamaha-rdhtml
This goes into the five-digit range. Ouch. 🙁
My tip for you: Search bread and butter from the 1990s to the early 2000s and 4-strokes.
Then, apart from some colour design, you have the classic look and the A2 vehicles with technology, in which you can screw yourself.
What you might like:
However, what the machines have almost all as a problem: they were homologated to 50 hp on sale – i.e. to 37 kW. 2 kW too much for the A2. It’s just…
In my blog, I’ve already let myself out in detail (also to the 72 kW instead of 70 kW):
https://www.600ccm.info/1/161227/A2_New regulation_in_Germany_Ab_heute_gilt_sie#72kw
For the German market, the RD 250 LC with 38 hp was able to use reducing sleeves in the exhaust manifolds and change the carburetor main nozzles to the then economical 27PS/ 20kWhto be throttled.
From 1983 the successor model wasRD 350 YPVSavailable.
The RD 250 LC was set on the German market because a special feature in the insurance classification was omitted:
Since motorcycles with up to 250 cm3 were previously classified into class up to 17 hp / 13 kW, the unthrottled RD 250 LC with 38 hp / 28 kW was the best-selling motorcycle in Germany for a time.
RD 250 LC 4L1 1980–1983 38 HP 247 cm3
RD 350 LC 4L0 1980 49 HP 347 cm3
RD 350 LC 4L0 1981–1983 46 HP 347 cm3
RD 500 LC Power (kW/PS) 65 / 88 Capacity (cm3) 499 should not be raped or cast with a throttle
From 3000/min, the thing is moving. Thanks to membrane inlets and tiny 26 carburetors, the Renner is in a city-friendly manner.
You can bug a RD 500 LC properly peacefully and quietly through the sky.
To this end, a touring, comfortable seating position and even really large mirrors help. Faucets and watches are well-known good Yamaha quality.
The mail goes off when the four roller rotary slides clear the outlet channels.
From 6000/min, the Power-Valves open and let the 500s explode.
The torque rises abruptly, and the RD marches. Starting at 8000/min, it still lays a sash and supplies magnificent two-stroke bite.
Letting a machine throttle is not the problem. However, it is sweet to look at an RD 250 for an original throttle. It came to the market as unthrottled as any other machine, as today’s requirements for step-guide tickets for motorcycles did not exist.
….I always think such questions are best resolved in relevant forums. Google times after, for example, “Yamaha RD-Forum”…. surely gives the hit ….
Okay, thank you for your answer, I’ll look around this one.
The throttles for these types were designed for 34 or even 27hp, but it is difficult to find spare parts in general. This technique is no longer served by many dealers.