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Messages - Northy

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1
CB350/400 / Re: Odd spark problem
« on: January 26, 2020, 12:12:48 PM »
Just done 40 odd miles and no issues .... so it "fixed" .

However as lobo says   "gut feeling is you’ve a gremlin rather than a localised heat issue. "   

Next step I suppose is to remove the insulation tape to finally prove it. That will have to wait ...need to clean the bike now, rather grotty roads out there today. 

2
CB350/400 / Re: Odd spark problem
« on: January 24, 2020, 12:49:49 PM »
Ok had ride in the freezing cold with the ally points cover on but with insulation tape on the inside, managed 16 miles running Ok.  Should have done some more miles but it was cold !!  ::) so it may not have got "hot" enough to be proper test.

So its appears for some reason when warm/hot the points sort out against the cover ?? this seems odd to me.

However one bit of logic is that points for 2/3  cylinder are closer to the cover than 1/4 and that's the one that fails.     

So I've  learn't something new .......or the garage fairies are having a laugh.  ;D

3
CB350/400 / Re: Odd spark problem
« on: January 20, 2020, 03:40:05 PM »
Yes there's  a grey coating on the inside of the original cover .Original I thought this was just is grey paint to save on chrome.
Appears Honda knew something !!!

So will add some insulation tape to inside of the ally and take it for spin ........and report back.   


 

4
CB350/400 / Odd spark problem
« on: January 19, 2020, 03:57:45 PM »
I've  think I sorted it .......but its a weird one (Northy what hell are you talking about !!  ::) ::) )

Well for few weeks I've had this problem with the special 400/4 . After about 8/10 miles it would lose number 2/3  cylinders with no spark.The more you used the revs the less miles you did, so heat related? however wait 5 minutes and it runs Ok on all four, for about 4-6 miles.
This was PIA as it fixed it self before you got to testing things.   >:(

But Coil I hear you say ! ::) ::)

So replaced the new DS one with an old one ..same result
Replace both coils and leads/cap from my other 400f ...same result
Swapped plugs ...same result 
Replaced the condensers from my other  400f, clean points (again) ...same result
Checking wiring/connecting ...all seem ok
Not water related as only used in the dry
Thinking of making up a new wires from the points to coil or pleading for help on the SOHC forum  ;D ;D

Then today I had a thought (yes the 2 brain cells clicked in) this followed yet another run of 10 miles, then it goes onto 2. What haven't I changed and what have I changed. As the other 400/f with the swapped out part runs fine.

Well it took 1 minutes to fix it ......I managed 22 miles with not even a misfire , lots of revs etc (by which time it was getting colder )

The possible culprit .....

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I don't know why but replacing this with the standard chrome points cover sorted it. I had fitted it a few months back. 

Its not clearance issue but the ally one does get a lot warmer then the chrome one .This could point to something (points/condenser) breaking down under heat. The final test is refit the ally one and see if I can make 22 miles. (way too cold now for that )

So I think its sorted but its an odd one .....anyone had issues like this ? 



 
 
 
   




 

 

5
CB350/400 / Re: Which Exhaust System
« on: December 11, 2019, 07:07:16 PM »
The Delkevic system will fit  the f2  frame but you have to make up  your own mounting bracket but it easy to do.
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Its tucks quite tight [ Guests cannot view attachments ]

Its a nice system and fits well, if a little on the loud side.
 

6
CB350/400 / Re: 1978 cb400f2
« on: September 24, 2019, 10:32:04 AM »
Possible the carbs have gummed up and its fuel starvation......or the air filter blocked and its over fueling.

I'd check my plug colour and go from there. If it revs freely in neutral then I like to think the timing was Ok.   

7
CB350/400 / Re: Hesitant revs below 3,000 RPM when hot.
« on: September 15, 2019, 07:45:46 PM »
Oh just had other thought (like you do ).
It could be the O rings on the main jets are  worn or not sealing properly , therefore making it run rich . So if the new air filter doesn't cure it that would be my next port of call.
Does mean the carbs will have come off but its not bad job if know the correct procedure.

