| Author | Message | ||
     GKnowlton |
My 550 gas has an intermittant, backfire and fouls plugs. New plugs/points were installed last fall. Cleaning plugs will help for about 15 minutes of snow plowing. When the tractor runs good it is perfect and has power. Moving or wiggling plug wires or govenor control doesn't seem to make a difference. Tried new gas and heet and sediment bulb looks clear. If the new cap and wires don't work I am at a loss. Any other ideas of what else to check. This tractor ran perfect last fall and is garaged. It ran for 40 minutes last night with out a misfire then would barely run to get back in the garage. | ||
| Tom Anderson |
2-5-04 I am betting on the new cap. You can check the plug wires pretty easy by starting the tractor in a nice dark barn and watching for jumping sparks. Look at your points real good. I once had points that did not look burnt, but were oxidized and mis-firing. A few years ago, my S-55 had an intermittant backfire that I could not figure out. After I got it back from a neighbor jack-leg, true barn yard mechanic and nearly $500 dollars, it started doing it again. I did a thorough exam with my neophyte eyes and discovered that the bottom of the hand rod that operates my starter had become loose and was at times making contact with the bottom of my coil. It was a quick, free fix. I imagine that Oliver corrected that problem on those nice fancy new generation high falutin' 550's !!! Please let us know what fixes it ! From a humble S-55 owner. Tom Anderson | ||
| Chris Losey (Admin) |
Do the cap and wires first. Also consider a coil. Shouldn't be as much of a problem in colder weather, but they do go bad. Also make sure the coil is getting good voltage- no bad connections. A spark jumps the gap easier in open air than under compression, so you want a good strong, blue spark. Might be a sticky valve, but I'd check the simpler things first. | ||
| Barry Ellwyn HPOCA 9205 |
I agree with the coil theory. Very slight changes in humidity and temperature can cause a bad coil to show it's temperment. I have had the same backfire problem on my 550 and it was in fact a coil problem | ||
| G Knowlton |
I changed the cap and wires. It solved the problem. It now is making the tractor run a little richer as it smooths out if the choke is pulled out a 1/2 inch. I will adjust the carb after it warms up out side. |
