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Running too rich, adjust needles or jets

  • Thread starter Thread starter 78swazuki
  • Start date Start date
7

78swazuki

Guest
I have a 78 gs 750 a me and a buddy chopped up and made into a bobber. I had problems with the floats sticking and dumping gas all over the engine. I cleaned out the bowls and put in a new inline fuel filter now no more leaks. Now the problem is once I go to give it full throttle it loads up and has no power, ind of makes that gargle sound. Should I change the jets or can I adjust the needle? Im running pod filters and open exhaust. Need the quickest fix possible I have a ride to go on in 2 weeks
 
As Cowboyup says, you need to run the engine at specific throttle openings, then "chop" the ignition (use the 'kill' switch), pull the clutch and coast to a stop in a safe place. Read the plugs to see what they are telling you. The pilot circuit can be checked at 1/4 throttle, the needles are checked at 1/2 throttle, the mains are checked at wide-open. This process is known as "plug chops".

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Seana23 said:
Prob, main jets then eh?
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Click to expand...

Possibly but no telling Seana; I'm no expert but reading and listening to the guys that do know makes me think something else is not correct. One thing I didn't see as well was how well he "cleaned out the bowls" since the bowls are a very tiny part of the entire carb system. Spraying cleaner at them doesn't account for much cleaning power as we both know the inside passages can be real clogged and he'll never know it. Also, what sizes are his jets and what other true maintenance has been done?

Depending on what kind of filter you put in, it stopped the leaks because nothing is getting through which I'm thinking relates to your gurgling sound. Did you set your floats to the proper level as stated in the service manual?

And please for all that's holy put some good pipes on your bike instead of making a nuisance throughout the neighborhood.:pray:
 
I cleaned out the bowls because there was a bunch of sand in them when I took them off I plan on going through the carbs because my friend did all the engine work and now no longer lives here. I have to figure out what I need for jets and everything, as far as my pipes go I like em that way, Stock sucks thats why I cut my bike in half and made it cool lol Thanks for the info tho
 
Start from the tank..make sure any loose material is flushed out of there and check the screen on the petcock for crap stuck to it. Then remove the inline filter.. then dissassemble the carbs and be sure the "sand" didnt get sucked up and clogged the pilot jets, the needle jets, or clog a passage in the bodies. Then set the pilot screw ( on the bottom ) at 7/8 turn out from lightly seated and the mixture screw ( on the side ) at 2 turns out. This is the "baseline settings" and youll probably see very decent performance there as a start point. I am assuming you have the stock VM26s???
 
Regardless of our differing tastes in what constitutes a "cool" bike, you need to start with CLEAN carbs set to proper specifications before you start making adjustments.

I just might help to tear them down completely, clean all the jets AND the passages in the carb bodies by soaking them in Berryman's Carb Cleaner Dip for a day (each), then re-assembling with a new set of o-rings from cycleorings.com. It is well worth the time and effort, and you will KNOW that things have been set correctly, then you can make informed adjustments from there.

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You can put 2 carb bodies side by side in the can if you remove the basket..use some pliers or whatever to set them in and take them out. READ THE FRONT OF THE CAN WHERE IT TALKS ABOUT TOXIC AND CAN BE ABSORBED THRU THE SKIN....WEAR RUBBER KITCHEN GLOVES FOR HANDLING THIS STUFF!!!!!!! And by "a day" he means a full 24 hours for the soak cycle on all parts and bodies.
 
Oh and back to the original post.. isnt any fastest or easiest fix my man..do it right or keep struggling.
 
If you've bobbed it I would be a bit wary of using full throttle. Best for pottering around on the pilot circuit.
 
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