Drilling out jets

[fandel]

Now i know what all you are thinking. this guy is an idiot. well i am about this kind of stuff and im just curious if i could possibly take a small drill bit and just ream out the inside of the jets to let a "little" more fuel in. i work at a machine shop and i have an abundance of bits and have plenty of experience with my line of work. Im just wondering if it will work?

[arsenic]

Now i know what all you are thinking. this guy is an idiot. well i am about this kind of stuff and im just curious if i could possibly take a small drill bit and just ream out the inside of the jets to let a "little" more fuel in. i work at a machine shop and i have an abundance of bits and have plenty of experience with my line of work. Im just wondering if it will work?

+1
Buy bigger jets if you want bigger jets. Don't go all hack job on them.

[scottynoface]

Is this a serious question?

[MikeyZ]

Try it out....if you screw up it's only a 20 dollar fix....
But then it's only 20 to get new jets

[HemiKat]

It will be a tuning nightmare. I advise against it. jetsrus.com has all the jets you could need and they ship pretty quickly. Can they be drilled out?Yes. Is it worth the headache? Porbably not.

[Thomas Dylan]

No reason you can't, that's all they do, drill and ream. But don't assume that every jet size is standard drill size.
Look at

http://www.affordablegokarts.com/Drilling%20Main%20Jets.php

[arsenic]

You guys fail to realize that the jet sizes actually matter. They work with the needles, and pilots. You can't just drill them bigger and expect them too work. A LOT of R&D goes into this. You can't just take a random drill bit and make them better, Jesus.

[phantasm]

1/2 inch should do it. guarantee all the fuel you can handle.

[thenastiestnate]

I've seen this done on an old dirtbike, but I don't recommend it. If you do decide to do it, definitely run a reamer through the hole after drilling.

[arsenic]

You all are discussing weather it CAN be done. I ask WHY would you do it? You think you're going to improve anything? You're NOT, period.

[05RedKat600]

You all are discussing weather it CAN be done. I ask WHY would you do it? You think you're going to improve anything? You're NOT, period.

Let him drill the jets. Then when he comes back you can tell him to get a jet kit.

[thenastiestnate]

The times i've seen it done, drilling main jets was a ghetto way to get around a lean condition caused by rusty holes in the exhausts of old dirtbikes. You can keep drilling and reading the plugs by eye to get it semi close to runable. It doesn't work well, and i'm not recommending it, but it does work as a ghettoass cheap fix.

BUT it doesn't apply to this situtation. You can possibly tear your bike up. Jets are fairly cheap, and due to the info on this forum, you know exactly which one's to get, and how to tune your carbs properly. I'd do like the guys have said and buy the proper equipment.

[loudnlow7484]

Really? Main jets are like $15 for a set of 4.

I have reamed out jets before (with a welding tip cleaner, even), but only to get myself a ballpark of what main jets I needed to buy. If you insist on doing it, drill them out until it runs a bit rich, and then get that size main, and then keep moving down until it's perfect. Don't continue running on drilled out main jets. It's ghetto and it will make tuning a nightmare for the next owner if/when you sell it...........

[hardlydangerous]

yes you can drill them....
no it wont work very well.....


yes i have tried it..... and no it was not a good result. just buy bigger jets