carb settings

[flumpy7]

Hi again

My wifes hartford vr125z (CG125 motor) has never idled consistently, jumping all over the place. Also, it has intermittent problems with starting that i am 100% are carb related. So anyhoo, ive taken the carb off and i think that basically someone has fecked the pilot screw settings up in the past. Mr Haynes isnt very helpful on this saying, set the screw as it was when you found it. Trouble is, it was fecked when i found it. How do i reset the pilot screw to make it run evenly and sweetly? Cheers
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2012 Sinnis apache

[hmmmnz]

the haynes manual i have say 1 3/8 turns out,
the xr125 which is very similar says 1.5 - 2 turns out

i would before you do that, is set the valve clearances, (don't under-estimate how often you have to do this on a push rod motor)

then with the bike warmed up, start with 1 turn out and turn the screw
until she starts gurgling then go back half a turn back in,
that should be it sorted.
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Ichy]

Easiest way by far is to use a gas analyser or, more realistically, a colourtune.

It is possible to set using your ear.

Wind the mixture screw all the way in counting the number of turns it takes to get there. This ensures that you can at least go back to those setting if you need to. Don't force the screw when winding it in, just let it seat lightly, its way to easy to damage the tip otherwise. Set the mixture screw to whatever the base settings are, if you don't know then between 1 to 1 1/2 turns out should be fine.

Get the bike nice and warm.

Set the idle speed to a level at which the bike continues to run, probably less than 2k is best.

Keep a count on how many turns you turn the screw, to the nearest 1/4 turn is fine.

Wind the screw in until it sounds like its starting to run worse.

Now wind the screw out until the engine sounds like its running fine.

Wind the screw out 1/2 a turn extra. If it starts to sound rough again then wind it back in a 1/4 turn.

Reset the idle speed to recommended (at a guess 1k is average)

[flumpy7]

Hi guys

Thanks for the info...very helpful. I have not yet got that far however, as when i started the bike after putting the carb back on i had a constant leak of petrol from the overflow pipe and from around the pilot screw. Any ideas what i have done?
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2012 Sinnis apache

[N cee thirty]

the o ring seals not seated properly ?
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[fiery tupp]

Another way you can check the idle mix , is to , while ticking over
Spray a little wd40 at the inlet , if the idle drops it is either ok or a little rich , if it goes up it is lean
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If you can't fix it with a hammer , use your head .

[Odie]

[flumpy7]

Man this is strartin to annoy me now. I cant actually get to the mixture screw when the carb is attached cause its tucked right underneath and there is so little room to get to it. Is this the same with the cg125 does any body know?
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2012 Sinnis apache

[Rogerborg]

What's the carb? Mikuni 26mm? Looks like this?

https://2.bp.blogspot.com/__DYtEEjm5wE/SdE2lp3cYgI/AAAAAAAAABo/92yQIiecTJM/s320/carb.jpg

You can use a teeny screwdriver (like from a glasses repair set), use the slight knurling to get purchase with the end a flat bladed screwdriver and 'push' the screw round, or if you know any men, you could ask them to just turn it using their strong manly-man fingers.

Beefcake! BEEFCAKE!
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[N cee thirty]