I bought a used Troy Bilt Bronco riding mower (2003 model) for $400 as a small project to understand the small engine. The model and series number are here

Model Number: 13av60kg011
Serial Number: 1b189h10031

Manual can be found here, search for relevant document.

Side by side comparison of Pony and Bronco.

And, understand the Kohler SV540 engine
Engine surging won’t idle smoothly

Here are a list of basic tune up

	
Air filter
	
Fuel filter
	
Engine oil change
	
Spark plug

Here are some useful video on tune up.

This guy gives simple instruction for a basic turn up on a Pony -- suggested every 25 hours.

Tire replacement carlisle available at Walmart

Oil change seems easy.

Potential problem fixing

Working on the carburetor to solve the problem. 

This video hits the engine that I have on my mower.

I will need this repair kit to repair the carburetor.

This fuel solenoid is very important and fragile part located at the bottom of the carburetor. 

How to replace the drive belt, hopefully I never need to do this.

To get the deck off seems quite easy and straightforward.

It is not common, but we have a broken blade engagement cable, we bought replacement at Amazon and we fixed it just like that.

It turn out that we there are two different kind of cable end connections, and ours is like this one.

Here is one good video on changing the timing belt of Honda Pilot.

Here are some note I write on this:

In order to complete the timing belt job, we need to keep track of the following major checkpoints, a.k.a. critical points:

1. Loosen the crankshaft bolt -- deal or no deal situation
2. Timing marks and manually crank the shaft -- extremely critical
3. Pulley tensioner -- when to pull the hydraulic pin 

To facilitate the job, there are steps (some are not shown) to keep in mind

1. Drain the coolant from the radiator -- don't want to make a mess
2. Drain the power steering fluid and then remove the power steering pump -- reverse these later 

Additionally

1. We earnestly need that power tool to loosen the bolts
2. We need a 3/8 or 1/4 torque wrench for water pump -- to ensure all the gasket is properly sealed but not too tight

It seems that I need to fix the car AC system, as a start, let me accumulate some videos.

	
8 possible reasons that clutch fails to engage, pretty thorough.
	
This guy shows the noise diagnosis and fixing on a car AC problem. 
	
Replacing the 2007 Acura RDX AC compressor pulley

If one needs to replace the compressor, there are a few things to keep in mind

	
Make sure the compressor comes with "right amount" of oil, otherwise, we have to supply the oil like shown in this video
	
Make sure to get new O-rings for both high and low valve connection, use the oil to lubricate the O-rings properly
	
Get a manifold meter to monitor the AC system
	
Vacuum the system to -30 on the low side and wait for an hour to make sure it seals well. Then put on the vacuum for another 45 minutes
	
After connect to the refrigerant, make sure to purge the residual air/moister in the yellow feeding line.
	
Turn the AC on and fan on, start to fill the system until the compressor kicks on. Continue adding right amount of the refrigerant

I am slowly accumulating information and knowledge about home HVAC system. Earlier on, I have a failure to start problem and it turns out to be a bad thermostat diagnosed by a friend.

General concept and knowledge about home HVAC system
This post provides basic knowledge about electricity.

Here are some possible items to document, 15 videos of maintenance tips

He suggests 15 maintenance tips to perform to maintain the system

1.	Uncover the unit
2.	Cleaning condensing coil
3.	Check wire and components
4.	Check the capacitor
5.	Check the suction line cover
6.	Level the base 
7.	Turn AC on earlier
8.	Check the fan – kick start
9.	Check the temperature drop
10.	--

	
Spray cleaning the unit thoroughly

Basic wiring diagram for HVAC system
There are many online service tech resources, I have found a few very good tutorials

The clean one is AC service tech llc on the home HVAC service board and wiring.
This guy explains the wiring to HVAC very well, I want to give me a thumb up.
And, he drew a very good diagram.
Checking the power to the thermostat.
Another guy makes an interesting little device to show the wiring diagram!
He has an earlier video on this device, which explains the same concept.
It turns out that he has a series of such device, this time it illustrates the "coil" function.
Another post on a dummy digram also illustrates the connection and how they can fail. He lists out relevant books, more videos and tools to test the system and fix the problem.

Google nest learning thermostat

My friend has a failure, I need to understand the basic Google Nest Learning Thermostat
It turns out that yoububer does a better job explaining it.

