SOHC.co.uk Forums > CB500/550
Partially Restored 74 CB550
McCabe-Thiele (Ted):
Is that the left side switch Dave ? - I will check mine for clearance.
davidcumbria:
No Ted it’s the starter button on the right side. I was wiring it up today and have routed the black live feed to the lower part of the switch ( yellow red ) which is further away from the handlebar so the green red wire you can see only becomes live when the button is pressed as opposed to all the time lessening the risk. Also managed to get some shrink wrap over the solder ball area in the photo and some insulating tape round the handle bar close to it.
As an aside I also fitted a new aftermarket chrome headlight surround from CMS. I know there have been problems with some aftermarket not fitting but this is perfect so I’m chuffed about that.
McCabe-Thiele (Ted):
Thanks Dave that's interesting.
Looking at my build notes my starter button wiring is Red/Yellow trace and black at the switch.
I will check & add insulation if needed.
I thought my starter button earthed the solenoid - it was ages ago so probably not, if it does I do not think the starter operating when the engine is running due to an earth fault would be a good thing.
davidcumbria:
Bike is at the first test rides stage and not running as well as I’d like. It starts and idles well and doesn’t need choke after firing up. It sits at a steady 1100 rpm but if left will all of a sudden die down to say 700 rpm where it runs along ok for a while before stalling if I don’t pick it up on the throttle. Revving in neutral it picks up cleanly. Easy to set the idle at say 1200 using idle stop at which it is very steady but 1000 rpm sounds a better idle speed to my ear.
On the road it is prone to hitting a flat spot when setting off and stalling if not careful. Once moving it tootles along ok at 1.5 to 3k on a steady light throttle. The pick up from light to medium throttle is the main problem - definite stuttering and sometimes misfiring severely enough to be like an electrical fault. Haven’t done much above 3k but it does seem to pick up more smoothly from here.
Plugs are ok to good on2,3,4 but quickly sooty on 1. Obviously a richness problem there but I wonder if that alone on 1 cylinder would cause the stuttering.
. Carbs are not overflowing. Timing rechecked with strobe. Is advanced siginificantly off static mark F by 1100 rpm but moves close to F when revs drop to 700 rpm. As revs rise 1/4 2/3 full advance marks line up, probably not much over 2k. Dwell the same for both sets with gap in range.
I’m a bit concerned about my ht leads which despite trimming don’t seem to want to screw up very tight on the caps so will have another look at that but would have thought this might cause problems at higher revs or starting which doesn’t seem to be problem.
Air screws set at 1.25 turns out -again I’m not sure if this adjustment could cause or resolve the stuttering but willing to try.
Will swap the plugs around to see if the sootiness moves.
Will check the carb sync
Lastly will reluctantly remove the carbs ( 105 main, 40 pilot, middle slot needle ) in case there is a problem with float level, new pilot circuit blockage or mistaken needle position. Has a delkevic 4-1 exhaust system. Pilot jet fuel and air circuits clean as a whistle when I rebuilt the carbs. The needle and jets are cruzinimage aftermarket but I looked at them very closely and could see no dimensional difference to the ones I took out, which were not marked keihin in any case.
Any thoughts of suggestions welcome. Despite this I have already got a sense that this is going to be a very satifying bike to ride smooth, nimble and torquey.
Bryanj:
Im sure those jets are big
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