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Honda NSR125 - Dyno Setup

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html3333
Derestricted Danger



Joined: 19 Feb 2011
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PostPosted: 22:21 - 10 Mar 2011    Post subject: Honda NSR125 - Dyno Setup Reply with quote
Hello there, i'll keep this short and sweet.

I'm going to put a full arrow system on my Honda NSR125 1997 Foxeye. It currently has a 138 main jet.

I know it's going to need rejetting, so i'm going to have it setup on a dyno.

My question is, what range jets will i need to take with me?

Thanks.
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frencho
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Joined: 04 Dec 2010
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PostPosted: 22:39 - 10 Mar 2011    Post subject: Reply with quote
hi the correct jetting for a unrestricted nsr is 138 main 42 idle 65 power
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html3333
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Joined: 19 Feb 2011
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PostPosted: 22:41 - 10 Mar 2011    Post subject: Reply with quote
frencho wrote:
hi the correct jetting for a unrestricted nsr is 138 main 42 idle 65 power


Yes but changing the exhuast will change the mixture.
It will need slightly upjetting....
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frencho
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PostPosted: 22:51 - 10 Mar 2011    Post subject: Reply with quote
best thing to find out first is has the bike been fully unrestricted?the frame number will tell what country bike was made for and what restrictions are on the bike.but one thing is for sure the correct jetting for a unrestricted nsr is as i said 138 main 42 idle 65 power if you have those jets then thats fine
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html3333
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Joined: 19 Feb 2011
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PostPosted: 22:52 - 10 Mar 2011    Post subject: Reply with quote
frencho wrote:
best thing to find out first is has the bike been fully unrestricted?the frame number will tell what country bike was made for and what restrictions are on the bike.but one thing is for sure the correct jetting for a unrestricted nsr is as i said 138 main 42 idle 65 power if you have those jets then thats fine


Refer back to this thread for de-restricting
https://www.bikechatforums.com/viewtopic.php?t=214822&highlight=

I know that changing the exhust will make the engine more rich or lean, and can also create flatspots, and as far as im aware you need to have to jetting spot on to get max power.

I know on my RS50 you did what called Plugchops to determine the jetting, im sure the same applys here.
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frencho
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PostPosted: 23:10 - 10 Mar 2011    Post subject: Reply with quote
right ok.as said looks like its unrestricted apart from exhaust then.i take it the power valve is working ?but as i keep saying if you have the jets i said they are the unrestricted jets which you need if you fit an arrow exhaust or derestrict the standard exhaust.you also need to set the needle in the carb second notch from the top
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lozza
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Joined: 23 Sep 2010
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PostPosted: 16:49 - 11 Mar 2011    Post subject: Reply with quote
yeah its pretty much common opinion among nsr riders that 138 is the jet size for a fully derestricted bike.
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html3333
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PostPosted: 12:16 - 12 Mar 2011    Post subject: Reply with quote
Laurencem wrote:
yeah its pretty much common opinion among nsr riders that 138 is the jet size for a fully derestricted bike.


I respect that. That 138 mainjet is for an NSR125 that has the Inlet mainfold restriction removed, the exhuast restriction and all eletronic restrictions at full power (Power value and ECU)

Mine are all the same as above. But altering either the Intake (air filter) or outlet (exhust) WILL change the mixture.

It might not be a lot, but it will defintally need changing, especialy to get full power.

So my question still stands. What size mainjet will i want? Chances are it'll be about 10% bigger, do remember im having it dyno'd up.
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lozza
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Joined: 23 Sep 2010
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PostPosted: 15:58 - 12 Mar 2011    Post subject: Reply with quote
try going to www.125ccsportsbikes.com and PMing a member called asaniard.

i think hes on this forum but im not sure what his user name is...
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frencho
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PostPosted: 23:33 - 12 Mar 2011    Post subject: Reply with quote
just look on dellorto.co.uk and put in honda nsr phbh jet upgrade kit and that will show you the jets needed which are what i keep saying.they are the ones alains told me to get for mine.cost you about £15 delivered
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Hadies
Borekit Bruiser



Joined: 05 May 2008
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PostPosted: 13:56 - 13 Mar 2011    Post subject: Reply with quote
If you already have the jets frencho has told you to put in on a unrestricted bike with a standard exhaust then it's likely to be running a bit rich. Putting an arrow would lean this out to an ideal point.
Sometimes a derestricted NSR running the standard exhaust doesn't need up jetting.
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