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...
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...
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...
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...
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...
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...
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...
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...
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...
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...