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Messages - Ceeby-jeebies
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1
« on: November 26, 2022, 09:29:29 PM »
Turned out to be a loose stator wire. Now fine when soldered back in. Thanks to all
2
« on: November 12, 2022, 05:59:04 PM »
Thanks although it is a brand new regulator rectifier from David Silver that I fitted on Thursday
3
« on: November 12, 2022, 04:26:19 PM »
Thanks for all the suggestions. Tried everything and cleaned everything and put it all back together again, and now it’s charging better if not as per the manual, ie 12.5-12.6V at tickover and 13.3V-13.5V at 2000-4000 revs. Any more revs and the multimeter seemed to go erratic, flickering on and off with no clear reading!
4
« on: November 11, 2022, 03:24:59 PM »
Have checked earth connections, alternator connections, fuse box, bullets etc and all seem good. Problem persists sadly.
5
« on: November 10, 2022, 05:28:01 PM »
It’s an AGM battery replacing a MotoBatt AGM battery, both of right size and spec. Fully charged giving 12.7v, 12.8v.
Earth connection from battery ok, but have not checked headlamp earth.
Alternator connections prised apart, cleaned and reconnected after diodes tested ok on multimeter
Fuse holder ok but have not checked voltage there - will do
Thanks so far!
6
« on: November 10, 2022, 04:27:20 PM »
My 78 400f2 model seems to have a charging system problem and I can’t get to the bottom of it. I had a series of problems in which the battery was unable to start the bike after or during a run and also appeared totally dead at home one morning when it had been fine the day before. A multimeter showed 12.4, 12.5V at the battery when the engine was running regardless of the revs. It should be 14.5 to 15V when revving to 3000 and beyond according to Haynes.
- Subsequently I put in a new battery but after one check when it was charging correctly at about 14.5V at 3000 revs, it reverted a few days later to 12.4V, or 12.2V with the headlight on
- the multimeter showed the rectifier was ok as was the generator.
- Unable to check the regulator so I replaced it and the old rectifier today with a combined regulator/rectifier from David Silver. But the problem remains with the battery only being charged at 12.4V
- the only other oddity is that the electrics twice were completely dead (no ignition lights when I switched on).The fuses appear ok. I prised apart the ignition switch connector and cleaned it with a brass brush, and everything came back on again.
Any ideas gratefully received
7
« on: February 06, 2022, 04:58:16 PM »
 How much they cost back in the day (1975]
8
« on: September 20, 2021, 10:14:48 PM »
Thanks to everyone for their comments. Overall it looks as if polishing gives the best results, even if it’s not the way it looked when the bikes left the factory - while aquablasting also produces good results but seems then to need some other from of finishing.
9
« on: September 20, 2021, 06:26:52 PM »
Interesting - what does anyone with experience of having aquablasting or polishing have to say about the end result?
10
« on: September 20, 2021, 03:54:06 PM »
Hi, any suggestions or recommendations for what is best to bring engine casings back to original or better finish? My recently acquired F2 is looking a little the worse for wear here and there - see the photos. I’ve never had to deal with this sort of thing before.
11
« on: August 25, 2021, 03:26:47 PM »
Thanks for the suggestions. Removed the plugs and they are all blackened, so it looks like it is running rich. How is this best fixed? I’m not much of a mechanic myself…
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« on: August 24, 2021, 09:19:47 PM »
I should add that the only other thing I have noticed on the bike is that the airbox manifold chamber has a small split on both sides - I don’t know how significant that is.
13
« on: August 24, 2021, 09:02:15 PM »
Thanks for the replies. I don’t have the detail on what was done when the carbs were stripped and cleaned, only that it was last November and the bike has not done many miles since - probably only a couple of hundred. The tank looks very clean inside though. I’ll take a look at the spark plugs tomorrow - the seller said they had recently been replaced as well.
14
« on: August 24, 2021, 07:16:02 PM »
Hi to everyone. Just acquired a 78 CB400 F2 with a believed genuine 15,000 miles on the clock. Rode it 100 miles home, sadly far too much on the intimidating M25. Seems to run well apart from a slight hesitation when opening the throttle from a steady speed, and tending to cut out when changing down at slow speed. Any ideas? Has had a recent carb strip and clean apparently. I have just fitted new air filter and plug caps but no difference. Used to have an identical candy antares red F2 in the late 70s (VLP267S, where are you now?) which took me on an epic 5,500 mile tour of Europe in 1979, so the new bike is a bit of a trip down memory lane…
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