SOHC.co.uk Forums > CB350/400
Smokey rebuilt 350
hairygit:
Give it a while to settle down Roy, it's possible that number 4 exhaust has residual oil in it that will take a while to completely burn away, but it will still smoke while it burns it all away, it needs to get the pipes really hot for some time to remove all traces.
royhall:
Possibly, as I have only been around the block a few times. It's not legal until Sunday as the MOT ran out whilst it was apart. Will take it a good run next week to see what happens. It will get used a bit harder this time as the bottom end should be loosened up by now.
But I would still like to borrow a good set of 350F carbs just to eliminate the carbs from the problem. I will gladly pay the postage there and back. I have just checked the new plugs and they are black and No.4 was wet. It smells like petrol but a bit hard to tell. Looks to me like it's running very rich.
I am at least happy now that the engine is back together as well as it can be, it would not have been long before the Cruzinimage head gasket let me down.
K2-K6:
What a pain Roy, but hopefully you're closer to eliminating all the things until you get on top of it.
As Hairy says, it's worth running a bit more to evaluate the pipe and if it will clean up . Although that black plug is worrying and as you say, suggests you've got too much of something burning in there.
What about getting a emissions test for each pipe once it's warmed up at mot test station. If you can get a decent readout for each then at least you can make a more fundamental judgment as to what's coming out of that cylinder versus the others.
Or, pull the carbs and switch the main jet from that #4 over to another cylinder to see if the problem moves?
flatfour:
I've most of a set of 350/4 carburettors if it helps - some parts (I can't remember which)) were removed from one or more of them long ago, however they are substantially complete with all linkages, springs etc. in place.
If you need them, let me know.
royhall:
--- Quote from: flatfour on May 19, 2018, 12:38:01 PM ---I've most of a set of 350/4 carburettors if it helps - some parts (I can't remember which)) were removed from one or more of them long ago, however they are substantially complete with all linkages, springs etc. in place.
If you need them, let me know.
--- End quote ---
Thanks for the offer, will keep you in mind. I have contacted Matt at Harpers Ultrasonic and he has offered to take the carbs back for another look. He's a top bloke. Will post what he finds but I am of a mind to get rid of the Cruzinimage carb kits that were fitted. Cheers.
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