THIS IS HOW I FIXED MINE, IN THE CASE OF.... "I CAN'T START MY GENERATOR" It's has been two years since last time it was running, so I started by checking oil level full at gen dipstick (it won't start if low oil because of sensors) then I checked gasoline more than 1\4 tank in the RV (also safety sensors), sparkplug checked for good spark, also checked the manual reset circuit braker ( to be ON) at front motorhome engine compartment for 12v current to the generator to be able to start it, also cleaned the carburetor and even installed new one but same situation, then checked wires and found some has been chewed like gum by rats at the back of starting switch generator panel so I replaced them, at this time the generator started but stay running only by keep pushing the switch on all the time, so then finally I knew it was internal electrical problem from the engine itself, so I took the generator out from my RV to work in my garage, (I did this by myself with some tools and old Mayan tricks ) lol, it's really heavy for one person. I disassemble the unit at my garage and started by removing the cover, then the cooling fan or flywheel unit (it's 2 items in one) until finally I was at the gen rotor and brushes assembly area and this is what I found: one more wire chewed by filthy rats plus the stinky rat nest in the middle of the generator motor coil, I fixed the wire and sanded the commutator copper contacts where the brushes are sitting becouse they were real duty with old urine from the rats, and of course I got rid off the stinky nest, lol!!! Then I assembled everything back together and... bingo it's runing like a champion!!! For this project materials involved was about $60.00 including an aftermarket new carburetor and an harmonic balancer/steering wheel puller (available at any auto parts for $25.00) to pull the aluminum fan out and (flywheel). Just picture this: (Any gasoline engine run smooth if gasoline and DC current aren't interrupted) so following this important principle you'll always find the problem to be fixed. Also if you have a onan microlite 4000 like mine, don't run it for more than a minute without the cover because you'll cook the engine real fast, also keep the eye on the aluminium fan and your fingers after cranking it in case you missing one or two members...just kidding, lol!!! After testing the gen with the help of a gasoline container, a piece of hose and 12v battery, I did put the air cooling assembly back and the rest of components including the cover, then it was ready to be installed at my RV. Once the gen was installed back at my motorhome I started it to be tested for 120v electricity but not before flipping the AC circuit switch (on) at the gen starting control panel (sometimes hiding under or around the panel) to be able to transfer power to my RV GFCI main outlet and electric panel as well, my motorhome it's equipped with GFCI so I reset it and tested for green led light indicating power is ready at my main breakers panel, so I turned my main breaker (on) along the others ones but no power was present at my breaker main switch (faulty main braker) so I flipped it many times, sometimes you can make it work again, mine did work, lol!!! I'm happy because everything works now including the refrigerator for cold drinks and AC for this crazy summer, lol! Later I'll buy me a new main braker, for now this is a resurrected generator story that needed to be shared. If this can help eaven one person to save time and $$$ it'll make me more happy, thanks for reading!

I am fighting problems with a KY4000 gen with 146 hours. It runs, but surges, slows down, seems to recover, and slows down again. It seldom stays running for more than 20 minutes. I did my own oil, airfilter, and sparkplug during my first generator service and discovered that filling the oil to the full line, might actually be over full. I had to reduce the oil to mid-line on the dip stick before it would run. It was fine after that. The fuel filter said to change every 500 hours, so I did not change it. Because now the engine is acting like it is starving for fuel, recovering, and then starving for fuel again, I decided the fuel filer must be plugged and replaced it last night. No joy, still exactly the same behavior. So, next I will replace the air filter, and continue to work through the problem until it is solved. I did notice that at the start of you video you show replacing the air filter and then putting the air filter cover back on with the external wing nut. I believe you may have missed a step. There is a second wing nut on the filter plate that can't be seen, but which must be removed and then put back in place when changing the filter. If you don't know to look for it and care for it, it is impossible to remove the air filter and replace it. Refer to the diagram on page 15 in the generator manual.

What size spark plug wrench and what spark plug do I purchase?

Great video 👍🏻 well done.

I know there was a single screw holding the Black cover on where the spark plug is but you did not show this and as it's difficult for me to see up in that area since my generator is in the middle underneath my RV like to see a technique for removing that

Music is annoying

There should be a wingnut on the filter itself ....

Need a view showing where the fuel filter is screwing into?

What is the grade of oil that should be used?

Greetings:-) Can you help as to any knowledge/experience in conversion to propane... I understand they run cleaner and easier to start after sitting. Thanking you in advance, -keith

Every 150 hours for oil change. Every 300 hours for air filter. Every 500 hours for valve lash check on the Micro 4K (.002 intake/exhaust) cold engine. Every 500 hours for fuel filter. Planning on storing RV? Fill fuel tank with Sta-bil fuel treatment (proper concentration) then run generator for 15mins. Then shutoff to store. Do not use vise grips to clamp off fuel line. You'll damage the hose. Use fuel line clamps that are made for that without causing damage to the rubber hose.

What spark plug is it?

Why do people think adding shitty music to anything helps it. Had to stop watching.

what about the 2nd plug