Small Engines (Lawn Mowers, etc.): Poulan Pro lawn tractor w/BS Intek 18.5 HP OHV, laugh laugh, compression resistance


Question
I'm having starting problems.  Upon turning the switch, only a brief grind, with no engine turnover. Battery checks out, starter checks out, fuse is OK, I replaced solenoid.  Same problem exists.
Poulan dealer can't get to unit for over a week, and suggest adjusting valves, which I will do.  How do you make sure engine is "top dead center", and how do I identify intake/exhaust valves.
Thanks so much for your help.
Chuck

Answer
hi  chuck

have you tried a battery positive to starter motor  terminal bypass wire  ( ie  starter cable ) from  car jump cable set )

is battery fully charged and  all cables/ connection clean and tight  and does machine have good battery earth connections  and no excessive resistance  

does the unit sound or act like its come up against alot of compression resistance ?
inlet valves are usually  the ones that that are closest to inlet manifold

but not allways   just to confuse you more    laugh laugh  
as in the case of b/s vangaurd single cylinder  there inlet valves are on the bottom side  beside  muffler  and exhaust is on the top side   because they use reverse cross flow heads


may be the decompressor is not working correctly ?  
try removing valve rocker cover( s)  remove plug(s)  and rotate  1st cylinder while watching the intake valve open then close  ,then continue turning until piston is at tdc  ( use a small screw driver in the plug hole while rotating to tdc  it will stop at its highest point  ) then rotate the piston down the bore on power stroke 1/4 inch or 6.35 mm   and set the valve clearnace  on intake  to 0.003" and exaust to 0.005" @ this point only  with feeler gauges, and tighten loc nuts making sure not to move the setting you just make  

repeat this  proceedure for the other cylinder if it is a vee twin cylinder

if a vee twin  number 1 cylinder is the one  that is closest to the flywheel
if you look at engine from the front  ( if v twin you will see that 1 cylinder is set higher than the other )  the highest one is the  closest to the flywheel  & is number one



cheers  paul    hope this helps