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Re: throttle control on mccullock chainsaw
There is no service manual for this chain saw. Since chain saws are
such dangerous tools, manufacturers do not want the end user to
attempt any service or repairs beyond what is in the owners manual. If
you are in fact looking for an owners manual you can contact southern
supply company at 205-833-2525 or email them at
firstname.lastname@example.org and I feel sure Jason or someone there
can help you.
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It is always best to take pictures before/during taking anything apart. This makes it so much easier during the reassembly process. I recommend contacting your local authorized service center for assistance.
You may contact the manufacturer, download manuals, check fuel/oil ratios, order parts, find your local service center, and view other resources using these links:
To lock the choke on:- 1. depress dead mans trigget on top of back handle 2. squeeze throttle trigger fully in. 3. slide on switch fully down to 'full choke' position. 'it should stay there'. 4. Pull saw over until it fires once. 5. click 'on' switch up one position to 'half choke' 6. pull saw over again, saw should start running and be revving high. 7. 'blip' throttle, saw should stop revving and run on tick over.
Open the carburetor area cover and remove the air cleaner so that you can observe the throttle arm and the idle speed screw which stops throttle movement to set idle speed. If the throttle arm doesn't come back completely to the screw, then likely, the throttle trigger is jammed with sawdust/dirt that prevents the throttle arm from returning. Disassemble the trigger assembly making notes of part placement as you go. You will usually find a plug of sawdust in the trigger mechanism. Recheck the throttle arm motion after putting the trigger back together. You may have to advance the idle speed screw several turns CW to be able to keep the engine running when the throttle works correctly. Idle speed should be set so that the engine continues to run, but the chain doesn't try to turn. Hope this helps!
Operate the throttle trigger to see if it returns to the idle speed screw when the trigger is released. If it seems to 'float' somewhat, the trigger assembly may be full of dirt/sawdust, or the throttle return spring on the carburetor is damaged or disconnected. When taking the trigger assembly apart, be sure to make notes so that it can be put back together correctly. Make sure the throttle plate in the bore is tight to the shaft. When the carburetor was off of the engine, did the gaskets and heat insulator seem to be ok? Any air leak behind the carburetor will cause run-away speed. As for the engine quitting, check the fuel filter, air cleaner, and muffler for plugging. Check the condition of all of the fuel lines for decay or other damage. Did you check the condition of the diaphragm in the lower chamber of the carburetor--it should be quite flexible with no holes or cracks. With the jetting set where you have it, the engine should be 4-stroking heavily. Hope this helps!
Remove the air cleaner and watch the throttle arm on the carburetor while operating the throttle trigger--suspect that the trigger assembly has acquired sawdust and dirt sufficient to limit proper travel of the trigger mechanism. Careful notes as you dis-assemble the trigger will help get it back together properly. There is little except proper maintenance to prevent debris accumulation in the trigger mechanism. Note: air leakage behind the carburetor can also cause high idle speeds--make sure the carburetor is fastened securely and that there are no flaws in the gaskets and heat insulator located behind the carburetor. Hope this helps!
Open the cover over the air cleaner so that you can observe the action of the throttle cable and carburetor lever. Operate the throttle--normal action is lever wide open at full throttle and lever resting on idle stop screw when throttle released. If action is restricted, disassemble the handle where the throttle trigger is located and clean out the sawdust. Recheck throttle action. The throttle cable shouldn't require lubrication. Clean the air filter and check the operation of the engine. Hope this helps!
If you had this apart, a few things may have happened. First the linkage from carb to throttle trigger maybe jammed between plastic housing or linkage may have come apart and throttle is in the full open position. You'll have to take this apart again and follow the linkage between carb and throttle trigger to ensure all is connected and moving freely and properly. Use care when putting housing back together.