Hyster S50XM:
engine fighting starter (bucking when cranked)

I was wondering if anyone has had this problem. I have had 3 hyster s50xm's now all with the mazda engine and spectrum fuel system in them do this. when cranking its like it tried to fire backwards and bucks but once fired it runs great. I have figured out with no fuel in the system it cranks normally (eliminating starter and ring gear). I have even had a known good running truck right next to the bad one and swapped distributor, fuel converter, many other parts with no change and im at a loss. I would like to solve this as one truck does it so bad it eats up starters every few months
  • Posted 6 Apr 2017 10:24
  • Discussion started by vashxj
  • illinois
Showing items 1 - 3 of 3 results.
If the power feed wire to the distributor or coil is dropping out for a even a split second it's going to cause it to spark at the wrong time. Notice if you just turn the key on and off without starting on that type of ignition system it causes a spark. Maybe if that circuit has a problem it is throwing a spark at the wrong time.
  • Posted 6 Apr 2017 20:03
  • Reply by mrfixit
  • New York, United States
Thanks for the reply, I have checked voltage it usually never drops below 10.5 at most and has gotten a new battery before. I thought about the amp draw too; it has new starter, ignition switch, and bat cables. I even added in a relay on the starter wire so it has direct power not going through all the safety switches. With no tank hooked up This thing cranks like crazy and sounds normal. This is a rental unit so I have had a lot of time with it. Have also gone through the timing a few times. Even got a new head from the possibility that it had been machined down to far and screwed up compression. Almost wondering if it's a controller issue, I don't see a ignition relay like they have on the gm 3.0s and there is not to many Mazda hysters running around
  • Posted 6 Apr 2017 13:25
  • Reply by vashxj
  • illinois
check the timing
and also check the volt drop on the battery and amp draw on the starter while cranking
  • Posted 6 Apr 2017 12:50
  • Modified 6 Apr 2017 12:52 by poster
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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