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Carb help-2 black,2 white...

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

Guest
Hello again!
In the interest of a quick diagnosis by you guys,I'll just stick to the facts concerning my problem.Here goes...
I've just had my carbs cleaned and synch-ed by the local motorcycle wrench in town.He also did a valve adjustment.So far so good.
It ran good for about the length of time it takes to get out of sight of his shop,but I was ready for a ride and continued home.
Arrived home 15 minutes later,parked,and noticed bike was very hot.It didn't get hot on the short ride the next morning.
Symptoms: Hard to start on full choke (cold mornings now),but will with little/no choke
-runs better cold than warmer (say,10-15 mins into ride)
-hesitates/lurches along under 3-3500,then takes off,steadyrunning on the hiway ' lurchy'
-mileage has plummeted
-two left cylinders black and sooty,two right ones white
I was raging inside my helmet at this mechanic,and would have taken it to him directly,but have since become busyand haven't been able to get the bike back to him just yet.I let him know of the problem,though.I realise things happen,but I don't want to be fooled by this guy.Hey, maybe it's not even related to what he did.
Any advice on this problem will help when i do go to take it back.
Thanks again guys,

Paul Mitchell
 
Was the tank cleaned at the same time did the mechanic install a filter? IF there was rust in the tank it could have pluged the jets again
 
Yes,the tank was cleaned and sealed with POR-15 prior to the bike being sent.I let the tank dry for a week,then rinsed it out with gas just to make sure (the gas came out clean).
Thanks,I should have stated that earlier!
 
did you say which 2 plugs?? could be a coil or a disturbed wire to one of them. I dsidnt reas the whole post. sorry.
Nope not coils--wrong cylinders.
 
Sounds like a classic case of a very poor carb synch.
Bet if you hooked it up you would see the vacuum levels on 1 and 2 well above 3 and 4. This rich mixture would explain not needing much or any choke in the morning. It would also explain why it runs better while still colder. Also the poor fuel mileage and the two black plugs.
Then the two lean cylinders would cause over-heating and white plugs, as you noticed.
Of course, it could be a case of butchered carb work, such as poor float adjustment or the mixture screws set way off. But I would first hook up a vacuum tool and observe the levels.
 
With the 1,2 cylinders running black and the 3,4 cylinders running white, its a carb set up and synch problem. Keith is dead on. I will go one step farther than Keith and say the person that worked on your bike didnt have a clue what he was doing. I wrenched once upon a time for a bike dealer and the new bikes that came in for service, were worked on by the certified wrenches. The older the bike, the less qualified the mechanic that was assigned to work on it. A 20 year old bike would never see a qualified mechanic. When the guys cutting the grass and trimming the walks ran out of something to do, the owner would call them in to give them some "hands on" experience. (NO, I am not exaggerating)

Earl
 
Thanks for the advice,guys.Much appreciated! Earl,i did get the sense that
the mechanic 'rushed' the job,now that you mentioned it. We'll see what happens when I go back.

Thanks again,

Paul Mitchell.
 
Why not learn to synch and do carb work yourself? :)
A simple but good tool such as a Motion Pro vacuum tool is only $40 and we can help you if you have just basic mechanical ability.
 
I donno where you are looking but the cheapes one that i saw on the motion pro web site was $160.00.

If you know of a good deal please enlighten us as to where, and what model.
 
Carbs 2 black 2 white etc...

Carbs 2 black 2 white etc...

Not to sound rhetorical, but 2 carbs are running rich, way rich, so mileage went down. When he cleaned carbs, could have disturbed crud in carbs which are preventing float needles from shutting off properly, OR he could have bumped the floats, changing the float height, OR are the carb boots on properly OR on and on....

Running hot sounds like excess gas getting into the cylinders. Ask him what he did when he cleaned the carbs....and listen to his answer carefully. Make sure when he did the valve adjustments that they were correct. Quick check of cold clearances OR do a compression and see if it is OK in all cylinders when the bike is fully warmed up. Another way to check is to listen to see if the bike cranks evenly when hot and run switch is OFF.
 
Carb trouble - Keith is Right - Hail to Keith!!!!

Carb trouble - Keith is Right - Hail to Keith!!!!

As the subject states - we are not worthy. Hail to Keith. Ouch.
 
Re: Carbs 2 black 2 white etc...

Re: Carbs 2 black 2 white etc...

Excess gas in the cylinders would be a rich mixture. Rich mixtures run cooler.

Earl


Tony Dieter said:
Running hot sounds like excess gas getting into the cylinders. Ask him what he did when he cleaned the carbs....
Click to expand...
 
Astra625 said:
I donno where you are looking but the cheapes one that i saw on the motion pro web site was $160.00.

If you know of a good deal please enlighten us as to where, and what model.
Click to expand...
I just walked into my nearest accessory/parts shop and bought one after seeing a good review from a bike magazine.
$35 four years ago. Many at this site have bought the same tool. $40 now.
 
Still more questions

Still more questions

As a blundering idiot when it comes to carbs (rebuild and tuning) but am more than willing to jump in and learn as I go, what are the advantages/disadvantages of the mercury gauge at $40.00 and the dial gauge at $55.00 as found at Cycle-Re-Cycle?
 
Re: Still more questions

Re: Still more questions

The mercury guage does not require calibration, and is much easier to read accurately. But they do have a small mercury supply that could be dangerous if within reach of small children or pets. The dial guages do not use mercury and are more compact.

My preference is the mercury guage because it is foolproof, needs no calibration and is easier to read.

I think the best guage set is a Morgan Carbtune, but it is about 4x the cost and only available from Sean Morgan in England.

Earl


UTgws said:
As a blundering idiot when it comes to carbs (rebuild and tuning) but am more than willing to jump in and learn as I go, what are the advantages/disadvantages of the mercury gauge at $40.00 and the dial gauge at $55.00 as found at Cycle-Re-Cycle?
Click to expand...
 
Re: Still more questions

Re: Still more questions

earlfor said:
My preference is the mercury guage because it is foolproof, needs no calibration and is easier to read.
Click to expand...

Now foolproof is someting I need!

Thanks

82 GS 1100 GL
 
Re: Still more questions

Re: Still more questions

:-) :-) Just a note. When it comes, the small white restrictors you get with it are to be inserted into the ends of the tubes that will be connected to the guage.

Earl


UTgws said:
earlfor said:
My preference is the mercury guage because it is foolproof, needs no calibration and is easier to read.
Click to expand...

Now foolproof is someting I need!

Thanks

82 GS 1100 GL
Click to expand...
 
If you are looking for a Morgan Carbtune II, try EBAY, that is where i got mine. :twisted:
 
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