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Re: CARBURATOR PROBLEMS ON A 10 YEAR OLD CHAINSAW
This is as simple as it gets. If the carb is 10 years old and has not been rebuilt in the past 2 or 3 years it will need to be rebuilt or replaced. The average life of the diaphragms is about 2 to 3 years, If your carb has limiters which will only allow the adjustment screws to turn about 1/2 turn, you will likely not get any relief from adjusting the carb. You will have to take the unit to a local dealer for help. Most likely you will need to replace or rebuild the carb. The problem is that you most likely will not have a Homelite dealer in your area. If you can not find help in your area try Southern Supply Co. Their number is 205-833-2525 and they have anything you will need for Homelite products and they will ship anywhere. Ask for Jason.
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If its an old Homelite you should have 3 screw on the carburator.
First bigger screw for adjust idle on the butterfly.
The 2 other for the mixture. One screw is ''L'' for low rpm mixture an other screw is ''H'' for high rpm mixture.
First the idle screw. It should just open a little bit the carburator butterfly.
Second full close both ''L'' and ''H'' screws (turn clockwise).
After open both ''L'' and ''H'' screws 1/2 to 3/4 turn (conterclockwise)
Normally the saw should start. Tune the ''L'' screw to have the motor running at idle if idle is to fast at this point is not important. After motor is running by itself at idle tune the ''H'' screw.
Full throttle tune the ''H'' screw to be able to pass from low rpm to high rpm with no lag.
Than at full throttle open again a little bit the ''H'' screw to make the high rmp mixture more rich.
Becarful if ''H'' screw is not adjust correctly the mixture will be to poor and motor damage can occur.
It may be necessary to re-tune a very little bit the ''L'' screw and idle screw after the correct setting of the ''H'' screw.
If it still not working carburator kit may be needed,
On some newer model there is no adjusting screws in this case see if a carburator kit is available for your model.
Make sure that you are adjusting the idle speed screw, not the idle jet screw (L). If you are adjusting the proper screw, then it is possible that the throttle trigger assembly in the handle has a load of sawdust/dirt that blocks proper return to idle. Take the handle apart carefully, and make notes on how the parts go back together. Check at the carburetor throttle assembly to make sure the throttle arm returns fully to the idle speed screw when the trigger is pulled and released slowly. Check the throttle spring as well to make sure it is undamaged. Hope this helps!
Turn both screws CW to stops (lightly), then back out each CCW 1-1/2 turns. This should get the engine running if it will. If it does not, check the lower diaphragm on the carburetor for hardness or cracking. You appear to be running on prime only--the carburetor doesn't seem to be pumping in fresh fuel. You may need to do a carburetor clean and re-kit. Check the fuel line condition and the fuel filter in the tank for plugging. Make sure the muffler and air cleaner are not plugged. Once you get the engine to continue running, warm the engine up. Open the throttle and adjust the H needle CW--the engine should start to speed up, but still 4-stroking. The proper setting is 4-stroking, but immediately 2-stroke when cutting. Release the throttle and adjust L needle CW so that the engine runs fairly smoothly, yet will allow the engine to 'follow the throttle'. Set idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!
the screws are on the side of the carb very small heads flat screw driver is needed as they have a cover on them it has to fit inside the cover H (high) and L (low) tighten them all the way in tight but not forcing them turn anti clockwize 1 1/4 turns try to start the saw pull the trigger and adjust the H (high) till it runs smooth then let it idle then pull the trigger again saw should rev without loss of revs if it does turn the L (low) small amount either way till it does hope this helps
Try adjusting the idle. The will be a couple adjustment screws, there will be an (H) and (L) you will need to turn the (L) First tighten the sdcrew completely then turn it 1-1/4 turns. This will be a good to start. Then just turn it small amounts until you get it to idle. Also there should be an idle adjustment you can adjust.
you need to locate your muffler and find screws that remove a screen behind a plate you can remove on the muffler or behind the muffler itself
This screen is a spark arrestor screen and needs to be cleaned and put back or some would say discard all together, but i didnt say that.
give it a look see
this may be your problem and maybe not?
if it was you will see a trmendous difference afterwards