However your issue is at low revs so suspect not ....  (make up mind  Northy! ......I talk to myself lot !) :o ;) 

8
CB350/400 / Re: Hesitant revs below 3,000 RPM when hot.
« on: September 02, 2019, 04:47:37 PM »
Julie , they are set to 1, 3/4 turns , i have noticed that I don’t have to use much choke to start the bike from cold . I originally bought this set of reconditioned carbs from Gerben . Might try changing plugs and air filter.

They should be 2 turns (+/- 1/4 ) so close to standard but I'd screw then out a bit, try 1/4 at a time , so could be a easy fix. 

9
CB350/400 / Re: Video...CB400/4 with Delkevic fitted.
« on: September 02, 2019, 04:44:15 PM »
I have the same exhaust ..tad noisey for me

However getting used to it now , its a nice system and fits well (once you've made a bracket for the silencer bit)

The system is designed to fit the F1  model , so on F2  the bracket they supplied will fit properly  but its easy to sort out

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10
Project Board / Re: CB400 Four special (Mr Sinx II )
« on: September 02, 2019, 04:32:16 PM »
Oil leak now sorted

Ok I cheated by putting some TBS (Thermal Bonding System) around the seal. Its a thermal epoxy glue which works up to 120c so that should hold for a few years ...fingers crossed.
 

   

11
Project Board / Re: CB400 Four special (Mr Sinx II )
« on: August 31, 2019, 01:54:50 PM »
OK folks bit of an unpate .

Bike is now run in with a some 600 miles on the clock ...might not be long enough for some but I'm not  red lining it yet

Still smells hot but the cooler weather has helped and the paint on engine is slowly cured (did put a lot on there ) trouble is dried with bit of dust stuck onto it

2 rear punctures ,  one 1/2 mile  from home (nail) the other 20 mile from home (new screw) and was 3 hr wait in the heat

Replaced the rear shocks with some softer ones much better but the front damping is poor and soft.

Front brake still not fully bedding in, even took them off to check ..too hard a material may be but better than standard set up. G getting better but does show up the soft front end. 

Piccy of revised rear mudguard in plastic replacing the S/S  item  (lost a good kilo there) and slimmer softer shocks
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Have a dimple in my seat .....odd talking point but its where the foam was injected in at the factory

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Added some bling to engine (thanks Peter) finned covers

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The engine is going fine, really takes off and revs freely and 60-80 acceleration is impressive. Think I've got the jetting about right with a smooth clean pick up .That exhaust does have great rasp at 6 k ...still tad to loud.

The gear box or should I say the rear sets are making for a slow down shift. I've adjusted them and can't quite get it balanced, adjust one way and upshift are the issue. Think the arm on the rear sets is too short and I'm not get proper leverage (or weak spring in the selector mechanism)

However the biggest issue I have is a tiny oil leak from the drive sprocket oil seal. Not from the shaft but between the case and the seal and its bloody annoying. Its only a few drips every 50 mile but still should be happening . This seal was new (all new seal/etc in engine) so why should leaking between the casing, its not distorted. Can't over pressurised in there.

The seal has a locating stub which means removing to replace is a pig split the cases or refit one with the location stub ...anyone done this . For time being I going to try some sealant around it.

So I've the forks to play with , tidy up some of the wiring and oil leak to sort out
       

12
CB350/400 / Re: Hesitant revs below 3,000 RPM when hot.
« on: August 09, 2019, 01:18:46 PM »
Actually could be running rich , check you plug colour and air filter first.

The air filters don't have much space around them and any slight restriction i.e.  dirty air filter seen to have huge effect on running.

Oddly just had issue with one of mine, thought the air filter was fine but would splutter at  2.5-3 k and was running rich , replace the air filter all fine.

