hi all, just found out this forum!! nice to meet u guys ok just got my nsr150sp 1 mth ago. at 1st if was so slow and no like no power, just did a full service(wash carb, valve and stuff like tat change setting) my bike is better but i want to improve more on my bike performance.. i was told my valve need to change, any recommendation for that? and any1 know where can i still get the keihin 32mm carb? i will get a k&n filter after installing the 32mm carb.. what else still can i mod my bike? i know chamber and pipe... but i would get caught if i install those. im from singapore and police are everywhere. NSR150SP Racing CDI any good from tyga?

what about carbon reeds? what is that? izzit worth getting it?

Have you searched the forum?

I think there have been many replies on tuning the 150, and one quite recently.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Hello "ngky7", and welcome.

Please can you refrain from "shorthand", as there are many foreign users of the forum who's native language is not English.

Examples: "izzit" and "any1".
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NSR-WORLD.COM

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Hi, okay. sorry about that. So any one have any ideas? Where can i still get the Keihin TA22 32mm carburettor? And i was told i need to change my valve.. I also have problem with my rear brake, it was too slow and soft. I was planning to change my disc brake and brake pads. Any recommendation for that too?

Have you serviced it? I'd imagine a good clean and rebuild with fresh copperslip will improve it's power.

Putting fresh fluid in will doubtless help too, as you don't know when (if ever) it was last changed.

Oh, and read this:

tuning
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

The NSR150SP is sadly a rather underpowered piece of kit in standard trim.

You need a pipe to stand any chance of getting power, but seeing as you're in Singapore you wouldn't get out of the parking lot without losing your bike to the local cop shop!

Basically, there's very little you can do to the 150 to get more power if you don't change the pipe, or at the very least cut it open and throw away the silly cat inside it. While you're there you can shorten the pipe (25~30mm will make a good difference) in the belly section. Then weld it up again and tell any inquisitive copper that you had to cut it open to clean the rust out from inside.

A bigger carb will help. It doesn't add huge amounts of power, but does let it rev out more freely, so it won't feel so strangled by the ridiculously small 26mm carbytooter. 32mm is a good start, or if you're feeling a little more rich you could opt for a PJ or a PWK and go bigger.

Don't go too big on the carb though unless you're going to open the engine up and start porting and modifying the crank cases, as the ports and intake are designed for bottom/mid range power. Hence the tiny carb as standard.

You can get up to around 30hp without too much trouble. More than that requires porting. They can get over 40hp if you've got the time and money!

Thanks for all the replies. I know about the cutting it open and throw away the silly cat inside it, the sound will be very very very sharp and loud right? Alot of people did that in Singapore but it's obvious to let Police to hear it. I need something more silent than the sharp and loud sound. At least the power is there, so i can don't change my carburettor. Am i right

Here's the choices:

You want power - make it louder and dodge the coppers

You want it quiet - keep it stock and wave to the coppers.

what about spocket? orginal is 520 with 39 or 40? with front gear 15? whats the best choice for that? my friend is using 428 with 14 and 38. Does it makes any different? I know my pick up is faster only than him. right?