Honda C90 – adjusting valve clearance
Here are the instructions for adjusting valve clearance taken from a CT90 workshop manual (the late 1970s CT90 and c90 z2 shared many engine components): …
Honda C90 – valve adjustment and TDC
Here is what Honda have to say about valve adjustment: A key point to note is that the measurement must be taken on the compression stroke. …
Honda C90 – understanding valve clearance
Once you have the engine back together an important job is to adjust the valve clearance (sometimes called “valve lash” or “tappet gap”). The clearance …
Honda C90 – valve seals
The valves are held in place by metal guides installed in the cylinder head and on some C90s (including the c90 z2) there is a …
Honda C90 – valve removal, cleaning and lapping
The steps to remove the cylinder head so that you can properly inspect the vales is described here. The valves are held closed by springs …
Honda C90 – valve timing
Here are a few posts on the topic of valve timing and valve adjustment. Happily, since the c90 is such a simple engine, it is …
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 …
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 – carb – 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 …
Honda C90 – carb 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 …