As an side I pulled the dirty pattern filter apart. The inside of the paper/cloth had a waxy feel to it and also quite hard. So although the outside looked clean, the inner bit was causing the restriction. Its was a new filter but had been in a box for 7yrs or so,so over time had gone off, if that's possible or reacted once fitted to vapours. Had me stumped for while.   

13
Project Board / Re: CB400 Four special (Mr Sinx II )
« on: July 07, 2019, 05:23:15 PM »
Thanks for the comments and I think this will be work in progress .

Still very aware it runs very hot .... so just given it some short runs in the cooler parts of the day. I was so paranoid had to check it oil was getting to the top end by removing a tappet cover ....its was and duly ran oil all over the engine. If there was an issue it would have gone bang or screeched to a halt by now. Thinking of putting 20/50w oil in there,currently using 10/40 but it semi syn and well runny when warm.

Plugs are the right colour and the thing is slowly getting better ie not getting so hot so quick. Engine pulls really well. Everyone loves the pipe but still too noisy for me   

Got puncture in rear 1/2 mile from home today ..nice new nail   ::)   rather put a hold on the running in as only had front tubes in my stash.
Also one side panel cracked at the top , was secondhand to start with.   

Modified the rear wheel spindle , fitted a longer one due to dresda box section swing arm being fatter , still tad to long 

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Then made simple stop for the rear brake lever, its just a bit ally with offset holes so can used as a cam.

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Next up the rear under tray will chopped back , doesn't need to be that big as its not carrying any weight and paint outside black.

Brakes slowing getting there.

Its making me smile  :D  especially when a guy you don't recognise, says "Hi, Northy I remember being chased by that bike back in 80's" not seen him since the early 80's but its that bike they remember.

Or maybe my 40 yrs old oxblood red leather jacket, which has been adjusted to fit again (may put few pounds on over the years)


 

14
Project Board / Re: CB400 Four special (Mr Sinx II )
« on: July 02, 2019, 05:19:30 PM »
Well  from  pile of bits , frame , spare engine and wallet shrinkage bits .......Mr Snix  (mark II) . Still things to sort out.

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Running smoother on standard jets, with proper coloured plug which is odd as I'm running pod filter (albeit oiled) Pulls cleanly up to 5k .....running it in , honest !  ::)
Does "smell " warm, combination of tight engine, engine paint going off and warm weather
Brake still feel very wooden.
Front end is too soft
No oil leaks ....had caught the rocker box gasket


There are number things which have arisen since adding all the bits together and riding it.

The 2:4 seat is slightly narrower at the front so some bits on the tank I thought would be covered up ...aren't.
The cockpit fairing is mounted to the headlight bracket which is rubber mount so it wobbles. 
The Speedo is a pattern Cb400n part and is too long (brake line also tad too long as well) further highlighted by soft front end
The massive number plate has to go (looks like a air brake )

Ohh don't just run the engine breather tube into a plastic bottle inside the unused air box , you get steam rising from under the seat.

So is it finished ...nah never , the original one took a number of years to perfect .Then it got used,abused and end up used a commuter.

This is an attempt to go back in time , ie what we did the 70/80's with bikes, we all modified them. I could have put all the modern stuff on it but I might as well got a 1998 honda CB400R (supersport) and tarted it up but where's the fun in that  :-) (ohh that  might be a interesting project  :o :o ;) )_ 

Needs some logos, decals, a clean to remove grubby mit marks & dust, tank needs rubbing down and need to put some more wadding in the exhaust . Its too loud for me so at 6k its going to howl a lot.   

 

 

 
 

     

15
Project Board / Re: CB400 Four special (Mr Sinx II )
« on: June 24, 2019, 03:43:48 PM »
OH the  funny gaps in the tank paint work , luckily I had something to cover them up with  ::) ;)

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Needs lacquering  and going off etc ......thats another  week of spray ,spray,waiting, rub down, spray , more spray , more rubbing and waiting.


 




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