I get spark and fuel. Can it be the air/fuel mixture? How do I set those? Also, any other common problems? It ran fairly well until it set for awhile. I have emptied out and refilled with fresh fuel mixture. Do you know the right spark plug for it? I think my son got the right one,but I don't have the old one to check. Thanks.
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Re: Chainsaw won't start.
Check with an auto parts supplier for the correct spark plug number. Actually, any clean plug that fits the hole will allow the engine to start, but don't start sawing until the right one is installed.Try spraying some starting fluid into the plug hole, install the plug and see if it will pop. If the H and L adjustment screws have been played with--turn both to CW stops (lightly) and back out CCW 1-1/2 turns each. This basic setting should allow the engine to run and accelerate. If this gets it running, warm up the engine, then pull the throttle full on and adjust H for high speed, but 4-stroking. It should smooth out immediately when cutting wood. Release the throttle and adjust L for smooth idle, but rich enough to allow the engine to 'follow the throttle'. Adjust idle speed so that the chain just stops moving.
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A number of reasons for this, poor quaility fuel causing vapour lock, over heating due to starter cover vents blocked,cylinder fins clogged, running too lean on the carb mixture settings, fuel tank breather clogged ( slacken off fuel cap when it starts to die, if it picks up again, replace tank breather, or ignition unit breaking down when hot ( only cure is to replace the unit )
if your plugs are black, the bike is too rich. lean out your mixture screw a little at a time until it seems riight. hard for me to tell you exactly when it's set without me seeing or feeling it myself.
Most likely fuel "Air" problem. Old fuel can and will gunk up the air flow jets. Would suggest cleaning the carb and filters. Then replace with good fuel mixture and start again. :) Make sure the choke is set correctly and the air filters are clean. Had a lawn mower that would NEVER crank correctly after sitting idle for the winter. Had to dis-assembly the carb and clean literally with paper clip and tooth brush. Never once had to change the spark plug or wires. After spring cleaning (LOL) it would usually crank on the 2nd pull.
Most carburetors can be rebuilt and solve most problems, but occasionally the debris is into places where cleaning is not possible, and must be replaced. I would try some basics first though.
Overfuel or 'rich' condition Basics to check:
1) Spark plug - brown or dark brown - OK a) is it carbon or fuel fouled b) is there spark
2) Muffler remove for inspection a) exhaust screen clean or plugged b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
5) Fuel mixture ratio: Make sure the oil mix is per your manufactures recommendations
6) If after the above the engine is still smoking and blubbering: Adjust carb mixture screws to a 'less rich' setting *NOTE: only move mixture screws 1/8 of a turn at a time, and try operation before any more adjustment
Jets in chainsaw may have build-up. A good build-up remover is called SeaFoam. Add this by direction to the gas. When using the SeaFoam you need to run full throttle with intermittently full choke until motor runs smooth with no choke.
Double check 2-cycle mixture. Too lean mixture in the chainsaw wont stay running.
An engine needs three things to run(fuel and air mixed together in the correct proportions,compresion of the fuel/air mixture and ignition).Make carb adjustments,check the compression and the spark from the sparkplug.Priming the engine(put some gas into the sparkplug hole).Try to start the engine.If engine is running only the gas from the cilinder,the chain saw has a fuel delivery problem.Disassembly the carb and clean the inner parts.Check the fuel and air filters,fuel hose and gas tank ventil.