Author Topic: Keiths 400/4  (Read 42585 times)

Offline Coppertop1234

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Keiths 400/4 fuse box
« Reply #75 on: June 01, 2026, 07:03:42 PM »
Decided to play with fuse box today and make a blade fuse replacement.

Pic of finished blade fitted to bike and working all ok

Cheap enough to buy at 6.00 plus a couple of quid for spades

all wires soldered on blade fittings,i think with a bit of messing i could make the blade fusebox fit inside the old fusebox housing.

thats going to be version 2 i think

« Last Edit: June 01, 2026, 08:34:02 PM by Coppertop1234 »
I Love Tinkering with Old Classics
1970 Mobylette 50cc  
1972 Honda Cb175
1974 Yamaha Rd250  
1962 Triumph 650 Bonneville
1972 Norton Commando
1978 Honda CB400/4
1976 CB750F1 
1976 Suzuki GT750 Kettle
1978 Honda CB 750 F1 
Married Life No Bikes for a while then
1975 CB Honda 400/4 Restoration
1976 Kawasaki Z650   Restoration
2002 Suzuki GSX1400
1976 Honda cb750F1  Restoration
1978 Honda cb750 F1 Restoration
1977 CB 250 Dream    Restoration
1977 CB400/4  - The last one - Restoration

Offline Coppertop1234

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Re: Keiths 400/4
« Reply #76 on: July 23, 2026, 06:11:35 PM »
Link to bike finished on you tube
Only a short clip of her running steady at 1200 tickover

https://youtu.be/tCL0FjgBY5c?is=cVGDBP_qB1-c4qzx
I Love Tinkering with Old Classics
1970 Mobylette 50cc  
1972 Honda Cb175
1974 Yamaha Rd250  
1962 Triumph 650 Bonneville
1972 Norton Commando
1978 Honda CB400/4
1976 CB750F1 
1976 Suzuki GT750 Kettle
1978 Honda CB 750 F1 
Married Life No Bikes for a while then
1975 CB Honda 400/4 Restoration
1976 Kawasaki Z650   Restoration
2002 Suzuki GSX1400
1976 Honda cb750F1  Restoration
1978 Honda cb750 F1 Restoration
1977 CB 250 Dream    Restoration
1977 CB400/4  - The last one - Restoration

Online Johnny4428

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Re: Keiths 400/4
« Reply #77 on: July 24, 2026, 07:41:43 AM »
Very worthwhile mod to do. Have fitted spade fuse box on 750 need to do the 550 next. Countless main fuses blown due to crap springy contact thingys!
1952 Cymoto on Triumph bicycle.
1961 Matchless G3
1974 Honda CB550K1
1978 Honda CB550K3
1999 ST1100 Pan European 50th Anniversary.
1975,1984,1986 Honda C90’s
1973 Honda CB750K3
1977 Honda CB550 (almost)

Offline Coppertop1234

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Re: Keiths 400/4
« Reply #78 on: July 25, 2026, 04:44:58 PM »
Well mines all sorted so now we can start on sons.

He had a bottom end oil leak where someone had overtightened a wrong size bolt and tried to fix with epoxy.

we have a full spare engine untested with all new insides but stripped head and rocker bolts
A full engine with oil leak at bottom but runs fine
Another engine stripped

So today engine with oil.leak out of frame and head off
Untested engine stripped and head and barrels off
Rings new barrels all fine refitted to bottom.end
Good head refitted and rebuilt 
Electronic ignition transfered and timing checked over ready to refit
2 rocker bolts were sheared redrilled and tapped out
Engine ready to refit  tomorrow
Unfortunately its over to son as I am away for a couple of weeks but sure I will get a message its up and running all been well by mid week. Or maybe tomorrow



« Last Edit: July 25, 2026, 06:16:26 PM by Coppertop1234 »
I Love Tinkering with Old Classics
1970 Mobylette 50cc  
1972 Honda Cb175
1974 Yamaha Rd250  
1962 Triumph 650 Bonneville
1972 Norton Commando
1978 Honda CB400/4
1976 CB750F1 
1976 Suzuki GT750 Kettle
1978 Honda CB 750 F1 
Married Life No Bikes for a while then
1975 CB Honda 400/4 Restoration
1976 Kawasaki Z650   Restoration
2002 Suzuki GSX1400
1976 Honda cb750F1  Restoration
1978 Honda cb750 F1 Restoration
1977 CB 250 Dream    Restoration
1977 CB400/4  - The last one - Restoration

Offline Bryanj

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Re: Keiths 400/4
« Reply #79 on: July 25, 2026, 06:05:59 PM »
Lower front engine mounting bolt by any chance? Usually when case guards removed and long bolt put back

Offline Coppertop1234

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Re: Keiths 400/4
« Reply #80 on: July 25, 2026, 06:40:25 PM »
Yup you got it in 1
I Love Tinkering with Old Classics
1970 Mobylette 50cc  
1972 Honda Cb175
1974 Yamaha Rd250  
1962 Triumph 650 Bonneville
1972 Norton Commando
1978 Honda CB400/4
1976 CB750F1 
1976 Suzuki GT750 Kettle
1978 Honda CB 750 F1 
Married Life No Bikes for a while then
1975 CB Honda 400/4 Restoration
1976 Kawasaki Z650   Restoration
2002 Suzuki GSX1400
1976 Honda cb750F1  Restoration
1978 Honda cb750 F1 Restoration
1977 CB 250 Dream    Restoration
1977 CB400/4  - The last one - Restoration

Offline Coppertop1234

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Re: Keiths 400/4
« Reply #81 on: Today at 03:52:04 PM »
Just as I thought up and running not bad for a 24hr rebuild
From memory running in was 600 miles below 6k revs?

https://youtube.com/watch?v=vT9ElP2CqKc&is=5WqoHUDKKq6WzQEr
« Last Edit: Today at 03:55:02 PM by Coppertop1234 »
I Love Tinkering with Old Classics
1970 Mobylette 50cc  
1972 Honda Cb175
1974 Yamaha Rd250  
1962 Triumph 650 Bonneville
1972 Norton Commando
1978 Honda CB400/4
1976 CB750F1 
1976 Suzuki GT750 Kettle
1978 Honda CB 750 F1 
Married Life No Bikes for a while then
1975 CB Honda 400/4 Restoration
1976 Kawasaki Z650   Restoration
2002 Suzuki GSX1400
1976 Honda cb750F1  Restoration
1978 Honda cb750 F1 Restoration
1977 CB 250 Dream    Restoration
1977 CB400/4  - The last one - Restoration