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Post by krajes on Sept 9, 2006 19:27:09 GMT
after I remove brass screw from my carb on full throtte my sukida sk50qt lose power  . after puting scraw back everything back to normal. why? |
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Post by cb50j on Sept 9, 2006 20:37:37 GMT
you'll probably have to adjust the fuel/air mixture screw
did you change the circlip while you had the carb top off?
............. C
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Post by krajes on Sept 9, 2006 21:13:37 GMT
where is fuel/air mixture screw and circlip?
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Post by cb50j on Sept 10, 2006 8:58:58 GMT
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Post by krajes on Sept 10, 2006 9:30:41 GMT
my circlip is on the bottom nach but still cant finde fuel/air mixture scrawe
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Post by cb50j on Sept 10, 2006 10:31:41 GMT
 it's not the arrowed one, it's the one above,partially hidden by the open ended rubber hose ............. C |
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Post by krajes on Sept 10, 2006 17:51:37 GMT
how to adjust that screw?
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Post by civvy on Sept 11, 2006 18:08:27 GMT
Hello, i've got the same ped! u have to change the main jet from a 72 to something like a 95 i've got a 98 in mine but i'm running a custom air filter.
Be aware that while your running as lean as you are now you can melt your piston crown! get it sorted!
It makes a huge difference changing the jet and removing that screw!
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Post by krajes on Sept 11, 2006 19:48:44 GMT
I just adjust fule/air screw and its runing beter.
where can I get that main jet and is it hart to fit?
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Post by cb50j on Sept 11, 2006 20:06:23 GMT
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Post by civvy on Sept 12, 2006 7:13:02 GMT
I'm confused, isnt the mixture screw only an idle mixture screw?
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Post by nitro on Sept 13, 2006 11:41:47 GMT
Good point on the mixture screw hope someone knows - The mixture screw on my sk50qt was 1 3/4 turns out when I got it. Now its up jetted to 90. turned the screw out to 2 1/2 turns seems to be fine woken the ped up ! - but a little nervous at melting the piston crown. By the way - A local precision engineering company sold me a set of drills from 0.30mm to 1.30mm. POP to drill the jet. I'm told that if you want to down size your jet fill the whole with solder and re drill but I haven't tried that. The drill set cost a fiver, I'm just wondering how big can you go on the jet  |
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Post by zippy3196 on Sept 23, 2006 15:57:55 GMT
Hi everyone,
I recently bought my son an SK50QT and found that the restrictor was a bolt that was attached to the underside of the carb top. It was easily removed using a 6mm spanner and the speed was upped from 25mph to about 37mph. I have not made any mods to the mixture or the jet size but I think that there is a slip ring on the variator. This will be removed soon when I get my hands on an impact wrench.
Can anyone confirm that this will be safe in terms of causing damage.
Cheers, Mel.
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Post by Macrofeet on Sept 23, 2006 16:11:56 GMT
The mixture screw and idle screw are 2 diffrent screws
mixture screw controls the fuel air mixture going into the engine
looser is more air in mix, tighter is less air in mix
to much air = engine runs to lean, can backfire spark plug can over heat(it will turn a redish colour or even melt )
to little air = mixture to rich plug will go black with carbon as its not getting hot enough to burn excess carbon off, engine will be hard to start due to no/little contact made on metal spark plug
the correct screw setting is between 2 and 3 turns you will need to tweak to get this perfect for your scooter
"turns" = screw driver complete turns out from when screw is tight in
The other screw (the idle screw) is basicly how much throttle the engine gets when at rest so that the scooter does not stall
the best way to set this is with engine on and scoot on stand
tighten screw to just before the back wheel starts to move
hope this helps
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. after puting scraw back everything back to normal. why?
