balls
Okay so I got a mower off craigslist, restored it and now it is having some problems.
When primed it starts up usually first pull, so as you can see it runs pretty well. But it seems that it shakes quite a bit and that every 5 or 6 seconds a pop or 2 will come from the exhaust. What is a common cause of this?
What is the easiest option to check first? I don't want to take a part the engine to check the rod or anything if it is not necessary. I have the oil set at full so it is not low on oil. It burns a little bit of oil as well.
Its a 5HP Briggs and Stratton Four Stroke Push Lawn Mower.
Answer
Most lawn mowers have a very simple ignition system. The flywheel has a magnent which passes coil and produces the spark plug voltage. The timing of the spark (which is your problem) is controlled by the flywheel connection to the crankshaft. It has a "key" which fits into slots in the flywheel and the crankshaft. Often, when the blade of the mower hits a solid object, like a curb, the key will start to shear. If it shears completely the engine won't run. If the key just gets bent a bit it throws off the relationship of the flywheel magnet and the pickup coil enough to cause your problem.
Take off the flywheel (under the rope pulley) and remove it from the crankshaft. It's a tapered shaft. Pull out the little key and get a replacement from Ace hardware.
Most lawn mowers have a very simple ignition system. The flywheel has a magnent which passes coil and produces the spark plug voltage. The timing of the spark (which is your problem) is controlled by the flywheel connection to the crankshaft. It has a "key" which fits into slots in the flywheel and the crankshaft. Often, when the blade of the mower hits a solid object, like a curb, the key will start to shear. If it shears completely the engine won't run. If the key just gets bent a bit it throws off the relationship of the flywheel magnet and the pickup coil enough to cause your problem.
Take off the flywheel (under the rope pulley) and remove it from the crankshaft. It's a tapered shaft. Pull out the little key and get a replacement from Ace hardware.
how do you set the timing on a lawn mower?
Q.
Answer
You set the valve timing by lining up the spots on the timing gears when re-assembling the motor,.... its all but foolproof.
You set the ignition timing by making SURE the key way and the square key and the slot on the flywheel all line up exactly......again, almost foolproof.
The embedded magnet(s) in the flywheel pass the induction coil magnet and that charges the coil, and shoots the spark to the plug....
With the proper stoichiometric fuel ratio, the engine will run.
You set the valve timing by lining up the spots on the timing gears when re-assembling the motor,.... its all but foolproof.
You set the ignition timing by making SURE the key way and the square key and the slot on the flywheel all line up exactly......again, almost foolproof.
The embedded magnet(s) in the flywheel pass the induction coil magnet and that charges the coil, and shoots the spark to the plug....
With the proper stoichiometric fuel ratio, the engine will run.
Powered by Yahoo! Answers
Tidak ada komentar:
Posting Komentar