84 vf 1000 f carb problems? HELP !

Need HELP !! 84 vf 1000f

Hello.
Have a 84 vf1000 that hasnt been on the road for many years ,
Have opend all carbs and cleaned them !
Very rough idle, lot of smoke , plugs gets very sothy( black) only at idly
Need help!!!

please excuse my bad english.

Amator

 

Did you take them off then apart and soak them in a cleaner? Kept each carb's parts separate. If not you really did nothing to them. Just cleaning jets, float bowls may not do anything. The circuits they feed need cleaning also. Sounds like the float setting is way off, to high or needle and seat problem which will cause flooding. Could be other things though. Like what are the pilot screws set at, are the slides working smoothly, did you have slides out and get the springs mixed up. There are two different sizes(lengths). If it's that rich (sooty) you will wash the oil off the cylinder walls. After prolonged use you will ruin the cylinder finish and rings. Do have a factory manual. I'd suggest you get one for your bike or any V4 first generation and read the carb rebuilding section. Have you ever successfully rebuild/modified other carbs before? If not seek someone who has. You'll have a fighting chance then.

 

Taken them apart as the book (clymer) says. Test drove the bike. 10k rpm at 3.gear.
Stop the engine with stop button. All plugs looked like new. Maybe lean.but ok.
So problem is only when idling. Tried to adjust pilot mix screw.I can hear that something changes but not much.Even tried to ultrasoundwash them, if something was clougd in them,compessed air.everything after the book! Even tried to adjust float bowl a little higher Org: 7.5mm Mine: 8.5mm. I have overhauld other carbs before. never seen this problem.Lots of smoke and the plugs look like hell( only dry soth).
Take carbs apart 5 times.. Think I am going crazy....

 

bummer

Are you running stock air filter?Are all four plugs fouled equally?All stock jets?Bowl vents clear?Just thowing out some suggestions, difficult problem to trouble shoot over the computer. Only bring up air filter because ran into over oiled one yesterday.Curse words tend to help a little and no problem to technical that brute force and anger can't solve it.:crazy:

 

running with stock filter , all four plugs equal. Sync ok. Seems like it doesnt get enought air. Pilot screws adjusted , tried to turn them both ways . Should it get leaner when turned in or out, I read somewhere ; IN. Turned them several times but nothing much happens. I can hear the diference but it is not helping much.
Take of air filter box, seems to help a bit but it is not right to adjust the engine that way.

 

Can it be a ignition problem??

 

Have heard of several bikes where the stock jets were drilled out. The jets have the stock sizes stamped on them but you really can't tell unless you put it beside a stock jet.

Sounds like you're done everything else.

I would put the floats back to stock settings.
(when you adjust your float, see if the weight of the float depresses the pin on the needle. If it depresses the pin, I recommend replacing them...the needle is worn)

This may help your carb diagnosis:
Carburetors - SabMagFAQ

Check out the "Cleaning" and "Tuning" links

 

check the mixture screw on the sooty cylinder for a broken tip, and check that choke plunger is fully seated when OFF

 

(when you adjust your float, see if the weight of the float depresses the pin on the needle. If it depresses the pin, I recommend replacing them...the needle is worn)

how ? (no , i am not the sharpest knife in the kitchen...)

 

its all four !!

 

could be valve seals

 

Question:84 mod. Honda vf1000f with keihin carburetors: mix screw ; for leaner mix : IN OR OUT?
Most people says in but..... SOMEONE out there who knows for SURE!!

 

I know, but I HOPE its not...

Thank U all for answering me !
If I dont respond for a mail its probably because the time diference.
My clock is now 22:25 pm.

 

Look where the metal tang from the float touches the pin on the back of the float needle.
Now twist the carb until the tang touches the pin.
As you keep twisting the carb to put more pressure on the tang, observe if the pin depresses into the back of the needle.

If the pin depresses, then (technically) the spring under the pin is worn out. But since it all comes in one piece, an entire float needle is required.

They are not that expensive. Just make sure you get the correct size. Some vendors say that their float needle will fit all the carbs - not true.

 

smoke and sootyness COULD be caused by over-filled or fuel-diluted oil.

When carbs are properly done, turning in each mixture screw almost all the way should cut out that cylinder

 

oil service done before starting the bike.... bought it very cheap last fall, newer fired it up.. I painted it in org. colors this winter my self. Tried to get the org. decals to it ( white stripe/ red honda logo with red stripe against the black part on tank). But no luck ... so I painted it all !,with 4 layers of clearcoat!... the org. red color is so good looking in the sun. I used 2 weeks on the job.. And yes it was worth it !! IF I COULD GET IT TO RUN PROPERLY...