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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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A lot of fault spark plugs...
Hello everyone
I got a 250 2T 2011 EC. And now my problem is that I have a lot of faulty spark plugs. I found our that when I go downhill, after a while makes the spark plug go off. I thought the problem was the jetting. I put on a smaller jet but nothing happen. Same thing...Then I tried to reduce the gas level in the carb. I adjust the float and reduce it enough. Nothing again... What else can I do? Maybe a smaller idle jet? |
#2
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Quote:
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2011 Gasgas EC200, 1966 BSA 350 scrambles, 1972 Montesa cota 247 |
#3
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[QUOTE=dimtsam;142577]. . . I thought the problem was the jetting. I put on a smaller jet but nothing happen. . .. QUOTE]
What jet? The Mainjet? - that operates when full open throttle position. Quote:
So starting at the start. Clean filter, replace if grotty. Read up on jetting threads here, get a good needle/idlejet combo. Use decent correct plugs. Replace plug cap if in doubt (I like the blue NGK marine ones). There is a small chance the coil is a bit crap but do above first. A modified head helps things burn better.
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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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Don't forget the float height. If the fuel level is too high you'll also get excess flooding forwards into the engine (particularly down hill).
Its about putting all the pieces of the puzzle together. The needle is a big piece of that puzzle, but the rest all has to work with it. |
#5
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....and are you using Grade 8 plugs? Grade 9 plugs are very prone to it on low speeds.
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www.endurohp.eng.br Sherco ST300 2015 (Trials) https://www.instagram.com/leocm74/ Brasil! |
#6
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I' tried both 8's and 9's.Same shit
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#7
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You are most likely running rich in whatever section of the throttle you are using the most causing fouling on the plug. Does it clear up after a good burn through the gears?
Use an iridium plug, I killed plugs every 2 rides, I've had my iridium plug in almost 2 years, it got gammy last week when I rebuild my engine and used 25:1 mineral oil for break in, but runs fine once I thrashed the hell out of it. BR8EIX is the part number. Please note, KTM 300EXCs use a heat range of '7' to combat this same issue.
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450 |
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