racer38 wrote:
Holy moly........ is that the rad HRC use when racing the RS250 across the Sahara

Power = heat... when you can generate well over 100hp from 250cc (without a turbo!) you're going to need to keep it cool somehow!!

However, 70+hp NSR's will run quite sufficiently on OEM rads if the bodywork/ducting is correct, although you do need to keep the bike moving to generate airflow across the matrix; the F3 rads have a thicker (twin) core, but more often than not need taping up to retain temperature. RS rads are generally triple-core.

The HARC Pro ramair kit I have simply uses the OEM radiator and two small "drop-plates" to swing the top of the rad down and out about 20mm. I think Dan posted some pictures of his similar setup here before. RS rads on the NSR are overkill, but do look the business. Even on RS's they often need taping up as the systems are just too efficient. If you're running 40+ degrees AAT though, with massive humidity (like the tropics for example), then a big rad is certainly helpful. What are the general temps you encounter like in South Africa?

Remember, an RS rad is already substantially bigger (deeper, wider, and thicker!) than an NSR rad -- then to move or modify it to get a scoop past it is just yet more hassle! If you can use the HARC Pro (and Jha) approach and just drop the OEM rad down and forward then it's got to be worth trying first in my opinion. StephenRC45's F-III ran a modified OEM rad for quite some time before he was able to find the correct HRC item, and that never suffered cooling issues. There aren't many NSR's about that match his motors output! I even seem to recall Martin77's 350YPVS powered NSR only runs a stock rad too, and that was knocking on the door of 70hp too! (Although only briefly before the crank protested and went on strike! )

An RS rad will likely cost you in the region of £400, and a custom one probably 50% more on top of that... there's a lot you can do with £600 if you're happy for now with the cooling performance of an OEM rad!
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Andy.
NSR-WORLD.COM

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