Author Topic: float level  (Read 3927 times)

0 Members and 1 Guest are viewing this topic.

Offline little honda

  • Full Member
  • *
  • Posts: 26
float level
« on: March 10, 2011, 02:22:57 pm »
I'm going through my carbs. on my 350f. i want to check the float level height. i have one of those fancy and cool Honda float level gauges. my question is where do i measure the height? all the stuff i find on the web shows the floats to be round. the floats on a 350f are flat bottomed, so as out move the gauge from one end of the carb. to the other, you will get different readings because the float is not sitting flat. any thoughts??? thank you for any and all help i might get.
                                                                                              mike

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: float level
« Reply #1 on: March 10, 2011, 02:31:57 pm »
Round side faces up as you look at the carbs oriented on the bike.
so the flat sides are in the bowl.
measure from the gasket rim, to the highest point of the flat side. which is likely to be the point furthest away from the float pin.
be sure its not depressing the float valve spring. just resting on it.
set at 22mms, but if still rich or overflowing set at 24mms
i've had the best luck with 24mm.  ;)


the goal is to get the fuel level at 4mm's below the gasket seam level.
« Last Edit: March 10, 2011, 02:43:49 pm by flybox1 »
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Bodi

  • Really Old Timer ...
  • *******
  • Posts: 5,693
Re: float level
« Reply #2 on: March 10, 2011, 04:05:08 pm »
The floats sit almost level with the setting correct in my experience.
The Honda CB350-Four shop manual shows them being measured with the gauge at the middle of the flat section.

Offline RickB

  • Hot Shot
  • ***
  • Posts: 571
    • Pop Magazine
Re: float level
« Reply #3 on: March 10, 2011, 06:17:14 pm »
little honda,

I recently rebuilt my CB400F carbs. They're very similar to the CB350F. You can see where I measured my float heights from in the photos half way down this post:

http://forums.sohc4.net/index.php?topic=51957.msg929816#msg929816

You should also have a look around the CB400F Yahoo user group for Tim Boughen's fabulous carb rebuild guide.

Rick.

Offline little honda

  • Full Member
  • *
  • Posts: 26
Re: float level
« Reply #4 on: March 12, 2011, 08:16:12 am »
thanks to all who have replied, this will give me direction on my rebuild in the basement>

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: float level
« Reply #5 on: March 12, 2011, 08:21:02 am »
be sure to pull the emulsifier tubes out from under each main jet.
clear the main passage and all the tiny holes along the sides.
let us know how its coming!
  :)
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"