That's right,a real tractor question. Here's a problem that's been plagueing me all winter. I have a 6 cylinder gas chore tractor,used twice a day seven days a week. Electronic ignition,has been for 2 years. Good cap,rotor,steel core wires,plugs. It runs smooth up to about 1500 rpm with no load. Over 1500 or at any speed with the least little load,it'll miss. Doesn't always smooth right back out when you take the load off or idle it down,but does sometimes. If I start pulling wires while it's missing,it usually seems to make a difference on #6. Take the plug out,it looks normal. Put a new one in,the same thing happens. I haven't taken the tappet cover off yet. Whadaya think? Broken valve spring? Worn cam lobe? Opinions?
- Thread starter rrlund
- Start date
supergrumpy
Member
might be lean mixture, how do the plugs look??
try some Seafoam in the tank, might have some gunk clogging part of the carb, especially with the stuff they sell as gasoline
try some Seafoam in the tank, might have some gunk clogging part of the carb, especially with the stuff they sell as gasoline
Anonymous-0
Well-known Member
Checking a coil with an ohmmeter is pretty much a waste of time. It will tell if a coil is bad but not if it is good. A much better test is to hold the coil wire 1/4 inch from ground and see if it produces a fat spark.
Allan in NE
Well-known Member
Is the compression on #6 okay? Slop in the distributor shaft?
Allan
Allan
Janicholson
Well-known Member
If #6 was bad it would not make a difference! when checking, the cylinders that make the most difference are the good ones! A worn distributor shaft or bad advance mechanism will make a electronic ignition just as bad as points! Put a timing light on it to check total advance. JimN
Anonymous-0
Well-known Member
I would check for intake leak
~Will
~Will
Anonymous-0
Well-known Member
change the #6 plug wire and see.
Misses under a pull then smooths out.Well its probably not a valve because if it was a burned valve it would miss all the time.Might sound better without a pull on it,but its not going to hit without compression.Cracked intake or blown intake gasket might make it miss worse pulling.Distributor cap,wire,or distributor shaft being loose,low compression on that cylinder,are all things it could be.You didnt say what kind of tractor it is.If its overhead valves it would miss bad with a broken valve spring.Need to do a compression check if its not cap or wires.My H was doing that but it was worn out and had those resistor wires on it when I got it.Changing wires helped that but it was so worn out it would foul plugs out.I would try to rig up some way to check how its firing like a spark plug clamped on it somewhere that you can hook the wires to one at a time when it does it and see if its not a wire,or cap and which one.
Anonymous-0
Well-known Member
Pull the sediment bulb assy. out of the bottom of the tank & see if it is plugged with bugs or something.I have had 2 this winter that acted like this that were just about totally plugged.Easy to check.
HeyPigFarmer
Member
Does it smoke black when it's missing, if it does lean out the power jet, if it doesn't add more fuel. Change your plugs. Spray either around the intake to check for a leak. Is the distributor in good shape? Has the carb been rebuilt lately? These are just the problems we chased around on an 1850 Gas we had for a short period.
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