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Spark plug condition NSR

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Hadies
Borekit Bruiser



Joined: 05 May 2008
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PostPosted: 18:38 - 24 Jun 2009    Post subject: Spark plug condition NSR Reply with quote
Hi all.
As some of you may know, I recently fitted an arrow exhaust to my NSR125 and Im pretty sure the mech said he'd adjusted fuelling when I had my standard derestricted exhaust on to suit it. I've only covered about 25 miles with my new exhaust on and checked the plug and this is what it looks like. . .
Does this look normal?
Thanks for the opinions
Hadrian
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Timmeh
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Joined: 01 Nov 2006
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PostPosted: 18:42 - 24 Jun 2009    Post subject: Reply with quote
chocolate brown to light grey end like yours is considered normal.

Only thing I'd check is that the electrodes isn't being worn prematurely.

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Blue_SV650S
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Joined: 27 Nov 2008
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PostPosted: 21:08 - 24 Jun 2009    Post subject: Reply with quote
Scroll down the bottom of this:-

https://www.bcchapel.org/pages/0003/pg11.htm

And decide for yourself! Thumbs Up
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Hadies
Borekit Bruiser



Joined: 05 May 2008
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PostPosted: 21:42 - 24 Jun 2009    Post subject: Reply with quote
Cheers chaps.

If I go with what timmeh says then all is well but if I use the link provided by blue SV I reckon my spark plug is closest to the bottom row of pictures indicating lean, hot running and immenent failure Shocked
Im tempted to take it to a garage. Don't know if I can risk an engine siezure. . .
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Blue_SV650S
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Joined: 27 Nov 2008
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PostPosted: 22:50 - 24 Jun 2009    Post subject: Reply with quote
Hadies wrote:
Cheers chaps.

If I go with what timmeh says then all is well but if I use the link provided by blue SV I reckon my spark plug is closest to the bottom row of pictures indicating lean, hot running and immenent failure Shocked
Im tempted to take it to a garage. Don't know if I can risk an engine siezure. . .


Going by the pics, I have to say I think it is looking a little on the lean side for a 2-stroke myself. I'm not sure it is panic lean, but on the leaner side of comfy certainly ...

You have to remember a stroker is susceptible to changes in atmospherics. So what looks like OK ish at one point might be a bit rich or a bit lean with a atmospheric change. For this reason, its better to run a plug that looks slightly rich.

Do you know what jet is stock and what is in there at the mo?

Its not too hard to check what is in there, whip the float bowl off and look at the number written on the main jet and report back!!! Thumbs Up

If it is running a new pipe and stock jet, then you need to do summin about it, if it has been up-jetted already then you might want to choose to leave it be as someone has been in there and presumably put an appropriate jet in there ... (I am a bit confused if you mean your mech put a jet in for your new exhaust even though running a stock on at the time i.e. you told him what you were getting and he up-jetted accordingly - or if he did so for the zorst on there .. in which case you need to do it again for the new arrow ... ).
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Hadies
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Joined: 05 May 2008
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PostPosted: 23:13 - 24 Jun 2009    Post subject: Reply with quote
I think I was running 132,38,55. I bought the following from dellorto and handed them to a garage and told them to fit.

main jet 138
slow jet 42
power jet 65

Alains recommended me the new jetting. I was running the new jetting on the standard derestricted exhaust for a few hundred miles and never really had a problem.
I recently bought a used arrow exhaust system which had been newly painted. After fitting, the paint burnt for a bit and because of the burning paint smell I started getting worried about the engine Confused
I haven't touched the jetting since fitting the new exhaust. Are there other adjustments that need to be made?
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Blue_SV650S
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Joined: 27 Nov 2008
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PostPosted: 23:22 - 24 Jun 2009    Post subject: Reply with quote
Hadies wrote:
I think I was running 132,38,55. I bought the following from dellorto and handed them to a garage and told them to fit.

main jet 138
slow jet 42
power jet 65

Alains recommended me the new jetting. I was running the new jetting on the standard derestricted exhaust for a few hundred miles and never really had a problem.
I recently bought a used arrow exhaust system which had been newly painted. After fitting, the paint burnt for a bit and because of the burning paint smell I started getting worried about the engine Confused
I haven't touched the jetting since fitting the new exhaust. Are there other adjustments that need to be made?


Ok, at least we know what is in there!! Thumbs Up

I think you need to look up the recommended jetting for the new arrow zorst (I have no idea - I'd have to look it up too), its gonna be available somewhere. Unless Alains were informed you intended to fit the arrow shortly, they would only have suggested jetting for a de-restricted stock job, NOT something that would work generically with anything you fitted in the future.

It does sound like you might be under jetted.

You could be fine, but I'd deffo look up the recommended arrow zorst jetting before running the bike again. Better to be safe than sorry with 2 strokes and jetting!! Wink
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Hadies
Borekit Bruiser



Joined: 05 May 2008
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PostPosted: 23:31 - 24 Jun 2009    Post subject: Reply with quote
Cheers for the replies bud.
I just had a quick look at alains NSR file and he recommends 138, 42,65 with a race exhaust which is what I'm running now.
Any other way to make it run richer without having to buy larger jets?
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Blue_SV650S
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Joined: 27 Nov 2008
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PostPosted: 07:20 - 25 Jun 2009    Post subject: Reply with quote
Hadies wrote:
Cheers for the replies bud.
I just had a quick look at alains NSR file and he recommends 138, 42,65 with a race exhaust which is what I'm running now.
Any other way to make it run richer without having to buy larger jets?


Well you could block the airfilter up a bit, but that really is a bodge to be honest. Bodging and mixtures really aren't the way forward.

Each pipe will want its own jetting, I don't think you can just say 'with ace exhaust' and get away with it for ALL race exhausts ... you need to look up the Arrow jetting. Just google it or phone arrow/their importer/stockists {googles} looking at the arrow website, look like B&C are the importer for the UK:-

B&C EXPRESS LTD
Telephone number:
01522 791369

At the end of the day, its up to you, run it as it now and you could well be absolutely fine, or stick a larger main jet in there to give you the confidence you are running on the safer side.

If it were me I'd want to hear what arrow recommend and take it from there Wink
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Mr Hammers
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Joined: 10 Jul 2008
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PostPosted: 11:42 - 25 Jun 2009    Post subject: Reply with quote
Blue_SV650S wrote:
https://www.bcchapel.org/pages/0003/pg11.htm


Any idea what EGT and CHT actually stand for? Can't see anywhere on that page where it says what they are.
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Timmeh
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Joined: 01 Nov 2006
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PostPosted: 13:10 - 25 Jun 2009    Post subject: Reply with quote
EGT = Exhaust Gas Temperature
CHT = Cylinder Head Temperature

Usually more important when talking about aero piston engines that have manual mixture controls. You either lean or richen the mixture to keep the CHT between two points. This all depends on RPM, altitude, and intake air temperature.

On turbine and turboprop engines they are called T4 and T2 respectively.

/useless trivia post
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you
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