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Dynojet A/F Meter

Fuel System: Gas (Petrol) tanks, Carburators
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brewsky
honda305.com Member
Posts: 1816
Joined: Wed Jul 23, 2008 5:21 am
Location: Princeton, WV

Post by brewsky » Wed Jul 13, 2011 10:54 am

Jensen,
Here are my measurements for both your parallel arm method and the line of sight method (at least as I understand them)

Note the measurements are taken from the carb body cutout and not the gasket surface.

Your parallel arm method, if measured from the gasket surface, gives very close to 26.5mm.

Closer measurement reveals there is a 2.2mm difference between the gasket surface and body cutout reference points.

Both are with float tang touching but not depressing the float valve.
Attachments
Line of Sight Measurement PW22.JPG
Parallel Arm MeasurementPW22.JPG
66 dream, 78 cb750k, 02fz1, 09 wing

LOUD MOUSE
honda305.com Member
Posts: 7818
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Wed Jul 13, 2011 12:22 pm

Bend the tab?. ......lm

brewsky wrote:Jensen,
Here are my measurements for both your parallel arm method and the line of sight method (at least as I understand them)

Note the measurements are taken from the carb body cutout and not the gasket surface.

Your parallel arm method, if measured from the gasket surface, gives very close to 26.5mm.

Closer measurement reveals there is a 2.2mm difference between the gasket surface and body cutout reference points.

Both are with float tang touching but not depressing the float valve.

User avatar
brewsky
honda305.com Member
Posts: 1816
Joined: Wed Jul 23, 2008 5:21 am
Location: Princeton, WV

Post by brewsky » Wed Jul 13, 2011 1:29 pm

LOUD MOUSE wrote:Bend the tab?. ......lm

brewsky wrote:Jensen,
Here are my measurements for both your parallel arm method and the line of sight method (at least as I understand them)

Note the measurements are taken from the carb body cutout and not the gasket surface.

Your parallel arm method, if measured from the gasket surface, gives very close to 26.5mm.

Closer measurement reveals there is a 2.2mm difference between the gasket surface and body cutout reference points.

Both are with float tang touching but not depressing the float valve.
LM,
I have bent the tab and tried it both ways, and it results in different float heights:

one .......26.5mm from cutout notch...(float lines up with jet holder)

and the other......26.5mm from the gasket surface.... (float below the jet holder, but float arm parallel with carb body)

There is a 2.2mm difference in the measurement starting point (cutout notch vs gasket surface) so there has to be the same difference in the float heights if you use the same spec distance for the measurement. (26.5mm for PW22 carbs)
66 dream, 78 cb750k, 02fz1, 09 wing

LOUD MOUSE
honda305.com Member
Posts: 7818
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Wed Jul 13, 2011 4:07 pm

The notch in the PW22 carb body is there as when Yasshi installed the float and used the HONDA tool all carbs were correct and would work as designed.
Ya can bend the FLOAT Things to what if any angle ya like (by now many have been changed from issue) and as long as ya have the correct MM and tang correct the dern things WILL WORK.
Too much on this subject for me.
Just use YOUR BRAIN and less ????????????????????.
PLEASE. ..............LM


brewsky wrote:
LOUD MOUSE wrote:Bend the tab?. ......lm

brewsky wrote:Jensen,
Here are my measurements for both your parallel arm method and the line of sight method (at least as I understand them)

Note the measurements are taken from the carb body cutout and not the gasket surface.

Your parallel arm method, if measured from the gasket surface, gives very close to 26.5mm.

Closer measurement reveals there is a 2.2mm difference between the gasket surface and body cutout reference points.

Both are with float tang touching but not depressing the float valve.
LM,
I have bent the tab and tried it both ways, and it results in different float heights:

one .......26.5mm from cutout notch...(float lines up with jet holder)

and the other......26.5mm from the gasket surface.... (float below the jet holder, but float arm parallel with carb body)

There is a 2.2mm difference in the measurement starting point (cutout notch vs gasket surface) so there has to be the same difference in the float heights if you use the same spec distance for the measurement. (26.5mm for PW22 carbs)

User avatar
brewsky
honda305.com Member
Posts: 1816
Joined: Wed Jul 23, 2008 5:21 am
Location: Princeton, WV

Post by brewsky » Wed Jul 13, 2011 5:37 pm

LOUD MOUSE wrote:The notch in the PW22 carb body is there as when Yasshi installed the float and used the HONDA tool all carbs were correct and would work as designed.
Ya can bend the FLOAT Things to what if any angle ya like (by now many have been changed from issue) and as long as ya have the correct MM and tang correct the dern things WILL WORK.
Too much on this subject for me.
Just use YOUR BRAIN and less ????????????????????.
PLEASE. ..............LM


brewsky wrote:
LOUD MOUSE wrote:Bend the tab?. ......lm

brewsky wrote:Jensen,
Here are my measurements for both your parallel arm method and the line of sight method (at least as I understand them)

Note the measurements are taken from the carb body cutout and not the gasket surface.

