Have a mcculloch M3816 chainsaw and cannot figure out how the trigger mechanism activates the throttle in the handle

SOURCE: poulan 3400 chainsaw throttle trigger

Its a missing or broken spring in the handle(trigger). If you look inside the handle you should see a circular spring around the post of the trigger. This spring returns trigger to idle position. If its missing or broken the trigger won't spring back.

SOURCE: how to fix throttle trigger on a poulan chainsaw?

The trigger, lockout or trigger/lockout spring has failed of may have debris stuck in handle. remove handle cover and inspect. If parts broken follow this link for parts breakdown.

http://www.ordertree.com/modelinfo/PWE/PP4218AV/75.PP4218AV.1.7.1.html

SOURCE: installing throttle cable on Husqvarna 445 chainsaw

Try blocking the throttle arm on the carburetor in the wide-open position with a small stick, then deal with the trigger mechanism. In order to remove the cable from the carburetor, you need to remove the carburetor itself, then unhook the cable end at the throttle arm. Keep track of which fuel hose goes where if you do this. Hope this helps!

SOURCE: NEED INSTRUCTION MANUAL FOR MCCULLOCH 838 AS CHAINSAW

Found it at
http://www.mcculloch.biz/int/support/owners-manuals/?query=MAC+838&types=O

Testimonial: "Thanks exactly what i was after,thanks again."

SOURCE: McCulloch 120 Chainsaw Owners Manual

McCulloch Manuals
Operators Manuals: are much more difficult. I have dialed this number many times (Contact Us - All McCulloch Products 1 (800) 521-8559) and have yet to get a satisfactory response. Please try this! If enough of us try they will fix it! If unsuccessful with McCulloch try here:
Beg for manuals thread (ArboristSite - free to join).
http://www.arboristsite.com/showthread.php?t=72322
Include your e-mail address in your request or it most likely will not be answered.

If you have more questions or need additional help please reply below and I will get back to you. Good Luck. HTH
Lou
Thank You for using FixYa.