I recently installed a makoni style carburetor on my bike. But it won't adjust to any of the adjustments. I made with throttle screw, an air fuel mixture screw check for air leaks. No ear leaks was wondering while it'll only run. On choke i have checked Uber and Uber again for air leaks and that's my number one thing I go to you know, I have this problem, but there are no early leaks. Any suggestions.
New carb on my bike will not respond to my adjustments
- Thread starter Yungman
- Start date
Is the fuel tank mounted higher than the carburetor? Did you verify that you have good fuel flow into the carb?
You could open the bowl drain screw and see if plenty of fuel runs out. If you have good flow and no drips when the drain is closed, check your gaskets again. I like to use an UNLIT propane torch, directing a little bit of propane toward the intake area while the engine is running.
Should have asked you this earlier: Was the engine running before you put this carb on? Is the carb new?
You could open the bowl drain screw and see if plenty of fuel runs out. If you have good flow and no drips when the drain is closed, check your gaskets again. I like to use an UNLIT propane torch, directing a little bit of propane toward the intake area while the engine is running.
Should have asked you this earlier: Was the engine running before you put this carb on? Is the carb new?
"Won't adjust" and "It will only run on choke" are symptoms of an air leak. Nothing on the carb will tune when there's an air leak.
If the carb is not cracked there are only two places where it can leak air. Carb to intake and intake to the head. For carbs with a flange most common is carb to intake. The intake must be aligned to the carb before it is bolted to the head. You need to look down the bore of the intake to verify alignment while you tighten the bolts little by little.
Here's a picture looking down the intake that has very good alignment.
If the carb is not cracked there are only two places where it can leak air. Carb to intake and intake to the head. For carbs with a flange most common is carb to intake. The intake must be aligned to the carb before it is bolted to the head. You need to look down the bore of the intake to verify alignment while you tighten the bolts little by little.
Here's a picture looking down the intake that has very good alignment.
Generic Chinese carburetors from Amazon and eBay are a crapshoot. Quality is oftentimes poor and tuning is usually imperfect. First thing is verify no intake air leak and always verify engine valve adjustment is correct. I have boxes of carburetors that were replaced when owners replaced them, only to find out the engine had a tight valve. If you are running only on choke and have no intake air leaks, it indicates engine wants more fuel. Start by increasing pilot jet size and test. Main jet and needle can be adjusted gradually until engine runs without choke when fully warmed.
