SOHC.co.uk Forums > CB350/400
Carb #2
Lynx:
Sorted :)!
I fired it up last night and balanced the carbs. Running sweetly and quieter. All four exhaust downpipes getting equally hot at idle. I wonder how easy it is to blow out the blanking balls without realising. This could be the problem for a few people complaining of poor idle and cold pipes.
I'll take it for a little spin at the weekend before stripping down the rear end for renovation. Still got those horrible clocks to do too :-\ (see Knocking Noise post).
Lynx:
I took the bike for it's first run yesterday. Not as good as I hoped. Runs sweetly at low revs but just seems to run out of steam at 5k rpm ::). I haven't looked into it at all yet. Decieded to start stripping thge clocks last night instead. Does anything commom spring to mind for anyone?
It's a similar feeling to the air intake getting blocked but I do have all the rubbers on the bottom of the seat. So it's not that.
Clem2112:
Float heights?
Lynx:
Float heights are fine. Could be the tank breather though.
Clem2112:
Heard about the blocked breather issue... with the cap open and the bike upright, being careful not to slosh fuel about too much you could test this?
Would have thought the engine would refuse to rev at all with a lack of venting.
Mine was getting bogged down mid range and the more the throttle was opened the louder the exhaust got with very little response.
Convinced it was running rich so I set the float height to 24mm ithen checked that the fuel level was about right at 7mm below the joint face.
This improved matters a bit but the air screws then had to be set to one and a quarter turns out for steady idle.. So much for measuring fuel level. Now running lean at idle?
Had to be something else that was worn or out of spec.
The only original items left were the needles and tubes so bit the bullet, replaced these and reset floats back to 21mm ... Better response and pulls in top. Idle screws are now at about two and a quarter turns out.
Seemed to be down to the air/fuel mix being off at partial throttle openings.
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