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Post by utidropout on Jan 23, 2017 12:58:08 GMT -5
The Tao Tao ATM stock carborator is extremely sketchy. Mine lost throttle capability at nearly 60KM total on the scooter. I have read that I am not the only person to realize that the stock carborators' are junk.
The real question is why Keihin PD18J/PD19J are rare finds? I could not even find a PD19J GY6 50cc carborator for sale. I bought one of the PD18J GY6 50cc carborators.
How reliable are the Keihin PD18J/PD19J carbs on GY6 50cc engines?
How much new performance is acquired for steep hills adjusting the fuel screw and needle?
Who sells parts for Keihin PD18J/PD19J GY6 50cc carbs?
Any other insights too?
THANKS
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Post by tortoise2 on Jan 23, 2017 13:33:37 GMT -5
The Tao Tao ATM stock carborator is extremely sketchy. Mine lost throttle capability at nearly 60KM total on the scooter. Did you test slide/diaphragm assembly? This vendor offers main jet size options.
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Post by 90GTVert on Jan 23, 2017 15:01:58 GMT -5
Keihin carbs should be good reliable carbs for these scoots.
How much performance you gain on a hill with the needle or mixture screw depends on how you're going up the hill. If you are doing little more than idling up the hill, the mix screw may help. If you are part throttle, the needle could make a big difference. If you have to be heavy on the throttle (3/4 or more) then the main jet will do the most. How much you gain from any tuning mod will depend how far out of tune it started out, so it's hard to answer.
Jets and many parts should work from most of the carbs sold like these. Some parts, like needles, don't just swap in from any carb like it. Check out banners on the forum and PartsForScooters and eBay and amazon.
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Post by kagetenshi on Jan 23, 2017 17:12:45 GMT -5
I have a keihin pd19j on my taotao VIP and it has been the best out of 3 carbs I've had. More power than the 18mm carbs and with a few small washers under the needle it gained some top end and a little more low end grunt.
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Post by kagetenshi on Jan 23, 2017 17:14:05 GMT -5
It sat unused for a year and cleaned up easily. Other than having a few jets to unclog here and there it's been great for 3 years now.
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Post by badpumpkin on Jan 25, 2017 19:34:43 GMT -5
Keihin carburetor from GOOFIT on amazon.
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Post by utidropout on Jan 26, 2017 5:32:14 GMT -5
GOOFIT does not offer PD19J/PD18J GY6 50cc carborators.
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Post by utidropout on Jan 27, 2017 21:50:42 GMT -5
I installed my Keihin PD18J on my Tao Tao ATM. It run's really great. The only issue is I cannot accurately detect a fine mixture RPM change. It is either weak with too much fuel or mild with the least fuel. There is no detectable fine adjustment. My screw was 1.75x unscrewed from the factory.
Any thoughts about your factory unscrewed defaults?
Any thoughts about best screw adjustment that other people found with the Keihin 50cc carbs?
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Post by utidropout on Jan 28, 2017 11:21:48 GMT -5
I tried the Keihin PD18J. The default can do about 15mph up steep hills. The factory Tao Tao ATM GY6 50cc carb can do about close to 12.5mph up steep hills.
HERE IS THE NEED TO KNOW ABOUT KEIHIN CARBS:
1. The install is very easy and fits well.
2. I am unaware of the best idle mixture screw turn count.
3. I do not think it is worth trying to figure out the needle adjustment. I think default is sufficient. The reason is the rubber seal that the black plastic cover sits on MUST fit exact, or the power band for hills will completely disappear. It literally means that I had removed and installed the black cover several times just to obtain the power band back after trying to mess around with needle settings.
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Post by utidropout on Feb 22, 2017 14:04:38 GMT -5
HERE IT IS.... The gas mileage for my Keihin carb PD18J is slightly more than 20mpg. I live on the hill top next to the downtown center. There are other mild hills too.
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Post by kagetenshi on Feb 22, 2017 17:37:18 GMT -5
I'm no expert, but a stock 50cc 4t should get way over 20 MPG. I average at least 80 MPG at WOT for extended periods of time. Something isn't right if you're only getting 20 MPG.
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Post by utidropout on Feb 24, 2017 20:23:29 GMT -5
I think it depends on the mathematical factor. Pushing 330lb on flat ground is seriously different than pushing it up mild and steep hills. The needle is stock setting and the screw is three turns out (two turns was weak).
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Post by kagetenshi on Feb 25, 2017 10:58:22 GMT -5
At WOT an engine will only use so much gas regardless of load. Something I in your engine is almost definitely out of whack. What kind of rpns are you getting when under full load? Remember that a carburetor will only move so much fuel depending on rpms and vacuum pressure.
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Post by utidropout on Feb 27, 2017 23:02:42 GMT -5
The carb is nearly brand new. The only basic factor with gas mileage adjustment on the 50cc is likely the carb. Decent spark plug, and the valves are spec. It could be the Keihins' are not modernized enough. If you look at Kymco, some of their scooters get pathic gas mileage ratings. If I bought another scooter, I would buy the PCX 150 or Metropolitan by Honda -- fuel injected.
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