What are the symptoms of rich carb settings on a motorcycle?
Rich Reduced Power – It has less power but seems to be OK and runs. Reduced Fuel Mileage – Your using more fuel per cycle so your mileage becomes worse. Rough Idle – Combustion takes a just a bit longer with more fuel and at lower RPM’s the engine can idle rough.
Why does your motorcycle only run on choke?
Fuel goes bad after time, and the first circuit/jet to clog with varnished up fuel is the pilot jet. This circuit delivers fuel for idle, and has the smallest passages found in carburetors.
Is the choke spring part of the carburetor?
Spring: The choke spring can be either integral (a part of the carburetor), such as the design used on the later Rochester Quadrajet, or divorced (not attached to the carburetor), which was common on Chrysler products. When divorced, a linkage connects the spring to the choke plate.
What happens to choke spring tension as engine warms up?
As the engine warms up, the choke spring tension will be reduced; if the accelerator is moved slightly open, the fast-idle cam will drop a notch and move toward curb (warm) idle RPM. You do not want to aggressively throttle the engine to get the fast idle to drop.
What to do if your bike won’t run without a choke?
Normally you would keep it on (closed) until the engine warms up and then turn it off (open). If it really won’t run without the choke being closed/on then it’s not getting enough fuel and the carbs probably need cleaning.
Why does my Virago motorcycle not run without a choke?
I’m trying to figure out what’s wrong with my Virago 250cc. It will only run if you have the choke on. If you let it off the choke the engine switches off. I originally thought that maybe the carbs were dirty. I ran some Seafoam through the fuel system, but it didn’t seem to help.
Why does my Generator only run with the choke on?
A choke is active when it is closed;that is, it is on when it is closed. Normally you would keep it on (closed) until the engine warms up and then turn it off (open). If it really won’t run without the choke being closed/on then it’s not getting enough fuel and the carbs probably need cleaning.
Why does my bike not run on gas?
After years in a dealership seeing bikes with the same problem come in for carb tear downs, some almost every year, because people let the gas dry out in the carbs and the resultant goo sticks in the jets and passage ways, I’m on board with the total carb tear down.
Can a stuck petcock cause a motorcycle to hydrolock?
A stuck float with a standard petcock can create issues as the fuel will do what is stated above but when the bike is sitting. This fuel can also fill the cylinder and create hydrolock and destroy your engine when you start it. The piston cannot get to top dead center on the compression stroke and it bends your connecting rod. This is real.
How to adjust carburetor on off road motorcycle?
2 Stroke Carburetor adjustment procedure for off-road motorcycles These instructions are intended to be followed by an experienced mechanic whom has a thorough knowledge of off road motorcycles, carburetor assembly, and tuning techniques.
How to fix carb jetting at low rpm?
Problems experienced at low RPMs are best corrected by pilot or slow jet replacement. First loosen the float bowl drain bolt and empty the bowl. Be sure that the fuel is going down the OEM drain hoses into the drain pan on the floor. Do not allow the fuel to run down the engine.
How to correct a carb jetting motorcycle backfire?
Start the motorcycle cold with the choke on and see if there are any signs that it is loading up with fuel. Decrease the choke to lessen the fuel. Allow the bike to warm up to riding temperature, about two minutes. How does the bike respond to a standing throttle range? Is it smooth in the low RPM range from idle to about 1200?
What’s the best way to lean CARB on a motorcycle?
Turn the air screw in to richen the mixture. Back the air screw out to lean the mixture. If your airscrew is on airbox side of carb, turning out will lean mixture. If airscrew is on engine side of carb, it will richen it. 1/4 to 3/4 throttle range Raise the needle jet clip to lean the mixture.
Problems experienced at low RPMs are best corrected by pilot or slow jet replacement. First loosen the float bowl drain bolt and empty the bowl. Be sure that the fuel is going down the OEM drain hoses into the drain pan on the floor. Do not allow the fuel to run down the engine.
Start the motorcycle cold with the choke on and see if there are any signs that it is loading up with fuel. Decrease the choke to lessen the fuel. Allow the bike to warm up to riding temperature, about two minutes. How does the bike respond to a standing throttle range? Is it smooth in the low RPM range from idle to about 1200?
How do you change CARB on TTR125 vm24?
Also, for those of you that have the newer model TTR125’s with the two-cable throttle set-up, just use one of those cables with the new VM24 carb and remove or tie up the other one, as it doesn’t use two cables. Just turn the gas on now and fire it up! Adjust the idle screw knob when it’s warmed up and it purrs like a mountain lion.
Where can I buy a Mikuni vm24 carb?
Fortunately, these carburetors are very easy to find and buy. Not only does Mikuni make a lot of them, but you can also find them off of used dirt bikes for cheap. Sudco and eBay are common places to buy them new. You can also get a VM24 off of a 65cc 2-stroke motocross bike, such as a KX65.
Where are the adjustment screws on a carburetor?
Find the adjustment screws on the front of the carburetor. There should be two screws on the front of the carburetor, which are used to adjust the air and fuel mixture. Often these look like flat-head screws and you can use a screwdriver to turn them, adjusting the amount of fuel and air mixing in the carb.
What are the steps in a carb rebuild?
The process is in 6 steps: 1. Bank breakdown 2. Carb breakdown 3. Clean 4. Carb rebuild 5. Bank rebuild 6. Adjustment, testing and troubleshooting Basic Carb Terms The carbs are numbered the same way as the cylinders on the bike – 1 through 4 left to right as you sit on the bike.
What happens when a carburetor is out of adjustment?
When the carburetor is out of adjustment, it means the air/fuel screw and the balance between two or more carburetors need to be adjusted. Incorrect adjustment can produce any of the previously noted symptoms.
How do you adjust the firing order of a cylinder?
With the engine at #1 TDC (firing), you can adjust both valves for the #1 cylinder. Then rotate the crankshaft 120 degrees in the normal direction of rotation (CCW looking at the flywheel end) and you can adjust the valves of the next cylinder in the firing order and so on until you have done them all. I could write this procedure also.
How can I adjust the clearance of my intake valve?
Using a 0.08mm feeler gauge, check the intake valve’s clearance. If there is too little or too much clearance, back off the 10mm nut on top of the rocker and thread the adjuster tappet in until it produces a slight drag on the feeler gauge. Tighten the nut.
Can a valve be adjusted for a 1 cylinder engine?
You have touched on another question that gets asked a lot. Initially adjusting the valve train. With the engine at #1 TDC (firing), you can adjust both valves for the #1 cylinder.
How to adjust intake valve in century performance?
Adjust #1 Intake Valve with #5 cylinder Intake Valve at full valve lift …. Adjust #8 Intake Valve with #7 cylinder Intake Valve at full valve lift …. Adjust #4 Intake Valve with #2 cylinder Intake Valve at full valve lift …. Adjust #3 Intake Valve Exhaust Valve Adjustment: ENGINE OFF!