Hay I'm back with good news! I got the same quad and carb and issue. Your running Lean or rich on the video. So that little screw on the bottom of you carb ya turn that all the way in! No not the idle screw it's the flat head brass screw air to fuel mix screw. Then back it out 3 turns start there! Engine needs to be warmed up! If you still get throttle lag backfire turn half turn out each time until problem stops, ounce stopped get on your quad do a load test in third gear if it's lagging power or bogs out keep turning the Air to fuel ratio screw out 1/2 turn out until you get full power under wide open throttle in third gear. Then fine tune your carborator. If engine gets to running hot go 1/4th turn out until engine maintains heat level then go a hair bit rich to protect the engine of heat expansion damage. Your welcome 😁 Ps. As your Tuning your fuel mixture yes you'll half to adjust your idle screw accordingly to correct RPM range. Wish I was there to help you tune the carborator and teach you the trick on how to do it correctly would save you Alot of frustration that I went threw.
Hi. Hope this helps. The carberator in this video appears not set up. For example, you can see the gold screw at the bottom almost completely out of the casing. Therefore, no throttle is even set. That is why when he pushes up on it with his finger it is almost better. That is step one. When you give it throttle and it bogs out on this, or on your brand new one, it most likely is because the balance of air to fuel being transacted in the component is not set up properly yet. Similar to the throttle cable not being set. In the forward part of the carberator, underneath, there is a flathead screw. Check out Utube videos on how to pilot air fuel screw adjustments or tune carberators. After it is tuned you will give perfect throttle, perfect air and fuel balance, and it will run. Taking time to try helping you so also know that the rubber gasket on the mental intake which leads up to the carberator is proprietary design and unlike most other motors Yamaha glued/melted the motor side to the metal intake. Wild. Over time it cracks. Even the smallest crack can allow MORE air into the system and bypasses the carberator, which will cause problems. Also, it could be a gas problem. If it sat for a long time, setiment in the petcock valve from the gas tanks. Looks like this gentleman has no in line fuel filter. Regardless of one in the tank or not I always put an in line fuel filter. There is a slim chance he has no fuel filter at all, because the ones in the tank are problematic and not reliable. So he may have just loaded junk all up into his carberator and that will cause problems too. Have fun and hope this helped.
Wrong jet in that clone. Order a genuine Mikuni 95 main jet. They've sold millions of these carbs as a bear tracker replacement. They're actually using it for another bike as a replacement but they're making money selling it to beartracker owners. There's not currently a carburetor sold that works on the bear Best thing to do is keep your factory Mikuni carburetor. And rebuild it. Next best thing of course would be to replace the jet in the clone carburetor with a Mikuni 95 main jet.
Hay I'm back with good news!
I got the same quad and carb and issue. Your running Lean or rich on the video.
So that little screw on the bottom of you carb ya turn that all the way in!
No not the idle screw it's the flat head brass screw air to fuel mix screw.
Then back it out 3 turns start there!
Engine needs to be warmed up!
If you still get throttle lag backfire turn half turn out each time until problem stops, ounce stopped get on your quad do a load test in third gear if it's lagging power or bogs out keep turning the Air to fuel ratio screw out 1/2 turn out until you get full power under wide open throttle in third gear. Then fine tune your carborator. If engine gets to running hot go 1/4th turn out until engine maintains heat level then go a hair bit rich to protect the engine of heat expansion damage.
Your welcome 😁
Ps. As your Tuning your fuel mixture yes you'll half to adjust your idle screw accordingly to correct RPM range.
Wish I was there to help you tune the carborator and teach you the trick on how to do it correctly would save you Alot of frustration that I went threw.
Thank you. I just ran into this issue today on mine. I’m going to try your method before I pull it all apart.
Make many holes on filter box cover will going right
So what was the issue mine is doing the same thing. And I just put a brand new carb on it
Hi. Hope this helps. The carberator in this video appears not set up. For example, you can see the gold screw at the bottom almost completely out of the casing. Therefore, no throttle is even set. That is why when he pushes up on it with his finger it is almost better. That is step one. When you give it throttle and it bogs out on this, or on your brand new one, it most likely is because the balance of air to fuel being transacted in the component is not set up properly yet. Similar to the throttle cable not being set. In the forward part of the carberator, underneath, there is a flathead screw. Check out Utube videos on how to pilot air fuel screw adjustments or tune carberators. After it is tuned you will give perfect throttle, perfect air and fuel balance, and it will run. Taking time to try helping you so also know that the rubber gasket on the mental intake which leads up to the carberator is proprietary design and unlike most other motors Yamaha glued/melted the motor side to the metal intake. Wild. Over time it cracks. Even the smallest crack can allow MORE air into the system and bypasses the carberator, which will cause problems. Also, it could be a gas problem. If it sat for a long time, setiment in the petcock valve from the gas tanks. Looks like this gentleman has no in line fuel filter. Regardless of one in the tank or not I always put an in line fuel filter. There is a slim chance he has no fuel filter at all, because the ones in the tank are problematic and not reliable. So he may have just loaded junk all up into his carberator and that will cause problems too. Have fun and hope this helped.
These won’t run right at all with the air filter box cover off. Running too lean
Idol screen
Idol screw
American Idol?
Wrong jet in that clone.
Order a genuine Mikuni 95 main jet.
They've sold millions of these carbs as a bear tracker replacement.
They're actually using it for another bike as a replacement but they're making money selling it to beartracker owners. There's not currently a carburetor sold that works on the bear
Best thing to do is keep your factory Mikuni carburetor. And rebuild it.
Next best thing of course would be to replace the jet in the clone carburetor with a Mikuni 95 main jet.