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2014 300 exc jetting.

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#1 ·
Hello.

a few postings on here about setting up the 300.

big thanks to all of those that have given up info and answered my newbie smoker questions.

tonight I tried 38, 165, NECJ needle (suzuki rm 250) #3, out 1 1/2 on the air screw and it has made my 300 a) ride like a trial bike, b) cruise on a steady throttle at 50-60 mph, c) pull like a train through the gears, d) give my plug a nice colour all the way through the throttle.

well pleased is an understatement.

anyone that is struggling with a 300 should try this. the jets should come with the bike and the needle can be obtained from g.h m/cycles on 01206 791155 for £16 (inc. p+p) next day delivery.

Thanks again to everyone for their input on this subject and Mr C for the spec.

:scooter:

http://www.ktmforum.co.uk/off-road-enduro/328665-2014-exc-300-a-3.html
 
#2 ·
shipdamite said:
Hello.

a few postings on here about setting up the 300.

big thanks to all of those that have given up info and answered my newbie smoker questions.

tonight I tried Mr C's set up - 38, 165, NECJ needle (suzuki rm 250) #3, out 1 1/2 on the air screw and it has made my 300 a) ride like a trial bike, b) cruise on a steady throttle at 50-60 mph, c) pull like a train through the gears, d) give my plug a nice colour all the way through the throttle.

well pleased is an understatement.

anyone that is struggling with a 300 should try this. the jets should come with the bike and the needle can be obtained from g.h m/cycles on 01206 791155 for £16 (inc. p+p) next day delivery.

Thanks again to everyone for their input on this subject and Mr C for the spec.

:scooter:

http://www.ktmforum.co.uk/off-road-enduro/328665-2014-exc-300-a-3.html
Click to expand...
Good work mate! It's great when you get it running how ya want it :D
 
#4 ·
dunno matey, but for the cost of the bits its worth a go. All the research I did certainly pointed at the 38 idle jet being the best all round bet (mainly for allowing more fuel mix in at part throttle , thus helping prevent seizure [lots on usa site 'ktm talk' on this]) and the NECJ needle reference was quoted by lots of people as being the one to go for.

certainly cheaper than the JD kit which is £80.
 
#5 ·
shipdamite said:
Hello.

a few postings on here about setting up the 300.

big thanks to all of those that have given up info and answered my newbie smoker questions.

tonight I tried Mr C's set up - 38, 165, NECJ needle (suzuki rm 250) #3, out 1 1/2 on the air screw and it has made my 300 a) ride like a trial bike, b) cruise on a steady throttle at 50-60 mph, c) pull like a train through the gears, d) give my plug a nice colour all the way through the throttle.

well pleased is an understatement.

anyone that is struggling with a 300 should try this. the jets should come with the bike and the needle can be obtained from g.h m/cycles on 01206 791155 for £16 (inc. p+p) next day delivery.

Thanks again to everyone for their input on this subject and Mr C for the spec.

:scooter:

http://www.ktmforum.co.uk/off-road-enduro/328665-2014-exc-300-a-3.html
Click to expand...
NEDJ is also 1/2 a clip richer - just for reference purposes.
 
#8 ·
yes. played on the bike today (after greasing up all the frame bearings; no grease on swing arm or steering stem from the factory!) and tried riding it like a trials bike ........ very slow, balancing on the spot, tight lock to lock figures of eight etc, then cracking it open ............ through the gears. coming to a stop. trying to make it stall ................ tickover is low, but it wouldnt stall - its like my gas gas.

lots of stuff on ktm talk about the benefits of a 38 jet; whilst it might be 'slightly' rich on this, it helps with getting fuel to the motor (+ oil of course) which has obvious benefits for downhill stuff/coasting.

its a learning curve riding it after years of 4ts though!

I might be paranoid, but the motor sounds very noisy to me - but youtube tells me that they are all like that.
 
#12 ·
There's quite a few of us on 300's now and we all have very similar specs with the jets were currently running 35 pilots at the mo but have all have 38's in the main stays 165 but some have the k needle while i have the L and i mix 60-1
i always see people with spooge pissing out of the back of their pipe and cant believe they persist with it, when jetted correctly you don't need to give this motor big handfuls you just utillise the torque
 
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#13 ·
Yeah, although I run mine slightly different

N8RH needle clip 2
162 main
And 35 pilot

Although mines the 07 model. Av tried the 38 and found it a bit 'too' stuttery at small movement of the throttle.

Although I would love to know what the difference in my needle and the NECJ needle if anyone knows?

I don't get any spooge out the pipe what so ever and run 50:1 mix
 
#14 ·
I was running with the below settings up to last week. Had crisp response, reasonable fuel consumption but still had a tiny bit of throttle bog down below, was sure it could be better so I am eager to try the NECJ setup. It's in the bike now, just need to get a chance to run it.

Old setup:
38 pilot
1.75 air screw
168 main
J needle 4 clip

New setup:
38 pilot
165 main
NECJ needle (suzuki rm 250) #3 clip
1.5 air screw

BTW - I have never had spooge coming out of mine either.
 
#16 ·
with that setup at the w/e, my bike used less petrol than my mates wr 450.

still a bit spoogey - about 1/2 inch worth out the pipe - but this is hopefully left over from the original setup. bike now has 6 hrs on it. will be talking to x-bikes to see if further tweaking is required; I am confident that the set up is ok - I just wanna check with the expert Chris.
 
#15 ·
Go and give it the beans mate and let us know if it's better!
Although I'm sure the newer bikes are meant to run with richer settings than a 2007 model?

Does anyone know or have a chart to put these needle in order (rich to lean) as these are the ones I have...

