Carb Float Adjustment Clarification

e3steve · Post by **e3steve** » Fri Jun 03, 2011 5:58 am

In conclusion (hopefully) and to clarify:

Each carb is different, albeit microscopically, and comprises its own individual mixture 'character'
Manufacturing tolerances of the era differ drastically from those of today's
Engines' fuelling requirements vary, as a result of the foregoing, therefore:
Honda's measurements incorporate a (+/-) tolerance scope

So, there you have it: follow the manual'(s') indications, along with your own motors' behavioural and informational feedback; monitor the plugs' colours and the bike's performance.

Start from the beginning. Follow Honda's / Ed's fundamentals: ignition timing and basic carb setup, both of which are found on this forum. Keyword search and/or FAQs, then 'tune' your own engine to your own individual riding environment and habits. The hint is in the word 'tune'; you wouldn't buy a musical instrument and, irrespective of your skill level, embark upon a public concert without playing the instrument and tuning it beforehand. Air/fuel (14:1, or 14 parts air to 1 part fuel) mix varies with air density (oxygen content) -- air density & pressure vary with altitude, temperature and humidity. I live and ride at, circa, sea level (as does Jensen) where the air pressure is +/- 1 atmosphere (14.7psi). That's a goodly difference from those of you riding the higher altitudes.

CL77NOW · Post by **CL77NOW** » Fri Jun 03, 2011 7:43 am

yes, YMMV ,THANKS:
each bike, engine, rider, climate, altitude and carb, is different.
(EFI is born,LOL)

i think the key for any turner is a good base line.
not starting with an engine that fouls the plugs, in 1 min
no running so lean ,it's burns valves.
I would bet having a good float level , at the beginning, puts you in the ball park, at 0 feet SEA.

The pw26 carb , the "just see jet" dont work on mine, not by a mile. (2 stock carbs)
I also think mixing up the 72 and 77 data is too easy. many posts do that. at least 4 permutations.
single and dual cab, and 250 and 305cc (not to mention generational, if any)

I'm glad i waited to tune (and pre setup) my carbs till last.

I've had to tune my bikes (i loan them out) an othesr running the Rubicon 2- 3 times each summer. on the fly.
(pocket full of jets) so no stranger to altitude at all. grin

http://cl77.servebeer.com/

100% concluded.....

e3steve · Post by **e3steve** » Fri Jun 03, 2011 8:09 am

CL77NOW wrote:bless you for that so clear photo STEVE, and works out same is my photo's (tried all 3 ways)
that gauge is it 22.5mm? CL77 26MM throats.?

e3steve wrote:When all's said & done, the 'right' method results in the correct relationship between the surface-height of the fuel in the bowl, the jet holder/emulsion tube and the carb's choke/throat/venturi (whatever you wish to call it). yes,, I do believe it all must be correct !!! ever inch.

Ed knows more about these Hondas than most of us here, put together; his "line of sight" method, as delineated in posts 4 & 8 here, works for him and others.

I use my Honda metal float height gauge; I have PW26 carbs. She runs sweet.
i can't imagine working backwards
put in correct jets for sealevel (then plug in 5 gas analyzer or the analog equiv, LOL)

then working backwards to correct float level. that must be a long row to hoe.
lucky its 22.5mm and only 3 ways to do it.
dang luckly Steve you are the hall of fame.. i owe you a 6pack!!

all comments , stock jets, etc.

Sorry, forgot to answer that Q; yes, 22.5mm.

Hey, what's YMMV? You Made Me Vomit?☺☺☺☺

brewsky · Post by **brewsky** » Fri Jun 03, 2011 7:32 pm

e3steve wrote:When all's said & done, the 'right' method results in the correct relationship between the surface-height of the fuel in the bowl, the jet holder/emulsion tube and the carb's choke/throat/venturi (whatever you wish to call it).

Ed knows more about these Hondas than most of us here, put together; his "line of sight" method, as delineated in posts 4 & 8 here, works for him and others.

I use my Honda metal float height gauge; I have PW26 carbs. She runs sweet.

Steve,
Questions, questions.....

Are your jet holder and main jet seated in these pics, or are they loose for picture purposes?

I notice what appears to be a ring around you main jet, which usually indicates "late (current) thread" pitch jets?

CL77NOW · Post by **CL77NOW** » Fri Jun 03, 2011 7:59 pm

steve.
that is very funny !
you made me vomit
it is gov tripe
your mileage may vary.
(or your carb, car, altitude, or what ever, makes my comment not valid)

im rebuilding a VW bug and everything is a bloody variable.

e3steve · Post by **e3steve** » Sat Jun 04, 2011 2:49 am

brewsky wrote:
e3steve wrote:When all's said & done, the 'right' method results in the correct relationship between the surface-height of the fuel in the bowl, the jet holder/emulsion tube and the carb's choke/throat/venturi (whatever you wish to call it).

Ed knows more about these Hondas than most of us here, put together; his "line of sight" method, as delineated in posts 4 & 8 here, works for him and others.

I use my Honda metal float height gauge; I have PW26 carbs. She runs sweet.
Steve,
Questions, questions.....

Are your jet holder and main jet seated in these pics, or are they loose for picture purposes?

I notice what appears to be a ring around you main jet, which usually indicates "late (current) thread" pitch jets?

Hey Brew, carb(s) are as removed, for powertrain rebuild. All I did was unclip the float bowl, so nothing has been loosened. The bike runs so well that, apart from a bit of a WD40 cleanup, I shan't be making any changes.

The set is a pair of 3K-milers, for which I paid US$300 in '08, from a '67 CL77 and re-needled to suit my CB. I've been told, by a higher authority, that -- contrary to 'words in print' -- all carbs' jet threads are JIS; I have yet to discover different, but perhaps I'll pull some jets and observe the pitch. I'll let you know....

LOUD MOUSE · Post by **LOUD MOUSE** » Sat Jun 04, 2011 3:01 am

HONDA did change the threads on later jets which can be found to have a ring around them.
I have a couple here. .............lm

e3steve wrote:
brewsky wrote:
e3steve wrote:When all's said & done, the 'right' method results in the correct relationship between the surface-height of the fuel in the bowl, the jet holder/emulsion tube and the carb's choke/throat/venturi (whatever you wish to call it).

Ed knows more about these Hondas than most of us here, put together; his "line of sight" method, as delineated in posts 4 & 8 here, works for him and others.

I use my Honda metal float height gauge; I have PW26 carbs. She runs sweet.
Steve,
Questions, questions.....

Are your jet holder and main jet seated in these pics, or are they loose for picture purposes?

I notice what appears to be a ring around you main jet, which usually indicates "late (current) thread" pitch jets?
Hey Brew, carb(s) are as removed, for powertrain rebuild. All I did was unclip the float bowl, so nothing has been loosened. The bike runs so well that, apart from a bit of a WD40 cleanup, I shan't be making any changes.

The set is a pair of 3K-milers, for which I paid US$300 in '08, from a '67 CL77 and re-needled to suit my CB. I've been told, by a higher authority, that -- contrary to 'words in print' -- all carbs' jet threads are JIS; I have yet to discover different, but perhaps I'll pull some jets and observe the pitch. I'll let you know....