OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Four Stroke Lawn Mower Frames b&s 5hp

dear bruce.
my 5hp b&s elec start,wont start with the elec start
but will start with the pull starter.the bat,is fully charged ?
new spark,new coil,coil gap ok+ the starter motor is rebulit
engine number 130907 0425-01 74010406.thank you fred.

Fred,

Is this motor on a ride-on or push mower?

dear bruce,its a rover colt major ride on mower ive just taken the starter button & acutater ? for testing,what the hell is a acutater,its a
small sqauer box with - & + pins,what does it do.Ive asked heaps of mates,and even bugged local mower guys.its a very long road.
Ive allready resprayed the body and engine.thanks fred.

Fred,

Have you tried to see if the starter motor is working by using direct power?

Are you talking about a regulator?

dear bruce. it was a stator ,+ & - and two ac conectors,tested ok
+ the starter button,ok.it started with the air cleaner off,but
back fireing through the carby.air cleaner on,starts 1,2 pulls
when using elec start,nil,+ fuel leaking bet/car band tank.
carb badly warped,replacement tuesday.

dear bruce,fixed the fuel leak bet/carb and f/tank,cont,s not to start with elec starter,I mean the elec starter +starter motor works,but wont fire!,as I said it,ll start with the pullstarter
but wont start with the starter motor,have checked spark when
useing s/motor,heeps of spark,has me stumped,any ideas.
cheers fred.

Fred,

Have you tried to put a small amount of fuel down the carby throat in order for it to start or does it start normal?

Did you check the valves?

Is the motor turning over slow with the starter motor?

dear bruce. I,ve cleaned the valves,but didnt check the valve
clearence.I,ve used starter spray,!at times the starter motor will turn over slow,if it does I,ll charge up the battery.
it cont,s to start 1or 2 pulls.I just checked whether I,ve got
air fuel leak,on popped on some sealent,while the battery charging .I dont have any wiring guide lines on how the rover should be wired, and whether theirs some thing wired wrong.
cheers fred.

Did you check the inlet valve as they tend to pit (look really close). I think your air leak is a damaged valve or a clearance problem.

By the way using start youbastard is not a good way to get things running.

dear bruce, your right about startyou barstard,I dont allways it
only to see if I,ll start.it was back fireing through the carby,
yes, I aggree about the valves,Ill get them done asap.
but it doesnt backfire when I pull start.cheers fred.

The reason why it backfires is the valve seats not sealing properly as well as a partly sheared flywheel key.

dear bruce,I,ll check out the flywheel key
asap,I dont know wether the flywheel has been off in the past,my dad ment/this this
morning,about the key being sheared. will the new key ,with the new coil fit.
cheers fred.

If you have spark all you need to do is first replace the flywheel key as it only cost about $2.

Try this first before going any further and let us know if it worked.

dear bruce,i checked the key way it was ok ,I had a spare one so
I replaced it,yes the valves ,friday they,ll be fixed up.
ps,the intake valve looks bad. cheers fred.

Fred,

Great to see that you found the problem. The more that you tell us the easier it is to help you with an answer.

With the intake valve did it have one side like channeled out partly?

dear bruce,I can look down the intake and see daylight around the
intake valve!!!!!,I tried to check the gap for both valves,could,nt
even get the feeler gage between the valve stem and the tappet,for
both of them.still stumped about it starting with the pull starter,and not with the elec starter.I,ve alot to learn ,friday a
friend will fix the valves+ teach me how to check and repair them
I cant wait. cheers fred.

dear bruce, all done,valves ext,ext, but still wont start with the elec start,batt fully charged, system is chargeing,still back fireing through the carby,while turning ,but will start first pull .any ideas. cheers fred.

Fred,

Can you check that the fuel in the tank has no water in it as well as your fuel can. Also remove the fuel bowl and see if you have water in it.

What valve clearence do you have on the valves?

dear bruce, the valves were done by a friend on gap?,the fuel is
new ,I checked all the eath points,and cleaned them all up,took out the spark plug,ran the starter ,blue spark ok,cont,s to blow
back through the carby.fred.

dear bruce, I found out that the starter motor was not turning fast enough ,it was bulking !even through I had it fixed.so my friend has taken it off for a good clean up,hope. fred.