Honda PC-800 Ghost: carb balance set up
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- čas přidán 9. 09. 2024
- Pacific Ghost Day 24
With all the tubes to the carburetor identified ( previous video)
And a new Honda Air Filter installed
I set up the Vacuum Gauges so I can read the balance between carburetors.
This is the first step in Diagnosing the Ghost's poor throttle response with smallthrottle openings ( flat spot)
This video compresses the adjustment process which took me 1.5 hours
( my first time with this bike, and this method), into about 5 minutes.
Note.. of a half dozen screwdrivers I tried ( including from the honda tool kit)
only my 16 inch long X-lite slot head screw driver could reach the adjustment screw ( which is a JIS cross head or phillips with a slot eg hybrid).
When I adjusted for good balance at 2000 rpm...I got a very bad result,
with very poor response when opening the throttle.
I re-did the adjustment for balance at 4000 rpm, which is the result shown at the end of the video, with good smooth throttle repsonse from idle.
This was done with no load, of course. After the front wheel goes back on,
I can check it on the road.
You can notice some roughness in the 3000-4000 rpm range.
I will change the spark plugs for new ones, properly gapped, and double check the pilot jet settings.
It is quite possible there is some clogging in a low speed jet, but before I remove the carburetors... I want to be sure all other possible causes have been eliminated.
I would like to run some Berryman's carb cleaner through the carbs also.
The carbs were removed, cleaned, and new floats and needles installed 4 years ago, but the bike has only been ridden 700 miles in that time. So fuel algae or gum are possible. The bike starts instantly, idles well, and makes good power right up to red line. So a minor clogging in 1 low speed jet is all it would take.
Thank you for taking time videoing this process, I wished you hadn’t. Your camera is all over the place. Frustrating!!
not as much as I wish you hadn't watched it. At the time I didn't have an editing program... so I had to post the raw video. A tripod certainly would have helped. If I pull my carbs to clean them, I will shoot the whole process using a tripod, and edit the video including balancing the carbs. I hope you won't watch that too. Because you might see a bug or a shadow..and I would hate for you to be frightened.
@@captlarry-3525
I did thank you and I was appreciative of your efforts. I am very sorry if you can’t take constructive criticism. You mist be a gen z or alpha.
Hi Larry, you said you were running dampers on your vacuum gauges. Where did you find those available for purchase? Name/SKU? Thanks in advance!
THE DAMPERS ARE JUST LITTLE VALVES.. LOOK LIKE SOMETHING FROM DRIP IRRIGATION !
Hi Larry, does the adjusting screw only change the idle stop position of one of the the carbs? Or does it change the cable length/slide position of one carb to balance the slides?
WHICH SCREW ARE YOU TALKING ABOUT PHIL ? THE CARB BALANCE SCREW ACCESSED THROUGH THE HOLE IN THE AIR CLEANER BOX.. IS ADJUSTING THE THORTTLE STOP ON THE RIGHT CARB ONLY... THE GAUGES TELL YOU WHEN THE TWO ARE SET THE SAME. SO YES.. YOU ARE ONLY ADJUSTING ONE.
@@captlarry-3525 Yes, I meant the balance screw way down under the hole in the air cleaner box. I used it to adjust the balance at 3500 to 4000 RPM and when the vacuums are balanced there the vacuum is unequal by 30 to 40 mm/Hg at idle of 1200 RPM. I left it that way since it spends most of the time in the 2500 to 4500 RPM range. I have noticed that the idle is lower than 1200 until it is thoroughly warmed up and returns to 1200 RPM.
DEPENDS ON WHICH ADJUSTING SCREW YOU ARE TALKING ABOUT ! THE ONE ON A CABLE IN THE POD WITH THE TRUNK PULL, ACTS ON THE COMMON SHAFT, AND IT CHANGES THE IDLING SPEED FOR BOTH CARBS... NOW THE SCREW YOU NEED THE LONG SCREWDRIVER FOR.. ADJUSTS THE SPEED FOR JUST ONE CARBURETOR.. .. HENCE IT'S ABILITY TO BALANCE OUT ANY DIFFERENCE BETWEEN THE TWO.
@@captlarry-3525 I did mean the balance screw that you reach with a long screw driver. I was curious about using that screw to set the vacuum balance between the carbs at higher RPMs but then having the vacuum become unbalanced at idle speed. I figured it was better to be balanced at normal operating RPM, but wondered if the change in balance at lower RPM is common or specific to my PC800.
@@philwarner6604 the idle mixture adjustment is limited by a stop...which is commonly removed when carbs are out for service. I think the idle mixture ( and of course the "health" of the idle jets and the mid range jets) have effects on the low speed balance - so unless you are taking out your carbs for overhaul, when you can remove those limit plugs and get full ( and proper) adjustment...some low speed imbalance is probably inevitable. Where large amounts of fuel are being metered from 3000 rpm up... I think balance is really crucial... now I had other problems... caused by some obstruction of my midrange jet, the bogus K&N filter, and at that time unknown condition of my plugs.... over time.. I sprays a LOT of carb cleaner through every orofice of both carbs, and used heavy amounts through the fuel circuit...replaced the air filter with a real one so the airflow is as designed, and installed new properly gapped plugs. This all yielded considerable improvement in engine smoothness, and throttle response. All the vacuum tubes are nice and tight, as are the connections between the airbox and the carbs. The airbox is crucial...engine will hardly run with it's cover off ! I can get an extremely slow and low idle speed when warm, with good smooth power from 2000 rpm so I think my approach has been the right one. I chickened out on actually removing the carbs and replacing /cleaning jets untill I have got 500 miles of real riding on the bike, with a fuel additive...
It's like night and day comparing how it was to now !