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SOHC.co.uk Forums => The Black Bomber Board => Topic started by: r1_pete on February 09, 2020, 06:24:12 PM

Title: 71 CB450K4 float levels
Post by: r1_pete on February 09, 2020, 06:24:12 PM
I have my 450 running, which is surprising as it was seized when I got it, but not very well.
New plugs, points, condensers, nice bright blue spark at the right time.
Carbs are spotless, all primaries etc cleaned out, and rebuild kits inc floats.
The bike is difficult to start, will run nicely at highish revs, but as it settles to tickover it dies, seems to need air which leaves me thinking its float heights.....

Can someone confirm is it 20mm to the gasket face or to the body flange?? I have them set to gasket face, which seemed the most common advice, but looking at the card tools they must set it to body flange, which is a 2mm difference.....
Title: Re: 71 CB450K4 float levels
Post by: MrDavo on February 25, 2020, 07:24:49 PM
I used the card tool, and set the level using the card tool against the carb body. I took the carbs off and held them vertically, a pain but otherwise it just wasn’t working for me when I tried to do it with the carbs in situ.

There seemed to be a fine line between too much fuel and not enough when I was trying to do it by trial and error, using the tool properly made a huge difference as it cured similar problems to yours. Tickover is now reliable, previously it had been all over the place.
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