Check the compressor

Fan motor is not working, this guy provides a very general video but does not give very instructional step by step. I need to research more on it. 
I like his post
He puts out a very clear capacitor testing video as well. I think I still need a wiring diagram.
Normally, there are two capacitors that power the outdoor condenser and condenser fan/motor like this 
Someone says this way is not a good way
Chris does not like the above video.

Here is another hand drew diagram

Check the furnace

All about capacitor fails
I found this post extremely helpful.

There are three major connections: labeled as C-connector, HERW, and fan. Like the follow figure shows.
top connection.

These three connection points can be identified by the number of tines, revealed by the following diagram



4-tine common (black), 3-tines HERM (white) and 2-tines Fan (Green). In our system, there was one wire connected to the fan, two different color wires to the common, and two red wires to HERM. Referring to the following diagram.



I found another post on how to wire these component with a duo capacitor. The wire is different from our system though, we have two wires go to HERM.

My friend gets a 2003 Acura MDX, and recently he hears noises coming from the driving belt, we suspect it is the problem with the driving belt and I think it could be tensioner pulley

Here is the driving belt diagram:

Knowledge preparation from a good source

My friend like Eric’s video, which is also a good resource for auto repair.

As the above diagram shows, a serpentine belt slithers over several pulleys whose rotational energy powers different devices. The belt is typically connected to the following accessories:

Alternator
The belt helps power the alternator, which keeps your battery charged.

Power Steering Pump
The power steering pump pressurizes the hydraulic steering fluid. Without the belt running the pump, the driver could experience a sudden loss of power steering, which makes handling much tougher.

Air Conditioning Compressor
An air conditioning compressor sends fluid throughout the air conditioning system, so its functionality is key to keeping cool.

Water Pump
An engine needs the water pump to push coolant through the system and keep its temperature down. If the belt fails, it could result in your car overheating.

Water pump is driven by the timing belt that is connected to the driving shelf.

There is a video of replacing the timing belt, it shows the details belt/pulley connection.

I have found the closest video is from the second generation MDX. It is good enough for me to start from somewhere.

The lower 12 mm bolt: 22 newton-meter, 16 lb/ft
The 14 on the tensioner: 44 newton-meter, 32 lb/ft
The pulley only torque is: 59 lb/ft

Step by step protocol

 	
Prepare and line up the tools
 	
Sketch the belt diagram
 	
Loosen the tensioner and release the belt
 	
Remove the 14 mm bolt and 12 mm bolt to remove the tensioner
 	
Install the new tensioner: 16 lb/ft for the 12 mm bolt and 32 lb/ft for the 14 mm bolt
 	
Install the new belt to wrap all the component, by loosing the tensioner to finish

Unfortunately, replacing the belt and tensioner does NOT solve the problem. From Scotty’s video, he explains that it could be other pulleys. Well, we have water pump or alternator etc. He has another video that further explain how to use the right tool for the right job.

Another guy has summarized eight different kinds of noises. We will see how we can get to the bottom of it.

I have to study more and I am accumulating more videos at this point and after further examination, it starts to points to the crankshaft or harmonic balancer.

 	
This is the first video
 	
Okay, after all these "research", I think I eventually find a guy that shows exactly the the problem of harmonic balancer and how to fix it. I think this is a good video for fixing balancer wobbling.
 	
This video explains very well on what can go wrong if the harmonic balancer goes bad.
 	
Someone posted replacing the timing belt that needs to remove harmonic balancer as a start.
 	
The same guy posted the installation video as well.
 	
To clarify, the crankshaft pulley is different from the harmonic balancer.
 	
To get the job done, we would need a crank pulley tool and a puller

After all these effort, I come to this diagnosis. The wobbling noise comes from the AC clutch pulley. here are some good videos fixing the clutch.

I noticed the wobble when I wiggle the wheel bearing, so, I think it could be it. I found a very good video, and hopefully we can fix it somehow. 

This guy shows a good video tutorial.

Another guy is doing the same in vitro video.

This one is for 2003 MDX specifically.

There could be challenges removing the plat or the pulley, spacer is also critical for the AC to work.

This guy explains in more details on how to get the plat off and measure the space between the plat and the pulley.

The guys shows the important to check gap between the plate and clutch pulley.

