Topic: slow crank

[ARC C63]

on my 35cb vangard with ec cam, arc rods, cut pistons dual spring valves

when i go to start the mower some time it spins nice other times spins over 1/2 a spin and stops 

[Junior]

Does it have a lot of compression if so you might need to go with a starter that has more torque also you might not have heavy enough battery wire or a loose connection any time I build an engine I upgrade my battery and wires hope this helps some. 

[ARC C63]

im jumpinf ti with a 850cca batt to the start and dose the same thing

[Junior]

ok is it a stock starter ?

[Darkviper]

Try automotive battery cables because my ohv brigs single had to much compression and did the same thing. I used stock starter.

[Junior]

I had the same problem with my 26 hp briggs it kept frying starters so I went with a high torque starter and some 0 guage battery wire now it spins over with no problem

[ARC C63]

i dont thing it is the starting system dont hey have compestion releaf for starting or something of this naecher

[leadslead]

No on comp release try thick cables worked for me my battery cable is about size of my??? pinky finger ???
Also check valve lash new springs it will change

[Darkviper]

My ohv single with stock starter didnt have compression release and with it being fully built and high compression. I had to roll it over the compression stroke then turn it over or you have to run 2 batterys.

[royalblu68f100]

Also your start button could be loosing connection occasionally.  Does it have a solenoid on the starter or mounted separately? Either solenoid could cause a intermittent problem.

[leman]

Use thick wires, check your connections, and if you can, ground your battery to the starter, not your frame.  That will give you a more direct circuit to the starter and will help get all of the 850 cca to the starter and not lost somewhere in between.

[ARC C63]

boy do i have egg on my face my new starter had 2 bad coils and was stoping the motor

[birdman_express]

boy do i have egg on my face my new starter had 2 bad coils and was stoping the motor

Well, it is hard to see inside a starter....we never expect new parts to have issues,
but they do from time to time.

[saltyAMF]

sounds like your battery is weak.

if u have hd starter and good connections with properly sized cables thats got to be hgere.  put a voltmeter on it while cranking...  if it dumps you know its junk

[jerb]

even if starter was bad, run the heaviest cable that you can still work with, you would be suprised the difference it can make and as said run the negative to the starter itself as well!