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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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Detonation on deceleration
Is about ktm exc 250 2011
Jetting: 38p n8rw@3 168 main jet. ( even with 172 or 175 will make same pimping in deceleration from with) Temp 5C elv 500m |
#2
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With n8rj and 38 168 is ok but too soft on bottom end.
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#3
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So after riding 100000 topics about this problem I find this: too rich on pilot! Is strange but il logic think.
With leaner needle I don't have detonation,so that is. I really want to use W needle. I have 250 and I want more power/snap from bottom. |
#4
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Fuel knock on decel seems common on the ktm. Leaner pilot or slide may help, before you get too lost in the jetting try your original setting using higher octane/race fuel for a more controlled burn.
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15 GASGAS EC 250 19 Sherco SE 125R |
#5
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I've found the best way to reduce fuel knock on decal is by lowering the slide as much as you can. Often if you are willing to sacrifice the idle speed a bit it'll make running much cleaner.
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#6
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Lowering the slide/idle speed helped mine the most even after messing with jetting, needles and slides.
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Noah 2000 EC250 with 2011 transformation kit, KYB SSS forks, MN street title 16' Ski-Doo XS Renegade X 1200 4T 16' Specialized Fatboy trail 02' ZRX 1200r R.I.P. 72' Olds 500ci, Batten Heads, Street/Drag car, former CarCraft magazine centerfold (has-been) 15' TW200 |
#7
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Yes, that is the solution. The good one. I don't have race fuel in our country. The lower number of octane is 95 but I use 99 always.
I have NECJ needle too. But I feel it too soft right from the bottom. Jakob I use your knowledge even with orange machine |
#8
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Update: 42,40,38 pilot jets whit NECJ@3 165 ( with 38 n3cw #3 the same),will make tha same thing: detonation.
So, if with necj and w needles will detonate on decel those needle shave something in comun: rich from bottom. I have N8RW N8RJ N8RG N3CJ N3CW M2ZJ witch one to use for best bottom end? Last edited by adriano.ro; 12-15-2017 at 05:10 AM. |
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