To replace the clutch pulley seems quite simple and intuitive, but I encountered resistant from step 1. The following are the steps I need to achieve one by one

	
Remove the 10 mm bolt on the clutch plate. Luckily, done
	
Remove the clutch plate, but I can't! 


Can I use these tools to remove it?





	
Remove the clutch pulley, by removing the clip ring, then hammering it out.
	
Mount the clutch pulley back
	
Mount the clutch plate
	
Adjust the gap  between the plat and clutch pulley

Going through all these research, I want to document something related to the car AC system.

This video demonstrates how to diagnose a bad compressor.

Parts and tools for this project

Here is the serpentine belt assembly kit that I have replaced and it does not help to solve the problem.

Here is the compressor that fits 2003-2006 Acura MDX

Here is the compressor clutch and pulley that fits 2003-2006 Acura MDX

Okay, it seems that we may have to be prepared to replace the compressor!

Main steps are here as shown in the video:

	
Remove the serpentine belt
	
Remove the coolant fans to get room
	
Discharge all the freon
	
Disconnect the high/low pressor connection
	
Remove top two bolts from the top, two bolts from the bottom
	
Unplug the connection socket
	
Remove the metal bar to get more room
	
Remove the old ac compressor
	
Reverse the above steps and make sure all the connection are secured, reinstall the belt
	
Be sure to use the new o-rings for pipe connections.
	
Re-charge the freon
To work with the pressor, here is a good video on this.

Work on the tie rod

Very good TRQ video

2007 Honda Odyssey

Another friend has a car AC issue, his car is Honda Odyssey 2007 and we diagnose that the problem could be the “coil” failure

He found a video, but I feel that the person did not record those difficult steps.
So, I searched around and found another video, he did not record the whole process, but at least he mentioned a few challenge steps:

He mentioned that the location of the compressor makes it hard to reach
The first trick is his wife helped to remove the serpentine belt from the top.
He mentioned the tool to hold the cap when he tried to loosen the 10 mm center bolt.
He show two different ring snap plier, they are very hard to be removed.
He mentioned to using a rubber mallet to snap the pulley off

These are difficult steps he encountered, we can see more but hopefully less.

Wiring a outlet:

Here is a basic knowledge on this.

Outlet connection:
Brone: fire, “black” or “red”
Silver: neutral, “white”
Green: grounding 

I bought a Mossberg Maverick 88, and I am learning shotgun 101

First review is here

Here is a review on the semiautomated shotgun

This video provides interesting detail information.
I think this video is much better than the one above. However, it seems that his driver is different from mine.
This video is from Mark at eReplacement, it seems so simple for Mark.
Here is the part diagram at eReplacement.com.

When I try to switch the rear derailleur to the highest gear, it will go off the into the grove. A friend tells me to turn the “H” a couple of turns (clockwise), but it does not seem to work. When I looked up online, I found a very good video that gives the basic.

Here are the main steps to adjust:

	
If the derailleur hanger is clearly bent, it needs to be fixed first. Derailleur Hanger Alignment
	
There are three screws: L, H, and B on the derailleur, H is for the smallest gear and L is for the largest gear and B is for the chain gap
	
There are also bearing adjustment screws for tightening the cable.
	
Use the largest front chain ring if it has multiple rings 
	
And, switch to the smallest rear ring
	
Locate the bearing adjust screw and turn it clockwise to expand the cable
	
Locate the "H"-limit screw
	
Make sure the chain is on the outermost gear on the rear and slight noise can be heard when moving the chain.
	
Turn the H-screw 1/4 turn (counter clockwise) at a time until no noise is heard

Here are my updated note

Put the chain on the outmost gear on both front and back.
Push more on the shifter out to max the position.
Turn the bearing adjuster clockwise a few turns.
H: clockwise makes it inwards; counter-clockwise makes it outwards.
Tighten the H adjuster screw until hearing the noise
Slowly turn the H screw counter clockwise, 1/4 turn at a time until no noise comes out.

Adjusting the index

Put the front in the middle gear, 
Adjust the bearing screws.

My friend recommended Park Tool

袁老师的教学录像讲解得非常清楚
这个两分钟的视频告诉大家修剪的技巧：1，主枝要斜叉剪；2，侧枝要留结。
同样的一个频道给出更多技巧。