Can somebody please help me with my bogging scooter?

[groundloosers]

I just purchased a wolf wx90 50cc scooter and converted it to an 80mm big bore kit with a 150cc carb, open air filter and racing CDI. I'm having trouble with it sputtering during WOT( see YouTube video link, I have not messed with anything on the carb since I put the 150cc one on, when I open the float bowl I noticed it had a 103 main jet while my other stock car was running a 75 main jet. The scooter seems to do well taking off but when it goes to wide open throttle it tends to bog down. I am currently at a loss here and do not know what to do any help would be gladly be helpful to me, I also checked the fuel filter as well took some of the gas out in and it is yellow in color, here is the video of me at WOT. Valves are set at .004 for intake and .005 for exaust.

youtu.be/0Vpohi4tOwE

[tortoise2]

Speculating insufficient air flow through 150cc carb throttle bore to properly raise slide assembly. Try an 85 jet in original carb.

[groundloosers]

Sept 15, 2019 15:56:26 GMT -5 tortoise2 said:

Speculating insufficient air flow through 150cc carb throttle bore to properly raise slide assembly. Try an 85 jet in original carb.

With or without the aftermarket filter

[90GTVert]

Get a jet kit and try some jets larger than the 103. Also, make sure the float height is set properly. Sounds like it's running lean to me. Alternatively, try jetting the stock carb as tortoise said.

[groundloosers]

I plan on keeping the uni filter on and have some 105-130 jets on the way. With your history with bbk and carberators what is the general size jet that i should aim for, I know there are several factors involved

[benhonda]

I had a 50cc bike with stock carb, cone air filter and high flow exhaust. It would idle and be fine until I went WOT and then bog bad. In your video, the revs were bouncing...were you letting off the throttle when it bogged down and then opening the throttle again?
If so, then it is definately going lean at WOT. My bike had a stock carb, but the high flow intake and exhaust required a 110 main jet (up from the stock 75) and I would think that your larger diameter 150cc carb could allow even more air...so you may need a jet even bigger than 110.
While waiting for the new jet kit, you can see if the needle can be raised to allow more fuel.

[groundloosers]

My new 150cc carb needle can be raised in my video is me at constant WOT

[dexameth]

So I run a similar setup, but a 52mm bore with a 44mm stroker (93.4cc exact) and I use a stock GY6 carb and intake with a open screen "velocity stack" (no foam filter).

Stock jetting is PERFECT at 102/35 (although I feel I'm like 1 or 2 sizes rich, the plug looks great).
I'm at sea-level in Florida.

Your video totally sounded like a lean out at WOT, just like my stock 49cc did from the factory. You should upjet the main a couple sizes at a time (105, 107, 110) doing a ride on each jet to see the change. Move that needle clip all the way to the bottom, then work your way up from there. If you get too rich it'll kinda sputter and hiccup on itself, too lean and it will hang on idle or act erratic like your video.

[groundloosers]

Sept 16, 2019 14:14:37 GMT -5 dexameth said:

So I run a similar setup, but a 52mm bore with a 44mm stroker (93.4cc exact) and I use a stock GY6 carb and intake with a open screen "velocity stack" (no foam filter).

Stock jetting is PERFECT at 102/35 (although I feel I'm like 1 or 2 sizes rich, the plug looks great).
I'm at sea-level in Florida.

Your video totally sounded like a lean out at WOT, just like my stock 49cc did from the factory. You should upjet the main a couple sizes at a time (105, 107, 110) doing a ride on each jet to see the change. Move that needle clip all the way to the bottom, then work your way up from there. If you get too rich it'll kinda sputter and hiccup on itself, too lean and it will hang on idle or act erratic like your video.

Ok my jet kit came in the mail, it came with various sizes the size 100 jet seem to work the best out of all of them however it's still sputtered alittle at mid to full throttle. Could adjusting the needle correct this?

[dexameth]

Sept 17, 2019 19:57:50 GMT -5 groundloosers said:

Sept 16, 2019 14:14:37 GMT -5 dexameth said:

So I run a similar setup, but a 52mm bore with a 44mm stroker (93.4cc exact) and I use a stock GY6 carb and intake with a open screen "velocity stack" (no foam filter).

Stock jetting is PERFECT at 102/35 (although I feel I'm like 1 or 2 sizes rich, the plug looks great).
I'm at sea-level in Florida.

Your video totally sounded like a lean out at WOT, just like my stock 49cc did from the factory. You should upjet the main a couple sizes at a time (105, 107, 110) doing a ride on each jet to see the change. Move that needle clip all the way to the bottom, then work your way up from there. If you get too rich it'll kinda sputter and hiccup on itself, too lean and it will hang on idle or act erratic like your video.

Ok my jet kit came in the mail, it came with various sizes the size 100 jet seem to work the best out of all of them however it's still sputtered alittle at mid to full throttle. Could adjusting the needle correct this?

Yup! Try moving the clip up to the top notch and you should be almost perfect.

[groundloosers]

I'll give it a try tomorrow so by top you mean the leanest setting on the needle?

[GrumpyUnk]

My uneducated opinion is that you have too much carb, and are not really getting into the proper system with the velocity of the airflow you are pulling through the venturi. You can fiddle all you want, but you have a large carb feeding a small engine. Only at the highest demand does the carb come close to fitting the demand. IMO. Definitely worth the cost of admission.
I suggest going back to a smaller size, and picking jets that have worked in that size, say a 19-20mm version.

The Wolf is actually a GMW that has been renamed because of Gorilla Glue. (TM stuff) Nice machine, a step up from a lot, and it should LOVE being a 47mm bore. If you are not too large, it will come close to the high 40mph range with even a small carb installed. I would go back to a smaller, but it's your machine.
tom

[groundloosers]

Sept 17, 2019 22:29:28 GMT -5 GrumpyUnk said:

My uneducated opinion is that you have too much carb, and are not really getting into the proper system with the velocity of the airflow you are pulling through the venturi. You can fiddle all you want, but you have a large carb feeding a small engine. Only at the highest demand does the carb come close to fitting the demand. IMO. Definitely worth the cost of admission.
I suggest going back to a smaller size, and picking jets that have worked in that size, say a 19-20mm version.

The Wolf is actually a GMW that has been renamed because of Gorilla Glue. (TM stuff) Nice machine, a step up from a lot, and it should LOVE being a 47mm bore. If you are not too large, it will come close to the high 40mph range with even a small carb installed. I would go back to a smaller, but it's your machine.
tom

Thanks for the advice tom, if I have two carberators, if the 150cc one does not work i will put the stock one back on, jm still keeping the uni filter though.

[GrumpyUnk]

If you poke around on c-list, you might find ads for a company looking for distributors for ZNEN and Jonway. ZNEN is the Wolf/GMW manufacturer, FWIW. Jonway makes Taotao competitors, and may be a bit better screwed together.
They want distributors in other cities, having warehouses in Los Angeles and Jacksonville.

The stock carb should work fine, though you might want to go up a bit in jet size. I cannot remember what I put into the one I had, but did put a 20mm Keihin from China(likely a not-quite-exactly-proper) that did work well. I don't remember if I left the installed jets, but think so. It had so much power that a belt that had worked fine slipped so much I was in the 8-8500rpm range very quickly. A new belt and a bit larger sliders brought that down so it could use the power rather than slipping the belt.
Guy I sold it to, about 150lb, blew up the clutch/torque drive going slightly downhill at about 50mph. Too fast for me.
tom
tom