SOHC.co.uk Forums > CB350/400
I think the slides are in the wrong bodies
Cappodimonte:
Hmmm! Tend to forget not everyone is a MotorVehicle Technician as easily back in the day. I did have my 400 run on 2 cylinders and noticed the performance drop off straightaway, cause was the yellow wire to the coil disconnecting.
Thank God Honda strap down Fuel Tanks with rubber which is quickly detachable, my BSA Bantam stopped on me one night 3 miles from home in the dark, pushed it all the way home to find next morning the bullet connector to the contact points had come apart, having a British bike kept you fit.
McCabe-Thiele (Ted):
--- Quote from: Cappodimonte on September 21, 2022, 09:17:29 PM ---Hmmm! Tend to forget not everyone is a MotorVehicle Technician as easily back in the day. I did have my 400 run on 2 cylinders and noticed the performance drop off straightaway, cause was the yellow wire to the coil disconnecting.
Thank God Honda strap down Fuel Tanks with rubber which is quickly detachable, my BSA Bantam stopped on me one night 3 miles from home in the dark, pushed it all the way home to find next morning the bullet connector to the contact points had come apart, having a British bike kept you fit.
--- End quote ---
In my defence I had never ridden the 400 before the rebuild - eventually the penny dropped with a combination of popping & banging - plus two cold exhuast pipes.
Eldrick:
--- Quote from: Nurse Julie on September 21, 2022, 03:54:54 PM ---Are all the exhaust headers the same temperature, ie, equally bloody hot when you've been riding?
--- End quote ---
No is the answer to that, 1, 2 and 4 are too hot to handle and 3 is hot but not nearly as hot as the others.
So, can't rule out spark plugs just because they are new, so I will swap plugs from 3 and 4 around and see what I get. Failing that as the problem is it 'just' going to be the HT lead or plug caps? I did re-set the gap on and clean the plugs when I took the carbs off. All plugs were a bit too dark but I expect that to change when I balance the carbs.
I guess it could be timing or valve clearance on #3 since I am quite sure the throttle slide does move freely as checked the play on them all when the carbs were off. All fore rise and fall when I engage the throttle manually and all the butterflies open and close too.
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update
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I just checked the plugs, #3 is still shiny and swapping it with #1 (which is black) made no difference. I then took the HT lead from #4 and connected that to #3, (no other leads are long enough to swap about) and #3 pipe got proper hot like it should.
I guess I need to do something with one or all of my HT leads then, but what?
McCabe-Thiele (Ted):
Once you have eliminated the Sparking you may have to look at fueling. If valve clearances are good then I would check the float level for the cooler cylinder.
Eldrick:
--- Quote from: McCabe-Thiele (Ted) on September 23, 2022, 11:55:23 AM ---Once you have eliminated the Sparking you may have to look at fueling. If valve clearances are good then I would check the float level for the cooler cylinder.
--- End quote ---
I don't think I have eliminated the spark, I think #3 is sparking sporadically. Putting #4 HT lead on #3 made it spark (the down pipe was hot) properly. That does not meaan the coil is bad tho because #2 fires normally. I don't know enough about the wiring to #2 and #3 to safley say the coil is good or bad, I just think that the HT lead from the coil to #3 is at fault.
I suppose I could see if #3 lead will reach to #2 and see if it sparks there. if not, then I would be more certain that the lead or plug cap is at fault.
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