Honda C90 – Carburettor fuel supply
The engine needs a constant supply of fuel – the parts involved are marked on this picture of the dismantled carburettor: fuel tap float bowl …
Honda C90 – carburettor float height
The level in the float chamber effects the ratio of fuel and air passed to the engine: when the level is too high the additional …
Honda C90 – carburettor drain, overflow & breather tube
There are a few other bits involved with the carburettor fuel supply: the overflow, drain screw and breather The purpose of the drain screw is …
Honda C90 – carburettor fuel and air mixture
We already saw that the basic function of the carburettor is to mix fuel and air in the right proportions before it is ignited in …
Honda C90 – carburettor main circuit
This Kehin carburettor has two independent systems for metering fuel and air, the main circuit and the idle circuit. As the names suggests the idle …
Honda C90 – carburettor idle circuit
The idle circuit, sometimes called the pilot circuit, controls the mixture of fuel and air at low throttle speeds. There are not many components involved, …
Honda C90 – carburettor choke
When the engine is cold fuel tends to condense on the walls of the intake manifold and cylinder and this make the engine hard to …
Honda C90 – carburettor – cleaning and replacement parts
There are only a few things that can go wrong with the simple carburettors used on the Honda c90 and – once you have a …
Kowa tools
Kowa Seiki have made tools for Honda since 1956, initially making their special workshop tools and then going on to make the tool kits for …
Honda C90 – tool kits
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 …