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Full power NSR 250 MC28


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Gwenb49

 
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Full power NSR 250 MC28

Thu Aug 20, 2020 3:27 pm » Post: #1 » Download Post

Hi,

I am French and I have an NSR MC28, I would like to have full power of my motorcycle.

Currently, I just have the original card. And I only have one card, I am in case of loss.

Where can I find a HRC-030 cards? or alternative? Is it possible to convert the original board to HRC-030?

I know that it is possible to put the counter of an MC21 but if possible I would like to keep the original.

What should be done besides the HRC card on the motorcycle to have full power? (change the carburetion?)

I already have a complete Tyga exhaust line.

I am sorry for my english.

Thank you for you help.

Best regards.

Gwénaël
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Andy
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Thu Aug 20, 2020 5:38 pm » Post: #2 » Download Post

Bonjour Gwénaël, bienvenue à NSR-WORLD!

There are a few things you can do to bump the power of the MC28 a little, but really, the only true way is with the HRC card. In our experience, the difference between a "delimited" MC28 without an HRC card, and one with a card, can be as much as 10hp!

Your card can be re-programmed, but you need to send your card and PGM-IV to Japan to have it done. Currently a company called KONTEC are the only reliable company to offer the service. You will be able to find them via Google.

I have heard people claim 55+hp using MC21 parts on an MC28, but the few bikes we have dyno tested have struggled to get much over 50rwhp.
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newtoMC21

 
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Thu Aug 20, 2020 6:37 pm » Post: #3 » Download Post

Try these guys method

http://tyga-performance.com/index.php?view=all&cPath=369_501
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Andy
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Fri Aug 21, 2020 2:18 am » Post: #4 » Download Post

We've dyno'd MC28s with similar spec, and on the same dyno that we've tested dozens of other NSRs on, in literally hundreds of configurations, the best we ever saw was around 55hp. (Usually closer to 53hp.)

The best "delimited" MC28 with and HRC card/jet kit/race pipes etc. (i.e. bolt-on upgrades) was 63hp. Any MC28 without the HRC card has always been 8-10hp down.
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Gwenb49

 
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Fri Aug 21, 2020 5:05 pm » Post: #5 » Download Post

Hi,
Thank you very much for your answers.
Clearly I am thinking of looking for a hrc 030 card. With my tyga line,
That should be enough, right?
Best regards
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Andy
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Fri Aug 21, 2020 9:17 pm » Post: #6 » Download Post

In my experience, you really should use the HRC (or equivalent) jet kit, to get the most out of the modifications. It's extremely difficult to jet them and produce good power with a standard airbox, and almost impossible to get the NSR to carburet cleanly without the adjustable needles and HRC air correction parts.

As the genuine HRC kit is virtually impossible to find now, I would suggest a jet kit from T2Racing in Japan. I expect, although cannot guarantee, T2Racing could both supply you with a jet kit, and arrange re-coding of your PGM-IV & card. Definitely worth asking.
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Gwenb49

 
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Sat Aug 22, 2020 7:35 am » Post: #7 » Download Post

Thanks Andy,

If I synthesize everything, I need HRC P-030 card and Jet Kit HRC (or equivalent).

Do you need other parts? Or is it good with these parts?

it is also necessary to change the air box?
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Andy
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Sat Aug 22, 2020 4:39 pm » Post: #8 » Download Post

We often modify the NSR airbox, but given how expensive and difficult to find standard MC28 parts are becoming, I would suggest pod filters, as long as you don't mind the increased noise. (The bark from the carbs can be almost as noisy as the sound from the exhaust silencers!)

Open carbs give the most peak power, a [modified] airbox gives the best mid-range and the least noise, but also the least peak power, and foam pod filters are a great balance between the two. Almost as much peak power as open carbs, but with some dust & dirt filtration.
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