Honda C90 - putting it back together

Honda C90 - putting it back together

Intro If you have dismantled your bike in order to refurbish it then, once you have finished reassembling the engine, you will be faced with a large pile of bits that need putting back together. In the immortal words of the old Honda manuals: "Perform the reassembly in the reverse procedure of disassembly."...

Intro If you have dismantled your bike in order to refurbish it then, once you have finished reassembling the engine, you will be faced with...

C90 Engine
Honda C90 - air cleaner and exhaust

Honda C90 - air cleaner and exhaust

It hardly needs saying but the engine only works when air gets in one end and exhaust gasses exit the other. This article covers the two systems on either end of the engine, the air cleaner and the exhaust. Muffler and exhaust pipe Although in the UK we tend to refer generically to "exhaust...

It hardly needs saying but the engine only works when air gets in one end and exhaust gasses exit the other. This article covers the...

C90 Engine
Honda C90 - Crankshaft

Honda C90 - Crankshaft

The forces created by combustion pressure are transferred to the piston through to the connecting rod, causing the crankshaft to turn and thus converting the reciprocating motion of the piston to rotary motion. Here's what I learned about how it works. construction The connecting rod is located on the crankpin and the webs[...

The forces created by combustion pressure are transferred to the piston through to the connecting rod, causing the crankshaft to turn and thus converting the...

C90 Engine
Honda C90 - transmission and performance

Honda C90 - transmission and performance

The transmission takes energy from combustion and transmits it to the rear wheel. The mechanism is shown below: The power is transmitted through a fairly convoluted path before it reaches the rear wheel: energy created by combustion forces the piston downwards causing the crank to rotate. The crank rotation is then transmitted through the clutch...

The transmission takes energy from combustion and transmits it to the rear wheel. The mechanism is shown below: The power is transmitted through a fairly...

C90 Engine
Honda C90 - brakes

Honda C90 - brakes

The c90 uses a drum brake design that is essentially unchanged since it was first introduced over 120 years ago. Renault drum brake Drum brakes were first patented by Louis Renault in 1902 (see the patent diagram below left). Despite its apparent simplicity this invention was a huge improvement on the previous alternatives which had...

The c90 uses a drum brake design that is essentially unchanged since it was first introduced over 120 years ago. Renault drum brake Drum brakes...

C90 chassis
Honda C90 - forks, suspension and steering

Honda C90 - forks, suspension and steering

This post explains the design of the Honda Super Cub suspension and steering. If you are interested in fitting tapered roller bearings instead of the standard ball bearing used in the steering head then see here. Leading Link Forks All the Honda Super cubs since their introduction in 1958 until relatively recently were fitted with...

This post explains the design of the Honda Super Cub suspension and steering. If you are interested in fitting tapered roller bearings instead of the...

C90 chassis
Honda C90 - piston, cylinder and combustion

Honda C90 - piston, cylinder and combustion

Internal combustion engines convert the chemical energy stored in fuel into the mechanical energy used to power machines when the fuel air mixture is compressed in the space between the piston and the cylinder head and ignited by the spark plug. The design of the piston, cylinder and cylinder head plays an important role in...

Internal combustion engines convert the chemical energy stored in fuel into the mechanical energy used to power machines when the fuel air mixture is compressed...

C90 Engine
Honda C90 - lubrication

Honda C90 - lubrication

The first Super Cubs did not have pumped lubrication, instead the crank, piston and cylinder were splashed by oil thrown up by a dipper on the big end of the connecting rod. A similar device can be seen in towards the end of this excellent video about engine lubrication: As shown in the diagram above,...

The first Super Cubs did not have pumped lubrication, instead the crank, piston and cylinder were splashed by oil thrown up by a dipper on...

C90 Engine
JIS screwdrivers, screws and fasteners from Japan

JIS screwdrivers, screws and fasteners from Japan

If you've ever worked on a vintage Japanese motorcycle you've almost certainly struggled with countless buggered-up cross head screws. The usual recommendation to avoid further screw mangling is to put aside your old Phillips screwdrivers and get some "JIS" ones instead. There is a lot of confusion about this...

If you've ever worked on a vintage Japanese motorcycle you've almost certainly struggled with countless buggered-up cross head screws. The usual...

fixings
Honda C90 - lighting system

Honda C90 - lighting system

The final wiring system to look at on the C90Z2 super cub is the system that supports the lighting and horn. The wiring diagram is a bit more complicated compared to the ignition and charging systems: It is not as confusing as it first appears though, and if you trace the wires from the various...

The final wiring system to look at on the C90Z2 super cub is the system that supports the lighting and horn. The wiring diagram is...

C90 electrics
Honda C90 - charging system

Honda C90 - charging system

The charging system used on the 6v C90 super cubs is pretty straightforward and consists of a battery (to store electricity), an alternator (to generate electricity) and a rectifier (which converts the alternating current created by the alternator into the direct current needed by the battery). Here is the wiring diagram for the charging system:...

The charging system used on the 6v C90 super cubs is pretty straightforward and consists of a battery (to store electricity), an alternator (to generate...

C90 electrics
Honda C90 - ignition system

Honda C90 - ignition system

The job of the ignition system is to produce the spark that ignites the fuel/air mixture in the engine combustion chamber. It consists of a power source (either battery or a generator), a switching device to start and stop current flow at set intervals (contact breaker points or an electronic switch), a device to...

The job of the ignition system is to produce the spark that ignites the fuel/air mixture in the engine combustion chamber. It consists of...

C90 electrics
Honda C90 - electrical system overview

Honda C90 - electrical system overview

Electricity Learning the basics of automotive electrical systems, even the simple system used in the Honda super cub, was something I approached with a little trepidation. My schoolboy science got me as far as grasping that the electrons in conductive materials like metal can “jump” between atoms, displacing others in the process and thereby causing...

Electricity Learning the basics of automotive electrical systems, even the simple system used in the Honda super cub, was something I approached with a little...

C90 electrics
Honda C90 - automatic clutch

Honda C90 - automatic clutch

The history of the automatic clutch used in Honda's Super Cub motorcycles can be traced back to the 1940s. Soichiro Honda's early success with auxiliary engines had shown him there was a market in Japan for inexpensive motorised two wheeled transport. By the mid 1950s he had begun to think of...

The history of the automatic clutch used in Honda's Super Cub motorcycles can be traced back to the 1940s. Soichiro Honda's...

C90 Engine
Securing your site with an SSL Certificate

Securing your site with an SSL Certificate

If you want your website to use HTTPS you'll need an SSL certificate. Read on to find out what this all means, starting with a bit of history. HTTP When Tim Berners Lee launched the first ever website in 1991 it was accessible using a protocol called HTTP (Hypertext Transfer Protocol). The protocol...

If you want your website to use HTTPS you'll need an SSL certificate. Read on to find out what this all means, starting...

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Monitoring Amazon Lightsail Instances
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Monitoring Amazon Lightsail Instances

Right, you've got your server up and running and it is being backed up regularly.  Your next job as an amatuer server administrator is to put in place some monitoring and logging capabilities so you can be notified in case it stops working. Resource monitoring The good news if you are using Amazon...

Right, you've got your server up and running and it is being backed up regularly.  Your next job as an amatuer server administrator...

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