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CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
AshimotoK0:
--- Quote from: K2-K6 on October 03, 2017, 08:03:39 AM ---There's a four stroke scooter ( with Valentino Rossi paintwork) that passes our house each day and trashes the TV signal, it's Freeview via an aerial.
Also the po-leece where above in a helicopter which blitzed the signal, presumably emergency rf channel transmitter.
--- End quote ---
I understand the original main aggressor was the Kawasaki H1, which in the late 60's, was the first Japanese bike to use CDi ignition as standard fitment. Lots of modern vehicles now use metal shrouded caps to reduce RFI. This is probably necessary in order to meet the stringent 'E' mark approvals for automotive electronics. I have got equipment through those approvals and I can tell you it's not fun and horrendously expensive.
Nurse Julie:
--- Quote from: kevski on October 03, 2017, 08:42:04 AM ---Oh dear Julie, it looks like your thread has been taken over by the resistance😊
--- End quote ---
Very good Kevski ;D ;D ;D
K2-K6:
That is a good one kevski :)
I do think there's more to the resistance in this motor though, it'll be interesting to see inside it when you get it apart.
The resistance increase when it was running both plugs and caps with R shouldn't really have an affect at tickover. What it does is extend the spark duration from its initial start point. This in itself doesn't do much without something to burn, so if youve got an old motor that's a bit windy and burning a little oil then you do have a source that is combustible and not controlled by the throttle slides.
That sort of mix is reluctant to fire but can be encouraged by a longer spark duration, which maybe what was happening inside this one.
It's an area they are having a punch up about in F1 as they are restricted in how much fuel they can use, but it looks as though they have been burning the oil as well. They even ran special oils in qualifying that people assume are orientated toward combustion which has been banned. They've now imposed maximum oil burn limits as well to try and prevent it.
MrDavo:
To hijack a hijack.....
--- Quote from: Oddjob on October 02, 2017, 10:34:00 PM ---I seem to recall the metal shrouds were fitted as the GPO at the time complained if they weren't fitted they caused interference.
--- End quote ---
My CB750 from South Africa still had metal shrouds on the inside cylinders, though I replaced them in search of a misfire.
Before I got a ham radio licence I was into illegal sideband CB radio. I gave up doing it from home, after I got a visit from GPO inspectors, having been stupid enough to use the radio during Eastenders, wiping out the neighbours' TVs, so I went mobile, using a 100 watt setup from my car. I was talking to a mate as I drove down the full length of Deansgate in Manchester, looking in my mirror I saw to my horror lots of little flashing lights, as I had set off alarms all the way along the street!
Keep us posted on the rebuild Julie, has Graham sold you an engine stand yet?
Nurse Julie:
--- Quote from: MrDavo on October 03, 2017, 09:35:33 AM ---To hijack a hijack.....
--- Quote from: Oddjob on October 02, 2017, 10:34:00 PM ---I seem to recall the metal shrouds were fitted as the GPO at the time complained if they weren't fitted they caused interference.
--- End quote ---
Keep us posted on the rebuild Julie, has Graham sold you an engine stand yet?
--- End quote ---
He has tried very hard to sell me one Dave but I'm too tight to buy one (typical CB400 owner !!!) This is going to have to be a quick strip/ rebuild as I'm incurring tool hire charges and workshop space charges 😭😭
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