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New NSR250 MC21 Owner needs help


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R1ck

 
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Joined: 03 Feb 2008

Location: Renton, WA
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New NSR250 MC21 Owner needs help

Sun May 04, 2008 1:55 am » Post: #1 » Download Post

Hi Everyone,

I recently purchased a 1990 MC21 in pieces so am rebuilding it since I have to re-assemble it anyways. What I am currently working on is rebuilding the engine. I have most of the parts now and need to fix some unexpected things. Crying or Very sad

When I pulled the cylinders off I discovered that it had been running real lean and now am sending them in to get stripped, replated and diamond honed. The person I purchased the bike from put Tyga side by side pipes and silencers on it but did not re-jet the carbs, thus running lean.

I am very familiar with 2 strokes since I he ridden dirtbikes for years.

Can anyone advise me as to what jetting to run? I have read 150 mains and 45 slow jet but I will be running on the street and with the oil pump with HRC reed stuffers and Carbon fiber reeds.

Thanks
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Dave Ett
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Location: Gloucestershire, England
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Sun May 04, 2008 5:28 am » Post: #2 » Download Post

We don't really advise on jetting as it can be so differnet for every bike in every country. And if you follow advice and go BANG! the person giving it tends to get blamed.

The best advice is to get a selection of jets, and plug chop until you find a setup which works for your bike and climate. If you have access and can afford it, then a dyno is a great time saver. You might want to invest in the HRC jet kit and make a few mods to unlease the (not very well) hidden extra power since you already have after market pipes.

It's a shame not to, after all 60hp is within your grasp and it's free to do! Wink
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Triumph 9551 Daytona Big boys toy
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