SOHC.co.uk Forums > CB750
CB750K0 Carburettor Problems
mick:
well it won't help can you borrow the 2 caps off your 550 and try them on your KO? see how it runs/behaves? cheers Mick.
tom400f:
--- Quote from: K2-K6 on April 05, 2014, 08:46:13 PM ---If it does have the metal type plugs caps, as the others say, they never really worked when new....nearly everyone with any intention of have the bike run reliably used NGK, two straight ones in the middle and two cranked ones on the outside cylinders.
--- End quote ---
Hmmm, I have these. They do seem to be working OK but at the very least are very ugly. Think I'll change them
K2-K6:
I'd also go along with swapping the two centre caps (new if you don't want to disturb your 550) as they shouldn't be too expensive. If you get a failure of caps at all it's usually these two as if they have been used in the wet anytime before they take all sorts of road crap from the front wheel.
Unsure if you've taken them off the leads, but if not they will ordinarily unscrew from the HT lead and just turn them until they detach......then reverse for the new ones.....make sure you use the new rubber covers that go on the leads first and prevent moisture from entering the feed end of the cap.
I like to find a reason that could be the cause before spending money in the hope of curing something, bringing these back to spec will either get you going or at least take a faule out of the equation to see other things a bit clearer. They certainly have the scope to give the problem you've described.
let us know how you get on.
tarmac:
those 2 centre plug caps would certainly give you the problems you mentioned,....those were the 2 culprits
that gave me grieve,...in fact I am looking at them now,....one has 2 cracks at the top under the rubber hat and is burned black,and both have corrosion on the screw connecters,...
regards ,,terry
Steph550:
Unfortunately it looks like we're back to square one.
Changed the centre plug caps to brand new NGKs which work fine. However, Nigel (my other half) rode the bike yesterday and it's no better at all... He was really struggling in traffic and pulling away from junctions. ::)
Looks like we may be back to a carburation issue.
Steph.
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