|
|
Post by katt on Aug 1, 2018 23:35:13 GMT -5
Whats the difference of getting 20mm carb and jetting up and boring out 18mm to 20mm to improve airflow provided no gaps left around the throttle?
|
|
|
|
Post by katt on Aug 21, 2018 3:56:04 GMT -5
If i put 24mm carb from QMJ157 on 80cc BBK, will i need to use bigger jet than if i use 20mm carb?
In other words will engine consume more air trough 24mm carb or engine will consume only as much air as cylinder sucks in during operation based on cylinder size and RPM?
|
|
|
|
Post by magoconnor on Aug 24, 2018 21:37:02 GMT -5
Has anybody tried the glixal 20mm?
If so did it check out, or was it just another fake?
|
|
ratdog
Scoot Enthusiast
Posts: 342
|
Post by ratdog on Aug 27, 2018 7:09:50 GMT -5
My first thought was to order one from Amazon, as anything that is Amazon prime is returnable, and they pay the return shipping
when you get it, just measure the inside dia of the side that goes toward the engine. If it’s not 20 mm, just send it Bach (free)
The other option would be to go to scrappydog scooters and order one of theirs. Little bit more money but at least you know it’s right.
|
|
|
|
Post by katt on Aug 30, 2018 23:07:07 GMT -5
Does 24mm carb on 150cc has no acceleration pump like 49cc carb?  |
|
|
|
Post by scooterpimp on Sept 2, 2018 16:28:40 GMT -5
Ok...kickin this thread again..Have a supposed 20mm carb on the way..has anyone heard that these 20mm use 5 mm jets & not 4mm jets like the 19 & 18mm carbs??? Supposed to come with 37 pilot & 80 main...should be close for my 47mm bbk & a-9 cam.. (also incoming)
|
|
|
|
Post by dexameth on Sept 13, 2018 12:46:08 GMT -5
Ok...kickin this thread again..Have a supposed 20mm carb on the way..has anyone heard that these 20mm use 5 mm jets & not 4mm jets like the 19 & 18mm carbs??? Supposed to come with 37 pilot & 80 main...should be close for my 47mm bbk & a-9 cam.. (also incoming) Same jets as the 18/19mm carbs. I even sell an OKO 26mm 139QMB carb that is freakin' HUGE and it uses the same small size jets. Where did you get the 20mm from? I sell the true ones, and there's a chance you got it from one of our customers and it will be true. |
|
|
|
Post by scooterpimp on Sept 13, 2018 18:05:15 GMT -5
It was scoots 2 go ebay thing, keihin? Looks legit 20mm.
|
|
|
|
Post by GrumpyUnk on Sept 14, 2018 12:52:33 GMT -5
I have these, two: www.aliexpress.com/item/Keihin-20mm-Big-Bore-Carb-CVK-Keihin-Carburetor-for-Chinese-GY6-50cc-60cc-80cc-100cc-139QMB/32842780358.html They take a while to get to USA. I suspect they are clones, but have no way to tell. I thought them to be of reasonable quality. Using my micrometer, I measure an actual 20mm bore from the butterfly. I did not disassemble, and cannot measure the actual butterfly diameter. but it appears to match the venturi diameter. The vacuum cover has Keihin or engineered in Japan or similar from the injection mold. Keihin is cast into the side where the throttle linkage is attached. There is no serial number(!) which provides the reason for the 'clone' statement. I would say the build quality is definitely better than the OEM carbs, but how much I cannot state. They are a cheap upgrade for someone on limited budget that has more 'wait time' than cash funds. I'd buy again if needed. tom |
|
|
|
Post by V90Performance on Sept 14, 2018 15:11:02 GMT -5
It was scoots 2 go ebay thing, keihin? Looks legit 20mm. Scoots to go is legit. I brought one from them. |
|
|
|
Post by scooterpimp on Sept 14, 2018 16:15:38 GMT -5
Cool , they did advertise as legit 20 mm , thanks for the heads up V 90 performance
|
|
|
|
Post by tocoo on Nov 26, 2018 7:03:12 GMT -5
I have these, two: www.aliexpress.com/item/Keihin-20mm-Big-Bore-Carb-CVK-Keihin-Carburetor-for-Chinese-GY6-50cc-60cc-80cc-100cc-139QMB/32842780358.html They take a while to get to USA. I suspect they are clones, but have no way to tell. I thought them to be of reasonable quality. Using my micrometer, I measure an actual 20mm bore from the butterfly. I did not disassemble, and cannot measure the actual butterfly diameter. but it appears to match the venturi diameter. The vacuum cover has Keihin or engineered in Japan or similar from the injection mold. Keihin is cast into the side where the throttle linkage is attached. There is no serial number(!) which provides the reason for the 'clone' statement. I would say the build quality is definitely better than the OEM carbs, but how much I cannot state. They are a cheap upgrade for someone on limited budget that has more 'wait time' than cash funds. I'd buy again if needed. tom the performance of this carburetor is the same as the pd18j ? |