Your parallel arm method, if measured from the gasket surface, gives very close to 26.5mm.

Closer measurement reveals there is a 2.2mm difference between the gasket surface and body cutout reference points.

Both are with float tang touching but not depressing the float valve.
LM,
I have bent the tab and tried it both ways, and it results in different float heights:

one .......26.5mm from cutout notch...(float lines up with jet holder)

and the other......26.5mm from the gasket surface.... (float below the jet holder, but float arm parallel with carb body)

There is a 2.2mm difference in the measurement starting point (cutout notch vs gasket surface) so there has to be the same difference in the float heights if you use the same spec distance for the measurement. (26.5mm for PW22 carbs)
In 2009, I asked what I thought was a simple question:
http://www.honda305.com/forums/viewtopi ... ight=float
Got an answer that I thought made sense and went with it.
Hundreds of posts later, the same question was getting asked and debated over and over.
Then e3Steve posted his sticky of how to make a carb guage, and my previous belief went all to pieces.
Answers like "just use the line of sight and don't worry about it", "just get the arm level with the body and don't worry about it", and "get the correct MM and tang correct" just don't answer the question.
There is at least 2.2 mm difference in float height depending on which answer to the question is correct, and if that difference is not significant, then I'll quit worrying about it.
66 dream, 78 cb750k, 02fz1, 09 wing

teazer
honda305.com Member
Posts: 798
Joined: Mon Feb 08, 2010 10:32 pm
Location: Midwest US

Post by teazer » Wed Jul 13, 2011 6:28 pm

Brewski,
From what I have seen over the years, the floats could be out by 3-5mm and owners wouldn't notice it.

Both you and Jensen are searching for perfection and we know how obsessive and all consuming that can be.

What I'd suggest/request is that you set the floats say 3mm low (fuel level high) and test your bike's Lambda and performance.

Then raise the floats/drop fuel level 1mm at a time and repeat and tell us what the effect is on A:F and what differences you can measure.

The hypothesis is that the measured performance difference will be negligible but the A:F will show changes (not serious though) and that the rider will detect changes in rideability.

LOUD MOUSE
honda305.com Member
Posts: 7818
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Wed Jul 13, 2011 6:50 pm

OK!
Not saying ya " Need More Than a Simple Answer". HUH!
But ta me ya are "just as another" (member who has gone on to another bike) who seems to like to project ideas and show pics to do no more than continue a simple carb adjustment!!!!!!!!!
Will ya ever Get On The Bike And Ride It??????
Maybe there will be a future after all with those carbs!!!!!!!!!!!!!. ......lm

brewsky wrote:
LOUD MOUSE wrote:The notch in the PW22 carb body is there as when Yasshi installed the float and used the HONDA tool all carbs were correct and would work as designed.
Ya can bend the FLOAT Things to what if any angle ya like (by now many have been changed from issue) and as long as ya have the correct MM and tang correct the dern things WILL WORK.
Too much on this subject for me.
Just use YOUR BRAIN and less ????????????????????.
PLEASE. ..............LM


brewsky wrote:
LOUD MOUSE wrote:Bend the tab?. ......lm

brewsky wrote:Jensen,
Here are my measurements for both your parallel arm method and the line of sight method (at least as I understand them)

Note the measurements are taken from the carb body cutout and not the gasket surface.

Your parallel arm method, if measured from the gasket surface, gives very close to 26.5mm.

Closer measurement reveals there is a 2.2mm difference between the gasket surface and body cutout reference points.

Both are with float tang touching but not depressing the float valve.
LM,
I have bent the tab and tried it both ways, and it results in different float heights:

one .......26.5mm from cutout notch...(float lines up with jet holder)

and the other......26.5mm from the gasket surface.... (float below the jet holder, but float arm parallel with carb body)

There is a 2.2mm difference in the measurement starting point (cutout notch vs gasket surface) so there has to be the same difference in the float heights if you use the same spec distance for the measurement. (26.5mm for PW22 carbs)
In 2009, I asked what I thought was a simple question:
http://www.honda305.com/forums/viewtopi ... ight=float
Got an answer that I thought made sense and went with it.
Hundreds of posts later, the same question was getting asked and debated over and over.
Then e3Steve posted his sticky of how to make a carb guage, and my previous belief went all to pieces.
Answers like "just use the line of sight and don't worry about it", "just get the arm level with the body and don't worry about it", and "get the correct MM and tang correct" just don't answer the question.
There is at least 2.2 mm difference in float height depending on which answer to the question is correct, and if that difference is not significant, then I'll quit worrying about it.

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