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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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Cheap Chinese replacement carb.. (review)
Hi all, I have been struggling for weeks with the carb setup on my 2007 EC250... (UK) I have read everything and tried everything...literally!
I managed to improve things but I was beset with inconsistent results and erratic idle and just....well just... not good... Anyway, I decided to buy a PWK 38 from China... despite some misgivings it was a final attempt at resolving the issues. It cost ?28 and arrived within 2 weeks. My first impression was poor as the idle jet broke when I tried to remove it but a small "easy out" removed it and I installed all the genuine Keihin parts that I had bought in an attempt to cure the old carb. So, everything (jets, needle etc) was transferred to the Chinese copy, fitted to the bike, pilot screw out 1.5 turns fuel on, (short prayer)..... starts 1st kick with a fast idle. The idle screw actually works now and turning it out slowed the idle speed and she just sat there with a beautiful steady idle... be still my beating heart . I let it idle as I refitted the seat and took it for a run. Absolute bloody perfection... I am a fussy bugger when it comes to bikes and this little bike felt like it had a new engine. Everything about it is improved. The response is clean and linear throughout the rev range, the idle is perfect, the spooge has all but disappeared and she starts 1st or 2nd prod hot or cold. Needless to say I am delighted! I do wonder what was wrong with my old carb as I had replaced everything that could be replaced except the jet block gasket. I may get some security Torx bits and remove it tomorrow to see if that was a problem but I guess it was just old and worn like me. Anyway, my advice to anyone with an old well worn EC250 with fueling problems is just spend a few quid on a new carb. It will save hours and hours of grief. Happy days.. I just need the weather to improve a bit in the north of England now....
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Retired EC 250 (2007) UK |
#2
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A couple of people have pm'd me for details... this is it... (38mm)
https://www.aliexpress.com/item/3285...6b214c4dl6vmgZ
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Retired EC 250 (2007) UK |
#3
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I removed the jet block and the gasket looks in a poor sate. Some evidence of leakage.
This may have been the issue but not sure... Sent from my LLD-L31 using Tapatalk
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Retired EC 250 (2007) UK |
#4
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The jet block gasket is a known issue in old carbs or ones that have been cleaned by soaking in solvent or had brake parts cleaner used on them. Jets-R-Us has new replacements available.
I'll give you another little tip that I didn't see anyone else post about a PWK carb. Set your float height to 18mm and not the factory setting. It will make dialing in the jetting that much easier and without little weird running issues. A lot of people don't realize how much float height affects the running of the engine.
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WildAzzRacing YouTube channel Trail Riders of Southern AZ club AZ State Parks OHV Ambassador '11 EC250R '98 KDX220 |
#5
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Thanks SS.. good to know.
I have to say 2T carbs are a "black art" but I have enjoyed learning about them. I think my old (2007) carb had a range of issues relating to old age and wear and tear! I am convinced I had some tiny air leaks somewhere which messed everything up. I was even toying with taking the engine apart to check the various seals...glad I didn't because the new carb has resolved all of the issues and it runs as sweet as a nut now.
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Retired EC 250 (2007) UK |
#6
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Quote:
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2003 txt250 Pro 2013 Ossa 280i |
#7
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For giggles look down the brass jet in the block. The needle can wear it oval. Magnification and light help.
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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) |
#8
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Just checked mpg with new carb and about 15% improvement..
Sent from my LLD-L31 using Tapatalk
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Retired EC 250 (2007) UK |
#9
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top row, 5'th column, 38 mm pwk Keihi brand (close!)
second row, 5'th column, 38 mm pwk ZSDTRP brand (they look the same) "add to cart" below. I think you have to pick the picture. I hit "buy now" and it took me to google to log on. interesting. |
#10
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That's what I am doing tried with the PC at home and just now with my phone, guess they don't want my$$$$
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02 EC 200 03 MC 250 88 VT 800 01 TXT 280 |
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