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5

Background You have two coils on that motorcycle. One coil is for cylinder 2 and 3 the other is for cylinder 1 and 4. It utilizes what is known as a wasted spark system, the spark is fired off on TDC compression and TDC exhaust strokes. You apparently have an issue with one of your two systems. Each system, as you probably know, is comprised of two ...


4

Don't know about the CB400's fork in particular, but on some forks the bushings won't fit past eachother to allow easy removal of the stanchion ("pipe" 6 on diagram) from the slider ("case", 19 on diagram). Here's a partzilla diagram of a CB400F fork. On some BMWs with SHOWA forks that I've worked on, the lower bushing (9, attached to pipe 6) won't fit ...


2

A good test if, if you're not losing coolant or having run issues, you're probably not over heating. My fan turns on after a bit of riding (~5-10 min), and that's one of the indications that it's at full run temp. Once my bikes fully warmed up , and I continue riding, the fan mostly stays on as far as I can tell. If you were actually overheating then you'd ...


1

I had a CB400SF 2011 Model and experienced a similar occurrence. Although it is possible that everything is working as intended, I would recommend checking your coolant system. Ensure there are no blockages, and there is enough coolant in the system, and that the coolant is still effective in moving heat. Check that all the valves are operating. It may be ...


1

Loss of high end performance can be due to several issues. Old gas. Old gas doesn't burn as quickly. My bike is always sluggish running through the gas that's been sitting in the tank over the winter. Not enough gas. Check the filter on your petcock. It might be clogged with rust and only letting through enough gas for lower speeds. Disconnect one of the ...


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