N8RF
N8RH
N8RW
N3CJ

Cheers
 
#19 ·
I have mate but no info really, can't work out if the lower the letter the richer/leaner the needle, the setup Iv dialed in tho feels awesome, it's just more curiosity than anything.

Iv got a feeling tho the the newer model bikes run better with 'richer' settings than a 07 bike. Ie if I used the same settings as you 14 men would be too rich.....?
 
#26 ·
linky says:

When the main jet is Lean
the engine will experience detonation or "pinging". Exhaust note will be
of a higher, tinier type note. Engine will
over heat easy and can be down on horsepower. A
moderately lean main jet can cause
engine seizures. A severely lean main jet can cause the engine
to burn a piston (whole in top).
 
#27 ·
Yeah, thanks dude. Went from a 165 to a 168 and still had the same result. Only thing that stopped the pinging was needle at clip 4, but then had horrible hesitation and stutter.
Perhaps I think I am at WOT but probably not even close?? Gonna try the Suzi needle and update with my findings.

G
 
#30 ·
Just go 165 35 and the bog will disappear should be clean and crisp
 
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#32 ·
It's a keeper for me, a little richer than what i was running before but it has smoothed the power delivery out making it more manageable on throttle control.
Ran sweet at Haresfield no probs at all apart from the fat old git riding it.

Old
38 pilot
165 main
n2zj needle ( 2 hot 3 colder)
1 3/4 air
50:1
Above is border line lean but ran very well for 2 years and the bikes still going.

New
38 pilot
165 main
Necj needle clip 3 (cold)
1 3/4 air
50:1

Standard pipe on 12 300 exc
 
#33 ·
now my bike has 10 hrs on it, the 38/165/NECJ-3# set up HAS CHANGED A little bit ?! it has become a little bit burbly on 1/8 ish part throttle (when in slow moving deep ruts, that sort of stuff) which is a bit annoying. Today I haver tried the 35 pilot and moving the clip to 2 + 4 - all of which made it worse, so I went back to 38/165/NECJ-3# with a new spark plug - not that I know what I am talking about, but its almost as if it wants to go richer on the pilot, say a 40 - does this sound at all feasible? the set up is spot on still aside from this part throttle thing that has appeared now the bike has some hours on it.
 
#34 ·
Got a 40 pilot in mine with a 170 main been running the L needle on clip 2. Put the necj needle in today, clip 2 have just changed to clip 3 but didn't ride it. Ran better with the L needle. Air screw is 2 3/4 out but with the L needle ran absolutely bang on, tiny bit of burble on first turn of throttle, didn't feel the need to fiddle anymore.

2013 300 with BLhead mod and gnarly front pipe.

Was a 250, put 300 top end on it, had no end of problems when changed so sent it to a dyno place. Prob done at least 80 miles on less than a tank today.

Dyno place said it just ran better with a 40 and 170.

They are all a bit different.
 
#35 ·
165 35 L needle clip 2 or 3 air screw 1.5 + they're all slightly different clean and smooth right from the off
 
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#36 ·
As ozzy said I'm running this setting also as recommended by ozzy and mark, but on clip 3 a tad rich but I'm running 55:1 it's 99% there remember the temps are dropping so I will be expecting it to run leaner and hoping for 100% soon.

Stevie
 
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#37 ·
My idea of a strong motor is torque and any steep difficult hills that you try....... as soon as the back wheel breaks loose its over, with the right jetting these 300's can lug a higher gear making climbs easier and a dab of the clutch can bring it right on the pipe when needed..... and a correctly jetted bike makes for efficient riding and less chassis movement less riding tight
 
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#38 ·
Agree with that one , i've noticed way less effort needed to pull 2nd or 3rd with a bit of clutch no spinning up most hills , jetted 165 / 35 / air screw 1.75 , bl head done , pulls strong , smooth & got a real bark off idle to the exhaust note now , never changed jetting in 18 months for weather / temp differences , no oil or spooge out the rear pipe runs clean @ 60:1 motorex cross power 2t .
 
#39 ·
And the truth shall set you free......there's no ego involved just sound advice

i haven't jet washed my bike in 2.5 months there's no bling involved but its looked after and it rides well
 
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#41 ·
from the stuff I have read (here/ktmtalk/dirtbikeworld/etc) there seems to be literally dozens of settings out there. ok, altitude and temp will all have a bearing, but as we are saying each bike is different. tried mine with the 35 and it makes that 0-1/8th throttle worse than the 38, or sort of extends the brief period of bad running, so my evolving 2t brain is telling me to try a 40 ........... so a 40 is in the post for a try out on friday when i have some shed-time. perhaps the 14's altered cdi (and head?) make it want more fuel? apart from this annoying blip its all good ........ didnt realise that the fueling would change a bit with more time on the motor. also playing about with springs and p.v settings. tried the red with p.v out flush - I put that back in the box after trying it - if i was of more sensitive disposition i might have hit the brown note running that ;-]
 
#52 ·
bit of an update - tried the 40 and it ran worse. put back the 38 and it was much better; seems to be that getting more hrs on the bike and getting used to riding a 2t again is all helping. Tried a mates 2013 bike yesterday that is 'spot on' and mine was (imho) much better and I think that the most of that is down to the NECJ needle. I have also tried the J.D needles, blue and red on every clip setting (but they are not for the 2014 model year [which has different head/cdi etc]) and I can, hand-on-heart, say that the NECJ was much better. I have emailed J.D and told them what I have found and they say that they are working on a kit for the 2014 bikes .................. seems the NECJ is a better bet all round; I will be interested to learn what upgrade J.D will make to better this. For information, J.D recommends the use of 38 and 165 in low altitude situations (162 for higher).
 
#44 ·
Any updates guys

Stevie
 
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