Here are a few posts on the topic of valve adjustment. Happily, since the c90 is such a simple engine, it is a good place to learn about these automotive fundamentals. Here goes!
Disassembly
Here are the cylinder head parts for the c90 z2. As you can see the z2 has contact breaker points and...
Here are a few posts on the topic of valve adjustment. Happily, since the c90 is such a simple engine, it is a good place...
C90 Engine
Looking at the CMSL microfiche parts diagrams, the older Kowa tool kits – for example the c100 from the 1960s – contained:
* an open ended 10/14mm spanner
* 17mm and 23mm ring spanners
* a set of pliers Pliers
* a spark plug socket
* a screwdriver handle with one slotted and two cross head bits.
The kit also included...
Looking at the CMSL microfiche parts diagrams, the older Kowa tool kits – for example the c100 from the 1960s – contained:
* an open ended 10/14mm...
Kowa
Kowa Seiki has made tools for Honda since 1956, initially making their special workshop tools and going on to make the tool kits for all their bikes from the 60s until the early 2000s.
From the 1970s they also made tools for the Japanese government, Mazda, Kawasaki, Suzuki, Yamaha and Mitsubishi. Add all that production...
Kowa Seiki has made tools for Honda since 1956, initially making their special workshop tools and going on to make the tool kits for all...
Kowa
There are only a few things that can go wrong with the simple carburettors used on the Honda c90 and – once you have a rough idea of how these parts work – the fixes are straight forward and largely common sense.
A note of warning from the early workshop manuals:
Engine trouble during acceleration is caused...
There are only a few things that can go wrong with the simple carburettors used on the Honda c90 and – once you have a rough...
C90 carburettor
Fuel evaporates poorly at lower temperatures and, when the engine is cold, tends to condense on the walls of the intake manifold and cylinder making the engine hard to start.
The solution is to make the mixture richer, either by temporarily adding more fuel or by restricting the amount of air. The mechanism used on...
Fuel evaporates poorly at lower temperatures and, when the engine is cold, tends to condense on the walls of the intake manifold and cylinder making...
C90 carburettor
The idle circuit, sometimes called the pilot or slow circuit, controls the mixture of fuel and air at low throttle speeds. There are not many components involved, read on to see how they work together to ensure the engine ticks over smoothly at low revs.
Pilot jet
The orifice in the pilot jet is tiny...
The idle circuit, sometimes called the pilot or slow circuit, controls the mixture of fuel and air at low throttle speeds. There are not many...
C90 carburettor
The carburettors fitted to the C90 super cub have two independent systems for metering fuel and air, the main circuit and the idle circuit. The idle circuit is designed to control the mixture of fuel and air at low throttle speeds and the main circuit determines the mixture at higher engine speeds (you can get...
The carburettors fitted to the C90 super cub have two independent systems for metering fuel and air, the main circuit and the idle circuit. The...
C90 carburettor
Parts
The engine needs a constant supply of fuel – the parts involved are marked on this picture of the dismantled carburettor:
* fuel tap
* float bowl
* float
* float valve
Fuel supply
The fuel is fed to the tap by gravity from the tank where:
1. It passes through a filter and up through the hole marked...
Parts
The engine needs a constant supply of fuel – the parts involved are marked on this picture of the dismantled carburettor:
* fuel tap
* float bowl...
C90 carburettor
One of the first things I did when trying to get my old Honda C90 to run was to clean the carburettor, having read that it might have become clogged up with old fuel while it was in storage. I did eventually get it to run but it didn’t idle well and was hard...
One of the first things I did when trying to get my old Honda C90 to run was to clean the carburettor, having read that...
C90 carburettor
It is difficult to find an old C90 without knackered wheels and mine was no exception.
I am not sure what the wheels had been painted with but it was rock hard and there was no way they could be cleaned up satisfactorily, so I decided to replace the spokes and rims. There are three...
It is difficult to find an old C90 without knackered wheels and mine was no exception.
I am not sure what the wheels had been...
C90 chassis
I used VHT SP995 CAST Aluminium Engine Enamel Paint to paint the engine cases and wheel hubs. The cases had been repainted once before so I couldn’t really tell if it is a good match or not ( perhaps a bit sparkly? ). Apparently the original paint used by Honda was called Silver Cloud but I...
I used VHT SP995 CAST Aluminium Engine Enamel Paint to paint the engine cases and wheel hubs. The cases had been repainted once before so...
C90 Engine
The seat was a bit of a mess: despite having been repainted several times it was rather rusty on the underside, particularly around where the hand strap is fixed on (all the used c90 seats I’ve seen on ebay are the same – I suppose rain must get blown underneath and trapped between the seat...
The seat was a bit of a mess: despite having been repainted several times it was rather rusty on the underside, particularly around where the...
C90 chassis
Introduction
Honda’s Super Cub step-through motorcycle is the most successful motor vehicle ever built and a staggering number – well over 100 million – have been sold.
I was lucky enough to find a low mileage 1978 C90 for sale a few miles from where I live. It ran for about half a mile before conking...
Introduction
Honda’s Super Cub step-through motorcycle is the most successful motor vehicle ever built and a staggering number – well over 100 million – have been...
C90 carburettor
The Record Imp is the brilliant tiny cousin of the Record #74 Auto Vice.
I use my Imp constantly, it really is a very useful vice despite its small size (the jaws are only 2 1/4” wide). If you are in the UK then you can get them for around 20-30 quid on eBay...
The Record Imp is the brilliant tiny cousin of the Record #74 Auto Vice.
I use my Imp constantly, it really is a very useful...
vices
The Record 74 Auto Vice still show up for sale fairly regularly in the UK. This one was a bit grotty cosmetically but in good mechanical condition:
The only minor issue was that at some point the pin that retains the washer/spring used to hold the handle against the moveable jaw had broken and...
The Record 74 Auto Vice still show up for sale fairly regularly in the UK. This one was a bit grotty cosmetically but in good...
Record Tools Ltd
Here is a short summary of the history of the Record 52 ½ vice. You can read more about this vice here and information on the other vices mentioned can be found here.
1877-1910
The earliest quick release vices were know as "instantaneous grip" vices.
Wilson Riley and and an unknown inventor working for...
Here is a short summary of the history of the Record 52 ½ vice. You can read more about this vice here and information on the...
Record Tools Ltd