|
jer
Scoot Member
Posts: 81
Location: Wyoming-Silicon-Genessee Valleys
|
Post by jer on Aug 27, 2019 16:32:28 GMT -5
Geez, it's been over a year and no one had a problem with a 20mm carb purveyor? I was trying to decide whether to take this up with the vendor privately and came to the conclusion that I would be going against the members of this site if I did. So here goes, just facts. FACT 1: Parts for Scooters advertises a 20mm carb. FACT 2: I recently took delivery of their "20mm carb" FACT 3: The carb is only 17mm at on the air intake side. FACT 4: My stock 19mm carb (PD19J) from TaoMotors is actually 18.5mm at its choke point. FACT 5: I did not replace my 18.5mm carb with their 17mm replacement carb. FACT 6: Abraham Lincoln once said (and you can look this up,) If thirty-thousand people call a cow a dog, it doesn't make that cow a dog. FACT 7: I'm so royally wizzed (at myself) over being taken like this that I could start smashing things. FACT 8: If this site would rather I didn't air this issue in public, I will leave quietly if asked (or told.) This is the first time I'm bringing this up so I don't know what they will say about it, but from the standpoint of the way I treat my customers, there isn't a good answer here: Either they knew or they didn't. If they knew, they are a cheat, if they didn't they are incompetent.   |
|
jer
Scoot Member
Posts: 81
Location: Wyoming-Silicon-Genessee Valleys
|
Post by jer on Aug 28, 2019 22:50:43 GMT -5
UH-OH, bonehead error, I originally called out the wrong vendor. That was a terrible mistake and I can't make any excuse for it. It happens that many so-called 20mm carbs have been brought in to be evaluated and the misidentified vendor was one of two that didn't get ordered yet. That order will be placed tomorrow and I hope to give them a vote-of-confidence when their part is finally evaluated. All these other carbs are turning up fake and I'm anxious to find one that measures up.
No one has bothered to bump this thread with any real info for more than a year.
It is Parts-For-Scooters that sold me the fake 20mm carb. It is their part# 151-222 "20mm INTAKE" The pics in the previous post show the size of the air intake throat to be smaller than the 17mm strip of paper used for reference.
|
|
|
|
Post by fugaziiv on Aug 29, 2019 8:57:41 GMT -5
UH-OH, bonehead error, I originally called out the wrong vendor. That was a terrible mistake and I can't make any excuse for it. It happens that many so-called 20mm carbs have been brought in to be evaluated and the misidentified vendor was one of two that didn't get ordered yet. That order will be placed tomorrow and I hope to give them a vote-of-confidence when their part is finally evaluated. All these other carbs are turning up fake and I'm anxious to find one that measures up.
No one has bothered to bump this thread with any real info for more than a year.
It is Parts-For-Scooters that sold me the fake 20mm carb. It is their part# 151-222 "20mm INTAKE" The pics in the previous post show the size of the air intake throat to be smaller than the 17mm strip of paper used for reference. Pretty sure I went over this one already in this thread, or one like it anyway and even pulled our stock over it for a short period of time while I verified the product personally to make sure we were not misleading anyone. I detest when some implies that we are "taking" them. It's not what we do. Long story short, they're a real 20. The venturi on a 20 is oblong and closes to narrower than 20mm because that's how this carb works. Consequently it flows more air than a fully round PD19. You'll see when you get the other ones. For example, a 24mm GY6 carb closes down to about 20.5mm true venturi before opening back up to 24mm. Additionally, you've got my email (as we've emailed each other in the past), so if you've got beef you could have just sent me an email and let us make things right... as we have a reputation of doing. I don't know why this always has to be so messy. Sigh. Anyway, now that you're in the business of burning bridges publicly, may as well slap on that authentic 20mm that we sent you and reap the benefits of the best 20mm carb in the business. Matt |
|
