Speedfight 100cc cuts out on full throttle?

[stevie_]

Lately my Speedfight has been cutting out on full throttle, Once it cuts out it starts back up fine. I've been having a look around google and seems like it could be a Jet problem/Mixture problem.

Does anyone have any guides on the right settings for the carb, Also anyone no what the standard jet size is? i currently have a sports exhaust on i've been told i should increase jet size by 10% is this correct?

[unitynotsocri...]

Try looking for air leaks on the carb side and exhaust for starters
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[stevie_]

[BMWilliams]

Deffo sounds like the main jet if it bogs at full throttle

If you didn't upjet when you fitted the exhaust then yes upjet 10%

If that doesn't cure it then try a new plug and maybe a high performance coil

Start small and work your way up
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A good long ride can clear your mind, restore your faith, and use up a lot of fuel.
Never ride faster than your guardian angel can fly.
Ride, eat, sleep...repeat.

[BMWilliams]

Deffo sounds like the main jet if it bogs at full throttle

If you didn't upjet when you fitted the exhaust then yes upjet 10%

If that doesn't cure it then try a new plug and maybe a high performance coil

Start small and work your way up
____________________
A good long ride can clear your mind, restore your faith, and use up a lot of fuel.
Never ride faster than your guardian angel can fly.
Ride, eat, sleep...repeat.

[unitynotsocri...]

Just swapping the exhaust alters the tuning,fitting a different filter ,especially k and n types also alters the mixture making it run lean.
Unless its a seriously tuned pipe you can usually just adjust the mixture.
____________________
nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[Iain.]

I would check the vaccum feed to the fuel tap for cracks and leaks & test the tap operation, check the fuel line for blockages.

I'd check the fuel tank breather....and if after all of this checking out diddn't do anything I'd drain the fuel suspecting water contamination (put it in a clear container and let it settle to see)