Losing power at full throttle after upgrading to a bigger jet in carb

[Snap]

Hi guys.. love the karting hobbie but still learning about motors. Hoping someone could help me with this.

I upgraded the jet on my carb to a 130 size and now at full throttle I lose power just for a second and then it comes right back. It does that repeatedly while at full throttle. Motor is a gy6 with no other upgrades.
Thanks!

 

[MTScott]

Sounds like maybe you're too rich... I'd drop a size in the jet and see how it goes.

 

[Snap]

Ok I'll try that thanks

 

[madprofessor]

Sounds like the intermittent cutout of a low oil level sensor. Know why hotrodded small engines always have the low oil sensor removed? It's because hard acceleration or hard angle tilting makes it kill the spark until it senses oil again. Kinda like this....................

at full throttle I lose power just for a second and then it comes right back.

It does that repeatedly while at full throttle.

 

[Denny]

Mad, no low oil sensor on a gy6 engine.

 

[madprofessor]

no low oil sensor on a gy6 engine.

Thanks, never had a gy6, and obviously I didn't research that part. Love learning new stuff here.

 

[Denny]

A

Thanks, never had a gy6, and obviously I didn't research that part. Love learning new stuff here.

Aint that the truth. You can learn a lot here if you have a open mind.

 

[Snap]

Does anyone think it could be the cdi restricting the rev limit. Thinking about buying a dc racing cdi

 

[Denny]

I do know if your electrical system is a/c you need an a/c cdi box. If d/c then d/c box will be needed. No mixing and matching.

 

[MTScott]

How did it run before the jet change?

 

[Functional Artist]

Maybe after increasing the jet size, it's "starving for fuel" (for that split second)

Have you made any other adjustments?

 

[Snap]

Ran great before the jet change , so maybe I'll just put the original back in. But I ordered one a size smaller then the upgrade. Once I receive it I'll install and let you guys know how it works.

 

[madprofessor]

Check that spark plug first, see if it's all black and sooty, and if it wipes off with a single swipe of a clean rag. That would indicate it's running too rich, and you may indeed need a smaller jet.

 

[Snap]

Spark plug had a little black on it but not that much really. I'm pretty sure it's just too rich cause it kinda like chokes at full throttle. Got my jet a couple days ago but didn't get it installed yet. Will give update when I do.

 

[Snap]

Put next size smaller jet in last night. (Size 120) problem solved! Thanks for the help!