SOHC.co.uk Forums > CB350/400
A couple of "tune up" questions...
Mikep328:
Yes. I tried to take pics of it but it's too small to be really able to see but the bent one has some holes that are not round, they are quite egg-shaped. it's as if the jet had been screwed in with something stopping the tip from moving forward so it buckled.
Oddjob:
What size is stamped on it Mike?
Mikep328:
40 and is identical to the other three...except for being bent! :)
Mikep328:
FWFW - In cleaning all the passages with guitar strings I think I figured out what might have happened to that pilot jet. There are two fittings on the carb that the pilot jet can screw into. One is the actual fitting for it, the other has a blanking plug. Which is which (plug or passage) is determined by whether it's a 1-2 carb or a 3-4 carb. The blanking plug is far enough in where the jet can start threading in. I suspect someone did that - started screwing it in and, when the tube 'bottomed' against the plug, probably thought that the threads were just a bit buggered and continued screwing it in. Before realizing they had installed it in the wrong fitting, the jet was distorted. Of course, I can't say for sure that that happened but it would cause exactly the damage that exists and I can't think of any other way the damage could occur.
K2-K6:
Sounds entirely feasible, agree that it would likely be something of this direction that could compress that section with holes in it.
I'm amazed that for a relatively mundane production item, these carburettor, that they are so finely resolved in design and production tolerance, all made some considerable time ago too.
They really are very very accurate in their manufacture and provide extremely precise metering of fuel for the correct response in running these engines. It's generally when first working on them that a recalibration is needed to just how small a fault can produce errors in their use. I doubt you'll be the last to have to go into them again in a process of getting fully sorted, that's quite usual from experiences on here ;D
They are quite a marvel really, and hopefully you'll have got to the reason why there's glitches in power delivery.
Quite worthwhile in working through them really, hopefully productive when you next run them as well.
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