used: when did your timing change?
how many starts have you made with that starter?
Many Auto Electrical Mechanics love repairing starter motors, they make a living out of it...
i Had a car that was always hard to start cause it was never serviced. I didn`t care for this vechile it would always get hot then boil, drian the battery flat, refill the water and jump start and we were off another 8 klms flat out till our next pitt stop.
The motor was down two cylinders bent valves, cracked head, faulty alternatorand much more.
no way i ways speeding money on this 1000cc Mazda Van .
Anyway it wouldn`t start because there was something not operating efectivly...
there is a coil boost start terminal on many cars which delivers full current to the ciol when starting,, it's controlled by the starter, when cranking the voltage to other parts of the vechiles electrical systems are lowered due to the large amounts drawn by the starter . some starters have a terminal designed for this function others do not . its striaght forward to install if starting becomes a problem to the ignition....
When cranking, positive voltage will appear at the electrical starters motor,, From that piont a wire is connected and feeds a 'feild' coil on a relay.
(other side of the coil to ground-)
The relay will operate its contacts in the cranking position. These contacts allow you to supply the Coil with full current whilst cranking, From battery + thru relay contacts to coil Positve+..
make sure the relay energizes only when cranking Happy Cranking