Author Topic: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE  (Read 22112 times)

Offline hairygit

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #15 on: October 02, 2017, 09:59:18 PM »
Maybe that's what NGK recommend, rightly or wrongly!

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #16 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. I do recall that a bike going past your house when they weren't fitted made the television go a little snowy and you'd get lines across the screen, that was in the days of 625 lines on TV.
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Offline mike the bike

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #17 on: October 02, 2017, 10:41:07 PM »
It affected the 405 line sets rather than the 625 line for technical reason which I've forgotten about.  Something to do with the way the luminance is modulated onto the carrier wave.
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Offline AshimotoK0

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #18 on: October 03, 2017, 12:31:10 AM »
Metal shrouded caps are resistive ...  some are 5k Ohms , some are 10k Ohms.
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Online K2-K6

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #19 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.

Offline kevski

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #20 on: October 03, 2017, 08:42:04 AM »
Oh dear Julie, it looks like your thread has been taken over by the resistance😊

Offline AshimotoK0

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #21 on: October 03, 2017, 08:43:40 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.

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.
“Alright friends, you have seen the heavy groups, now you will see morning maniac music. Believe me, yeah. It’s a new dawn.” Grace Slick, Woodstock '69 .. In the year of the Sandcast.

Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #22 on: October 03, 2017, 08:55:35 AM »
Oh dear Julie, it looks like your thread has been taken over by the resistance😊
Very good Kevski  ;D ;D ;D
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #23 on: October 03, 2017, 09:35:19 AM »
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.

Offline MrDavo

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #24 on: October 03, 2017, 09:35:33 AM »
To hijack a hijack.....

I seem to recall the metal shrouds were fitted as the GPO at the time complained if they weren't fitted they caused interference.

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?
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Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #25 on: October 03, 2017, 09:43:21 AM »
To hijack a hijack.....

I seem to recall the metal shrouds were fitted as the GPO at the time complained if they weren't fitted they caused interference.


Keep us posted on the rebuild Julie, has Graham sold you an engine stand yet?
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 😭😭
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline orcadian

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #26 on: October 03, 2017, 10:08:38 AM »
That's bad Julie,
Tool hire and workshop space charges - Trig offered me overnight accommodation for next years C90 trip to Deutschland - unfortunately not passing your place - but he didn't mention CHARGES 🤓
Looking forward to seeing inside the motor,
Ian

Offline BigAl (Alan)

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #27 on: October 03, 2017, 10:29:31 AM »
Very much looking forward to the engine work Julie,  gear boxes have always been some thing of a 'black art' to me.
Hijacked thread, as Ash mentioned the H1/H1A with CDI ignition was a big problem for Kawasaki in the USA 1968/69. I understand that the imported Euro versions thereafter where H1B with points ignition.
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Offline paul G

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #28 on: October 03, 2017, 12:26:21 PM »
That's bad Julie,
Tool hire and workshop space charges - Trig offered me overnight accommodation for next years C90 trip to Deutschland - unfortunately not passing your place - but he didn't mention CHARGES 🤓
Looking forward to seeing inside the motor,
Ian
He just sends the invoice later  ;D ;D ;)
Come on Julie the top end should be off by now.
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Offline Nurse Julie

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Re: CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE
« Reply #29 on: October 03, 2017, 01:07:21 PM »
That's bad Julie,
Tool hire and workshop space charges - Trig offered me overnight accommodation for next years C90 trip to Deutschland - unfortunately not passing your place - but he didn't mention CHARGES 🤓
Looking forward to seeing inside the motor,
Ian
He only charges me for workshop facilities Ian....no one else
Accommodation is FOC to everyone....including me  ;D ;D
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

 

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