Question about Troy-Bilt Mtd Troy Bilt TB4218CC 42cc 2 cycle Gas Engine 18" Chain Saw

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Troybilt chainsaw 20'' bar. will only run until primer fuel is burnt. Replaced gas filter, and soaked carb,and installed a carb.kit.Can`t find any vaccum leads, flywheel and key ok .Help thanks

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The idle screw may be turned all the way in on the carb adjuster which should be a very small screw in a 3/16 hole through the plastic cover on the side between the starter rope and the trigger on most saws. Bottom it out and then turn it back 1 and 1/2 turns. Have the saw on a low bench, so you can control it when she starts up - if the revs are too high the chain will spin up which can be dangerous. Now screw the idle down until the chain stops and the motor starts to stall, screw it out a little to get a running idle which will not stall but never starts the chain spinning up. Some have two screws, one for air during idle, the other for the gas during idle. They both should be out about one and a half turns which is industry standard and then you can fine tune from there, but usually only a half turn cw or ccw would be way too much difference from the standard positions.

Posted on Apr 11, 2011

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Posted on Jan 02, 2017

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Hello, I have a sears leaf blower (358.794762) that will not start. It's almost like the primer bypasses the carb


Sounds like your fuel filter is plugged. Bend a hook on a piece of wire and fish the filter out of the fuel tank. Remove the filter and see if you can blow through it. If not replace the filter. Good luck.

Nov 19, 2015 | Garden

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Easy way to install fuel line and primer bulb return line into gas tank


Chainsaw fuel lines enter the gas tank from holes in top of tank. They are sized for a tight fit to prevent leakage. Make it easy on yourself when pushing the line through the tank by cutting a long lengthwise taper cut with razor knife 3 inches or longer to easily feed through that tight hole. Once started you will then have to grab it through the gas cap hole with needle nose pliers, then cut the tapered end flush and add fuel filter. Readjust inside length by pulling from above, then cut to length to upper carb fitting. If connecting to primer bulb a filter is not required and make sure the line goes to fitting on primer bulb marked tank.

on Nov 17, 2015 | Fuel Line & Primer Bulb Repair Kits 2...

1 Answer

I have a CS4518 Earthquake chainsaw that will crank fine when you pump a little gas to the carb, but stops as soon as it burns the gas. I have replaced all fuel lines, primer bulb , cleaned the carb and...


Hi, OK firstly when you pump the primer bulb the primer bulb pulls fuel from the reservoir and pushes it to the carb then after around six to ten pumps the carb chamber is full and the fuel then goes back to the feservoir. Normally if you have a leak on the fuel line you get air in the priming bulb. Next thing is having primed Put the choke on full and pull the engine over a few times untill you hear it fire. Then depress the throttle and put the choke lever back to normal run position and pull the starter a couple of times untill it starts. Thats a pretty fool proff method on all two stroke machines and I have a few. Hope that is of some help.
Steve

Aug 28, 2013 | Garden

1 Answer

Husqvarna k760 will not prime and/or run properly


Get a carb. rebuild kit ,these models have carb.problems and need rebuilding,shop charges 70.00,get kit for 10.00 and diy.

Dec 11, 2012 | Garden

1 Answer

Chainsaw wont stay running


Get a carb. rebuild kit.

Nov 29, 2012 | Husqvarna Garden

1 Answer

Primer bulb does not work


if you have gas in the primer bulb its working. gas is sucked from tank to carb , out return tube to primer bulb and back to the tank from the primer bulb. most likely dirt in carb or hard diaphram not opening needle valve allowing fuel to be sent. carb kits are around 12 bucks . but carbs for troybilts are usually only 20 bucks. I would just replace the whole carb if the case. if the bulb stayed empty I would look for broken fuel line in the tank that holds the fuel filter. they rot and break off within a year or two.

Apr 20, 2012 | Troy-Bilt Mtd Troy Bilt TB4218CC 42cc 2...

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Walbro WT891 carb on a Craftsman chainsaw. Carb is brand new, all fuel lines and fule filter replaced. I prime the carb with the little plunger, chainsaw starts up and runs out of fuel within 30 seconds....


Who connected these hoses? the normal routing for a machine with a primer is like this, the fuel hose from the tank with the filter on the end goes to the carb fuel inlet nozzel ( not to the primer ) nearest to the pump cover ( cover on carb held with one screw ) the pipe from the metering side of the carb connects to the shorter nozzel on the primer bulb ( suction side ), the longer nozzel on the primer ( pressure side ) connects to the pipe going back to the tank, just remember the primer pulls fuel from the carb,into the bulb, and pushes it back into the tank, it is not actually a primer it is a purge. because it is connected this way it is impossible to flood the engine no matter how many times the bulb is pressed.
Let me know if it starts and runs.

Jan 31, 2011 | Poulan Garden

1 Answer

I have a 2250 Poulan. The fuel lines have been removed. Is this the correct routing for the fuel line? Starting at the filter in the tank,will the line go to the bottom of the carb.? Then the line goes out...


Is there a fix for bar oil running out of the saw all the time until the tank is empty?


there is bad oil line repalce it.

Is this the correct routing for the fuel line? Starting at the filter in the tank,will the line go to the bottom of the carb.? Then the line goes out at the top of the carb. to the primer\'s suction side? Then out of the primer to the fuel tank? This route the primer pulls gas through the carb. Does it make any difference which hole in the tank the lines go to?

YES that correct

Dec 29, 2010 | Poulan P3416 16Inch 34cc 2Cycle Gas...

1 Answer

Troybilt TB90BC fuel line schematic? I have replaced fuel lines that degraded with age and am uncerttain about the correct hook to tank, carburetor and primer. A diagram would help


easiest way to tell you is that the primer is there to pull the fuel through the carb. so fuel filter line goes from tank to carb, then from carb to primer and then back to tank as a return. if you forget which is the in line for the carb just hook with gas in a jar and try sucking it out of the jar. put filte rin a jar. and run line to carb , then line out of carb to primer and line back to jar as a return. if it pulls freely and fills the primer bulb your ready to go. if it pulls hard or not at all something is wrong.

Aug 15, 2010 | Troy-Bilt Garden

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