Results

1. 
   
   

   Post on Rotax 912 slow cranking in 4-strokes

   By ChrisBolkan, posted 18 Nov 2021

   Hi!
   My Avid has a 100HP 912s. It is not cranking fast and kicks back while cranking. It used to crank much faster and did not kick back. Once it is started it runs fantastic just like always.
   I took the battery out (Odyssey PC-612) and had it load tested. It tested good. I have not put a voltmeter on the battery or across the starter to look for voltage drop while cranking yet. I will do that as soon as I get back to the hangar with a friend since it takes two people to do those tests.
   My wiring is of plenty adequate size, connections are good and clean. I am willing to bet there will not be excessive voltage drop anywhere when I do check it.
   What I am wondering is: Has anyone experienced the starter on the 912 going bad slowly (worn brushes, solder flinging out of the commutator etc.) causing a mysterious slow down in cranking speed? 
   It looks like it's going to be a kind of a PITA to remove the starter. It would be nice to hear they can go bad and crank slow before I rip it out and take it apart.
   Anyone have an experience like this before?
   Thanks!
   Chris