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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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Float height doesn't make sense??
Hi all
Recently bought a 2004 EC300. I've been trying to get the carburetor set up, I've made big improvements but it's not 100% right yet, I need some help/advice. Carb is as follows... 38mm Keihin PWK38 Main jet 175 Pilot jet 40 Needle top notch (leanest) Air Screw 2.5 Turns out As you can see I've got it set pretty lean compared to most people's settings. From Closed to 3/4 Throttle it's working really well. But it won't pull wide open throttle, feels rich. If I close throttle a bit I can coax it to pull the full open throttle. I suspect the main jet is too big/rich but at 175 it's already smaller than a lot of people are running. Another suspicion I have is that the float height too high. I've read some of the threads and I keep seeing the figure of 16mm quoted as the correct float height, but that just doesn't make sense to my carb. I measured it and it's already at 21mm. I'm sure if I set it to 16mm it would be running even richer and or overflow. Is it possible that I have a different version PWK38? Bearing in mind that it's a 2004 model? Any help/advice greatly appreciated. All the best, Dave. |
#2
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Forgot to say...
Air filter is clean and oiled. I'm running at about altitude 300m (1000 Feet), temperature around 25'C (77'F). Thanks, Dave. |
#3
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Check your silencer packing. I had a clogged silencer and my bike (2011 300) exhibited similar tendencies. I tested the Keihin as well as a Lectron, no difference in symptoms. Swapped out the silencer and problem solved. It's worth a look to see if the silencer is plugged or not.
__________________
Phil (New bike pending...) |
#4
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Yes, good point, I'll check that and report back.
Thanks, Dave. |
#5
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Have you checked the reeds?
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#6
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Results from plug chop...
Reset the float height to the recommended 16mm and went for a ride today.
Bike's running great CLOSED to 3/4 throttle but still won't pull Wide Open Throttle. I felt it was running rich and decided to do a plug chop. To my surprise it looks like it's lean. Currently on a 175 main jet. Definitely looks grey. I've just ordered a 180 Main jet, see how that goes. Yours comments...? |
#7
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Great news!
Congratulations, that's great news!
So Pscook was right... Quote:
By the way, where are you? All the best, Dave. |
#8
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Davehuge, Jakobi thank you very much! Now I'm waiting for a new muffler. Old one have got smaller tube than original.
I'm from Poland. |
#9
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I just printed four copies. For my boss, the wife, my mom, and my garage.
Seriously, I chased my issue for over two years (and several tens of dollars in parts), so I'm glad that you were able to resolve it faster than I was. Now go ride!
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Phil (New bike pending...) |
#10
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Quote:
http://www.allthingsmoto.com/forums/...ght-way-65541/
__________________
2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300 "If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut." ―Comedian Lewis Black "I think best when I have a wrench in my hands." Soichiro Honda "Dreams are messages from the deep." -Unknown Sardaukar |
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