Jetting a NS125R for a Arrows Pipe

clemsta · Scooby Slapper Joined: 29 Apr 2004 Karma :

I'm about to de-restrict my bike, i have been able to get a cheap second hand arrows system, i have been told that i need to re-jet the bike, what size of jet should i use, how many jets are there that need to be replaced, can i buy a kit and if so where from and how much. Laughing

Thanks for your help. Thumbs Up

hollamat · Two Stroke Sniffer Joined: 20 Feb 2004 Karma :

Hi

try www.dellorto.com main jets are £2.95 each.

They may also be able to give you advice on jets sizes!

clemsta · Scooby Slapper Joined: 29 Apr 2004 Karma :

I've had a look bu it doesn't mention my bike, i e-mailed them anyway. Has anyone else got any suggestions

bikedudextrm · Traffic Copper Joined: 16 Oct 2003 Karma :

Just see what size main jet is in your bike at the moment, fit the exhaust and up jet a couple sizes, see how it runs and check the condition of the plug and up jet more if necessary until it's runs correct.
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clemsta · Scooby Slapper Joined: 29 Apr 2004 Karma :

Thanks for the info, i've been told that the standard jet size is 110, is it just the main jet that you change, has anyone done what i am about to do?
What did you do? Razz

ts50x0 · Spanner Monkey Joined: 16 May 2004 Karma :

i havre not done an nsr but on my 50 when i put on a racing exhaust i put one in that was one size bigger. that is just the ,mamin jet and it was perfect so just up the main jet size by a bit and check the plug each time. in the haynes manuals they show you what to look for in a plug and if its runing too hot, cold ect......
hope that helps Thumbs Up

clemsta · Scooby Slapper Joined: 29 Apr 2004 Karma :

ok thanks, the exhaust was damaged when it arrived so i sent it back, i was thinking about derestricting the standard pipe instead. I only need the bike until the end of the year, then i will be getting a 400 if i pass my test

nsr125sp · Renault 5 Driver Joined: 05 Oct 2003 Karma :

Hello i have just fitted a new arrow system to my nsr, the standard jet size is 135 and believe it or not i had to lean it off as it was too rich, i have gone down to a 130 in stages which has made it better, aprrently on some high performance 2 strokes this is needed to get the max performance, check the plug also !!
ollie
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