SOHC.co.uk Forums > CB350/400
A couple of "tune up" questions...
Mikep328:
Carbs are off, back at the house... One of the pilot jets was partially clogged so cleaned all with my jet cleaning tool (guitar string).
One of the pilot jet's emulsion tubes is slightly bent. Not sure how it could have gotten that way...wondering if that could have any effect on fueling. Are those jets available individually or only as a carb repair kit?
McCabe-Thiele (Ted):
If you need a 400 emulsion tube I have a set of good used ones PM me if I can be of help.
K2-K6:
--- Quote from: Mikep328 on September 18, 2023, 12:41:16 PM ---Carbs are off, back at the house... One of the pilot jets was partially clogged so cleaned all with my jet cleaning tool (guitar string).
One of the pilot jet's emulsion tubes is slightly bent. Not sure how it could have gotten that way...wondering if that could have any effect on fueling. Are those jets available individually or only as a carb repair kit?
--- End quote ---
Definitely....it's fundamental to how the fuel is distributed within the oxygen carrying air volume that's just been ingested from intake stroke. The better (smaller droplets and more even distribution) the fuel charge has, then the more consistently linear the burn characteristics are when the spark happens.
If the emulsion tube has restricted abilities to "atomise" the fuel into droplets that are fine enough to be optimum, then that cylinder has difficulty in completely burning each and every firing stroke.
Obviously you the rider then feel this stumble as that cylinder doesn't contribute regularly to the output, and you either have to close or open the throttle to get it away from that characteristic.
Mikep328:
Thanks! Just to clarify since I used the wrong term in my previous post...
The "slow jet" is apparently the correct name for the item I called a "pilot jet." The tubular portion of the slow jet with the holes in it is the bent part to which I referred. https://www.davidsilverspares.co.uk/CB400F-SUPER-SPORT-FOUR/part_3316/
Oddjob:
Just because DS refers to it by that name doesn't mean it's right. I've always referred to it as either the idle jet or the pilot jet. I think slow jet is more of an American term.
Emulsion tubes are the ones above the main jet, lots of really small holes in them as a rule.
I think I'm right in thinking you mean the emulsion looking type tube on the pilot jet that's bent.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version