SOHC.co.uk Forums > CB350/400

Progress - She runs at last! (75 CB400F)

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Laverda Dave:
Thanks Chris.
I've given up for the day now, lesson learnt, try the carbs off the bike in future!
I'll try again on Saturday, work gets in the way for the rest of the week  :(.

ManicGTI:
The float heights I did to 21mm, is that not right for the 400?   Bowls are are all filling fine, none of them are overflowing.

Sounds like I do the syncing in a slightly more closed position, but I don't see how that would help the richness?  I like the idea of adjusting to almost closed then using the main screw, I was just trying to stay as close as possible to the manual method.

ManicGTI:
Oops, should have checked the subsequent posts.  Yup, 21mm.

I'm wondering if starting it in the garage doesn't help, always going to sound more 'dramatic'.

My plugs were like this:
https://goo.gl/photos/dF5kWjGSGkeJ6j3e6

Is there anything else I should be checking on top of the following?
- Bench Syncing (possibly have them too far open)
- Float levels
- Idle Jets?
- Idle screw adjustment?

I'm sticking with the idle at the mo, not touching the throttle really!

Dave

Bryanj:
With a bench sync it is easy to get the slides so they dont close

first back off the idle screw till it falls out, then un adjust the carb slide adjusters so all slides hit the bottom pick one(on the 550 k3 its easy as one has no adjuster) and adjust the slide adjuster till it nearly moves, refit the idle screw and adjust it till the one you picked lets your prefered drill bit fit, 3mm is too big you need 1.5 if poss, then adjust all the others to the same. Finally undo the idle screw again and make sure all slides hit the bottom.

Run engine till hot ad ajust with gaudes AFTER you haveset tappets, cam chain and ignition timing

ManicGTI:
Thanks for the run down Bryan, I'll redo the Bench Sync as suggested.

Cam Chain I haven't touched yet.

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