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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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Main jet question ( N3CH)
Recently I returned from ktm to GG
So,my ec 300 2010 is in very good shape. My carb specs are: Carb 38 asll 42p N3CH#3 172 main. I didn't ride the bike yet ,only around the house. bike start ok,idle ok. Revs clean but seams to stop reving 100%. 85% maybe . Is 172 main ok for this needle? Last edited by adriano.ro; 06-22-2019 at 11:04 PM. |
#2
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175 would be my choice.
250m-1200m elevation is the altitude I ride. This combination worked well on both my 2010 and 2015 ec300’s with both bikes squish measuring up at a loose 2.1mm.
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2011 TXT300R 2018 EC300GP Last edited by Nocams; 06-24-2019 at 02:51 AM. |
#3
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Just try it a size smaller and see if it is better or worse. Your bike with your oil ratio with your local gas and altitude etc. . .
Mine needed a 170 to rev out cleanly.
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
#4
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98 RON gas, 300-1200m alt. , temp around 25C, oil ratio 50:1.
I don't know if is a good thing or a bad thing, but when I bought the bike start soooo easy,I mean u can kick very easy to start it,was Ipone oil premix. So after I put in BELRAY SI7 ,compression was higher! |
#5
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I'd try the 170 main jet first...
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#6
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Update.
42 N3CH#3 170 and 172 is lean on pilot. 42 N3CJ is lean in every clip position. 42 N8RJ#3 170 this needle is got the best top end power 42p NECW#3 170 is the best what I can do for now. But I don't like how the bike work,I don't know if the jetting is the only issue but this bike has no power on midle throttle. I also tried NECW#4 ,more power but to rich on needle. Is strqnge how it feels,is kind of flet power,and the engine sound ia more pronounced in air box area. Is like power valve issue but is all good there. Very weak after 3 years of ktm.. I like so much the bike,but the power is weak, is like 250.. Other mods, ignition timming to be more snappy, I took off reed valve spacer, 13-50 gear ratio,0.35mm cylinder base gasket,1.8mm squish. |
#7
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Sort your squish out. Then start again with the jetting.
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Back on a gassy! 2018 EC300! 🤘 Txt 280 07 to make me feel like a gumby again |
#8
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Rings are ok,power valve works ok. I want to check the crank seals, spark plug looks ok,no oil on it,but u never knows.
LHS seal is a little bit wet.I'll change it for peace of mind. |
#9
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Update.
I've changed the cylinder base gasket. From 0.35 to 0.45 and I mill the cyl. head 0.50mm only from o-ring part. I have also checked the power valve resistance,I loss of a bit. I've moved bottom piston ring up,was better than top one. THIS THING RIPS!!!!! HOLLY F@#$ Just a little bit of hesitation from 0.15%-0.30% off throttle. |
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