Zama Carb Kit For Shc210 For Rbk66b Rbk70 Carb

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Sounds like you either have a hole in the fuel line or the primer bulb valve is leaking and drawing up air instead of drawing the fuel out the tank

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The pressure of the metering diaphragm against the lever over rides the spring pressure on the inlet needle. The fuel pressure from the pump is then great enough to overcome the spring pressure on the inlet needle and fuel flows into the metering chamber.
To arrive at the most appropriate carburetor choice, there`s a basic formula: engine displacement multiplied by maximum rpm divided by 3,456. For example: a typical 355ci small-block—a 0.030-over rebuild—with a 6,000-rpm max engine speed would work well with a 616-cfm carb ((355 x 6,000) 3,456 = 616.32).
To check fuel delivery, remove the fuel line where it enters the carburetor and use a length of rubber hose to direct the flow into bottle or similar container. Fuel should pulse out in strong spurts if your engine is equipped with a mechanical fuel pump (electric fuel pumps are more of a steady stream).
Pop-off pressure:

Rather than pressurizing the carburetor to pop-off, Zama recommends that the carburetor should be pressurized at the fuel fitting to 10 p.s.i. It should hold this pressure for a minimum of 15 seconds.

This method involves looking at the base of the spark plug insulator (white part of the plug) for a slight coloring on the insulator just above where the insulator comes through the steel case. If the mixture is too lean, it will leave no color, while a rich mixture will cause the fuel ring to become more prominent.
Primer bulbs do not work well if there is lots of air and no fuel. I spent over one hour getting my new boat primed. You might try running the hose and bulb to a can of gas (lots of things can go bad with can of gas, be careful) and see if the motor will fill and firm up the bulb.
A primer bulb is important because it helps to fill the carburetor with the correct amount of fuel. You may need to fix or replace your primer bulb if: It is not creating proper suction/pressure.
To provide an adequate fuel/air mixture, gas may be placed directly into the carburetor to prime the engine. Priming carburetors is a dangerous and unnecessary practice and can produce explosion or fire!
Similar to a walk-behind mower, the carb is located below or behind the air filter. You`ll have to remove the filter and the air filter housing to access it. Once you remove the air filter housing, you can identify the carburetor by following the fuel line from the gas tank to the carb.
Once the engine has arrived at operating temperature, go back to the carburetor and adjust the air fuel mixture screw, or screws. Tightening the screw increases the amount of fuel, while loosening decreases the amount of fuel.
Consult your manual first to find the stock size. Also pay attention to the numbers on the side of your old jets, which you`ll be able to see in the steps to come. A larger jet number means a bigger hole and more fuel. A smaller jet number has smaller holes and should be used if your engine needs to run leaner.

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The primer ball will not fill with fuel. – Echo Zama Carb Kit For Shc210 For Rbk66b Rbk70 Carb
ANSWER : Sounds like you either have a hole in the fuel line or the primer bulb valve is leaking and drawing up air instead of drawing the fuel out the tank

Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.

Echo pb-260l won’t rev up under load. like it is missing. changed plug, fuel filter, fuel line, carb. change fuel to meet precise specs. Ideas?
ANSWER : Blown moter from bad gas mixture

Why does the echo start but die when i move from cold start to run?
ANSWER : Fuel issue, carb adjustment, fuel lines, carb rebuild.

Pb 2105 I need to know the fuel to oil mixture for my Echo PB-2105 blower, any ideas?
ANSWER : 50:1

What fuel mix do I use in an ECHO PB413H leaf blower
ANSWER : I have a leaf blower which uses leaded petrol but i would check your user manual and if you dont have one there allways is a copy of it online.

I cannot get gas through the fuel line to the carberator. i tried to push the primer button and it creates pressure in the tank. i have checked the fuel filter and fuel line and they aren’t clogged. can u help with this problem?
ANSWER : Try to look for ON/OFF lever under the gas tank it must have been accidentally turned off.

Will not rev..
ANSWER : If it will not rev up it could be the fuel mixtures on carb. the settings on the carb should be ( left screw should be 1 turn out from being turned all the way in & the right should be 3/4 try that & see what happens let me know [email protected] thanks,wade