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Post by doulsy on Mar 12, 2016 15:32:11 GMT
was looking at guides on how to tune your carb and came accross this:
Once it is running (even sh*tty), slowly turn in the air mix screw until the bike stalls and dies. Turn it a half-turn at a time. Give it a minute or two between changes. Did you need to turn it all the way in and it still is running. Congratulations, you have an air leak. If you turn it in 1 full turn (after starting at 1 and 1/2 turns out) and the scooter stumbles and slowly dies, your jet is probably correct. If it starts to die after 1/2 turn in, your jet is too big. Assuming you don't have any air leaks.
yep mine is still running, any tests i could do to locate this air leak? i will order new carb gasket for starters, noticed the rubber round carb box is split and the grommit for the mixture screw whole is missing, would this make difference? i doubt it would but better to ask.
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Post by henri on Mar 12, 2016 16:44:32 GMT
theres always some clown more than happy to give bad news an spread the misery . its not a definite for air leak test .can be worn mix screw/wrong profile end on screw / or a carb body somebods over tightened mix screw before an "volcanoed" out the little hole into venturi which admits air .too big cut-out in slide will sideline the mix screw an draw fuel with screw all in . with scooter running ,can of easy start in one hand (called "start ya b*st**d" in usa ) an some washing liquid in other .avoiding hot exhaust spray easy or carb/brake cleaner at joints ,if revs rise its sucking easy . spray washing up liquid at same joints ,bubbles=blowin . wash off washing liquid as its got salt in it to soften the water ,will furr up ya cases . H
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Post by doulsy on Mar 12, 2016 17:12:22 GMT
theres always some clown more than happy to give bad news an spread the misery . its not a definite for air leak test .can be worn mix screw/wrong profile end on screw / or a carb body somebods over tightened mix screw before an "volcanoed" out the little hole into venturi which admits air .too big cut-out in slide will sideline the mix screw an draw fuel with screw all in . with scooter running ,can of easy start in one hand (called "start ya b*st**d" in usa ) an some washing liquid in other .avoiding hot exhaust spray easy or carb/brake cleaner at joints ,if revs rise its sucking easy . spray washing up liquid at same joints ,bubbles=blowin . wash off washing liquid as its got salt in it to soften the water ,will furr up ya cases . H cut out in slide? i noticed my slide the plastic bit at the bottom dont fully close
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Post by doulsy on Mar 13, 2016 13:33:08 GMT
theres always some clown more than happy to give bad news an spread the misery . its not a definite for air leak test .can be worn mix screw/wrong profile end on screw / or a carb body somebods over tightened mix screw before an "volcanoed" out the little hole into venturi which admits air .too big cut-out in slide will sideline the mix screw an draw fuel with screw all in . with scooter running ,can of easy start in one hand (called "start ya b*st**d" in usa ) an some washing liquid in other .avoiding hot exhaust spray easy or carb/brake cleaner at joints ,if revs rise its sucking easy . spray washing up liquid at same joints ,bubbles=blowin . wash off washing liquid as its got salt in it to soften the water ,will furr up ya cases . H cut out in slide? i noticed my slide the plastic bit at the bottom dont fully close i mean the gap looks kinda big as you say H, too big a cut out on the slide can i still ride it like this while breaking the engine in or does it need fixed asap, another thing i noticed, when you give the carb bolts a good tighten the slider is a bit stiff, ie, when you open throttle right up it can stick at times, loosen a bit and throttle is fine.
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Post by henri on Mar 13, 2016 14:25:55 GMT
if ya slides stickin when carbs torqued down it probably means its got a warped body from overtightening in past . that will give you a air leak between carb n carb-box probably . take it off an hold a straight edge/metal rule upto it an look for gaps/uneveness . if it is distorted you can lapp it on fine abrasive paper layed over a sheet of glass til its flat again . H
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Post by pxguru on Mar 14, 2016 3:50:18 GMT
Also check there isn't some non-original screw holding on the carb box.
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Post by doulsy on Mar 14, 2016 20:06:20 GMT
Also check there isn't some non-original screw holding on the carb box. The screw looks original, im gonna order a new carb, will let ye all know how i get on.
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Post by doulsy on Mar 18, 2016 22:26:47 GMT
put a spaco carb in with a gasket i made from gasket paper and looks like air leak is gone, put my original jets in the spaco carb and it would not idle and was a total bassa to start, must of kicked it 50 times, put the spaco ones back in apart from main 22 jet and its ticking over ok, need to wait till tomorrow or sunday to mess about, also started replacing bits on my original delorto carb and i think thats gonna be ok in the end with a few more parts, maybe need idle screw and i will get it checked to make sure its not bent, changed the slider spring and noticed the slider closed like the spaco one, before that it stayed open a fair bit like in the pictures i posted.
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