Re: yet another jetting question

Brent wrote:

> Your CB650 does have CV carbs, and they do have diaphragms.  You can access
> them by removing the tops of the carbs (without removing them from the bike,
> I imagine).  Once the tops are off, you'll see the diaphragms to which Mr.
> Kelly is referring. They are large, black, and attached to a metal  part
> that drops into the barrell of the carb. One easy way to check for holes (if
> they are not really obvious) is to shine a flashlight through them in a dark
> room.
> Check out this diagram: its part 7 on the diagram.
> 
> http://houseofmotorcycles.bikebandit.com/partsbandit/oem_schematic_view.asp?schem_dept_id=210650&section_dept_id=1&section_dept_name=OEM+%28Stock+Parts%29&dept_type_id=2&model_dept_year=1981&model_dept_mfr=Honda&model_dept_id=206277&model_dept_name=CB650

No, those are not diaphragms.  The '81 CB650 has the same style of carb that
my '81 CB900 had, they are Keihin CV carbs that use a metal piston to lift
the slide instead of a rubber diaphragm.  The diagram isn't especially clear
about that, unless you are familiar with that particular type of carb model.
The distinctive shape of the cylinder on top of the carb body that the 
piston slides in, differentiates them from the rubber diaphragm types.

-- 
Mark  '01 SV650S  '81 CM400T  '99 EX250-F13  DoD #959635  RFB #2