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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


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Old 01-05-2018, 11:29 AM
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ssaulnier ssaulnier is offline
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Default Rich 2007 EC300 Wants #8 Slide

I have been methodically leaning out the jetting on a new to me 2007 EC300.

The bike started out with a CCK needle, #7 slide, 172 main jet and 45 pilot jet. Plug was black and wet. Bike did not need choke to start. Would not idle and would blubber badly until cleaned out on the main jet where it would go from blubbering to picking up the front wheel and screaming.

I cleaned the nasty Ethanol fuel green film out of the carb, mixed fresh 93 octane gas 50:1 Klotz Super-Techniplate, set the float level to start with but that did not help. So I cleaned/polished the float valve seat and installed a new spring loaded needle valve but the bike was still very rich.

I tried all of the normal needles and main jets and pilot jets and set the fuel level in the float bowl a little lower so the bike doesn't drain fuel on the side stand. She finally ended up with a NECF needle with clip in the top position, #8 slide with a notch I cut, 38 pilot jet and 168 main jet. It was about 50 degrees when I tested it last night and it ran relatively clean throughout the rev range.

Compression is good at 165 psi, the reeds are original but are not chipped yet. I wonder if they are a bit weak? There is just enough hours on the bike to wear out the original chain. Sprockets still look good and you can see cross hatching inside the cylinder and not too much piston ring blow by when you remove the expansion chamber and peek in the exhaust port.

This bike seems to like a lot leaner jetting than anything else I have seen listed.

Should I be looking at anything else?

Thanks, Steve
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Old 01-05-2018, 01:28 PM
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Are you confident you have got enough goop out from the emulsion tube and air holes to the tube?
Mine always needs choke to start when cold. Old gas makes it blubber until its proper warm, new gas behaves better.
Reeds will be fine if not damaged. Check filter not clogged up by some crazy oil, but petrol should clean anything use air filter oil.

You haven't somehow got hold of the black cat pipe? I tried one and it was miserable until cut out. Nickel plate one should be just fine.
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Old 01-05-2018, 03:24 PM
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F5, Now that I have reduced the size of the jets, installed #8 slide and suzuki needle it does start nicely with the choke on.

I cleaned the carb twice and removed the emulsion tube too. I also tested for leaks at the jet block like on the You-Tube video Keihin PWK 38 S1) Idle Fix.

I replaced the air filter with a new one, but noticed no difference.

I need to double check the needle that I have in the bike now. I may have mistyped the needle code. I thought I was buying a leaner needle than the one I just pulled off my receipt. Maybe I need to buy a leaner needle. I'll check that tonight.

I'll also list the actual needles I tried. Don't have my notes here at work with me today.

There was a NOVA science show on TV Wednesday night about the Aurora Borealis (Northern Lights) and Aurora Australis (Southern Lights). They visited Southern New Zealand and it really made me want to visit. One day...

Cheers, Steve
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Old 01-05-2018, 03:25 PM
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And yes, I have the nickel plated pipe on the bike.
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Old 01-06-2018, 10:55 PM
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You don't say where you have either your idle screw or your air screw...

How many turns "out" is each of these?

jeff
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Old 01-08-2018, 10:22 AM
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I have the air screw set to 1.5 turns out. If I turn the air screw in more than about 1/2 from closed the engine will die, but I don?t notice much difference in throttle response or idle quality between 1.5 to 3 turns out so I just left it at 1.5 out from seated.

The idle screw is turned in pretty far, but is not bottoming out it?s spring. The engine will idle for 5 to 10 seconds or so before it dies. While riding and hill climbing the engine is responsive and powerful. It will pull up hills down below the idle speed if I hold the throttle slightly open.

I get a little spooge running down the silencer after burning a gallon of fuel and the spark plug is black and there is a little burble in the mid range. So the bike is still rich, but doesn?t load up and comes on the pipe quickly in a very linear fashion.

Since I am using the top clip position on this NECF needle and the bike is still a bit rich I think I should try a NECJ needle to replace the NECF. I think I got mixed up on the needle codes and bought a richer needle than I wanted last time.
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