Arrow exhaust for NSR

[SGsteve]

I am considering fitting a Arrow exhaust to my NSR and have a few questions.

Does fitting the exhaust require a re-jet. I have read so much conflicting info on this and would like to know for definite, from someone who has fitted the exhaust.

Does fitting this exhaust reduce the over all reliability of the engine?

Many thanks in advance.

My bike is a 2002 NSR125 R2

[ncrn]

In regards to the jetting, yeh you should do it, but that's assuming you've de-restricted the engine at the carb as well.

It shouldn't hurt the engines reliability.
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Past: 55 Sym Jet, 91 ZZR250, 03 NSR125R. Present: 97 ER-5.
https://www.nsr125.co.uk - NSR Owners forum.

[alains]

upjetting is necessary
for having 3 arrow pipe in the past i much prefer the jollymoto which is on mine since 3 years and still in mint condition
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the worst day fishing is better than the best day working

[Rowey]

You'll need to adjust the pilot screw or get a smaller one to richen the idle, move the needle jet up, and new jets.
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ZX6R C6F.
Never argue with an idiot. They'll only bring you down to their level, and beat you with experience.

[alains]

i think you dont know very much on mixture . the pilot screw has no effect over 2000 rpm . the needle has a little effect in the range 2000-7500 (1 notch=1 point of main jet)
the main jet is important in the range 2000-8500 then a power jet add some mixture like the old car carb did with a special pump
standard jetting is (main,idle,power) : 132,38,55 and you need 138,42,65
42 is to ease starts in the morning
positions are here
____________________
the worst day fishing is better than the best day working

[SGsteve]

Thanks for the quick replies, I will look into the Jolly moto exhaust system, what are the best jets to go to in your experience, assuming the carb restrictor has also been removed?

I know that this information is availible, but there are just so many differnet conflicting topics, some saying up-jet some saying that the jetting is already set to full power from the factory, just want to confirm it before going ahead.


Thanks.

[SGsteve]