Please note that the posts in this blog are in reverse order, so the newest posts are at the top and the oldest posts are at the bottom. You can enlarge most of the photos by clicking on them.

Saturday, September 17, 2011


I tried to start the bike today and she just wasn't having it, so I attached the battery-booster and she spluttered into life once more. Once the engine was warm, it ticked over steadily but wasn't revving "perfectly". There was a slight hesitance.

Anyway, I then decided to take some resistance readings from the alternator connectors. They were as follows...

White-Blue = 5.2 Ohms
Green-White = 336 Ohms
Green-L/Blue = 138 Ohms
Green-Pink =  14.9 Ohms
White-Earth = 338 Ohms

So they all seem within range. The surprise came when I took a voltage reading from the white and blue connectors with the engine running - both were around 30odd volts instead of the 90-100v.

Just as I sat there shaking my head, the carb overflow pipes started dripping petrol onto the floor .

I then spent time replacing the Nippondenso CDI for another one, but it made no difference. I checked all the connectors in the ignition circuit, cleaned them with switch-cleaner, checked earths, etc, etc, etc.

What now? I think I'll put the original stator back in for a start, because that looked like brand new and all resistance reading are perfect. The carbs will obviously have to come off again to cure that damned float-valve leak too. After that, I think I'll commit hari-kari!

1 comment:

Loren Bosch said...

Hi Tom, great blog. I'm in the process of restoring/conveying a '78 CB250n and I'm not getting spark. The stator is my only remaining suspect. I haven't been able to find the resistance outputs for the stator anywhere. Could you tell me what they are?

Bike Details

Honda CB250N Superdream
Reg No : ORH746W (ORH 746 W)
Reg Date : 1980
Orig Colour : Blue
New Colour : Black
Current Owner : Tom McQuiggan
Current Location : Horwich, Bolton, UK.