how do u modify ur stock air box by cutting a hole in it? what are the bad effects if any, and where and how big do u cut the hole. anything else?

 

First of all don't cut drill carefully. I always use pencil size holes more than a few sometimes. But be careful. Drilling too many will cause your Quad to run like crap.By drilling,if you drill too many you can always tape over extra holes but cutting is forever.

 

lol. dude, drilling too many holes wont make ur quad run like crap. a lot of people cut holes out of their airbox (you can cover it with tape, it just takes a little more) or don't use the airbox lid at all. putting holes in the airbox or not using the lid makes it so that u can get more air. if u need more air, then u need to re-jet. jus cuz u cut holes doesn't mean u get more air flow, unless u re-jet

 

Seems to me that some may need to read what they write. I've been building atv's since the 4-wheel conversion for the atc250r three wheeler. Larger jets = More fuel. Holes in air box = more air volume. R&D teams scientifically match jets to air box size. With wear or the addition of an aftermarket pipe these holes would be necessary to relieve "bog" in the bottom end.Besides, jetting is trial and error and not many of your average riders have a large selection of jets in their tool boxes.So, this is a very efficient inexpensive remedy to that problem.Thank you for your input.

 

GrimRipper, you don't know what the hell your talking about. If you drill a bunch of holes or do what I did
and cut the whole top of the air box lid off and cover it with mesh, you have to re-jet it because it will be running to lean. With my airbox mod & jetting I have alot more bottom end power.

 

My appologies. I build atv's on a daily basis.Do you? Or do you just like to spout off about things?My customers are more than happy with my fine tuning of their equiptment.So, I will keep on not knowing it seems to be paying the bills quite well.Now, Sit in your "time-out" chair and read what was written.If you go arbitrarily cutting or drilling you will have to rejet.But,If you run a little leaner you can maximize performance.The engine temps will go up a little"anyone with knowledge of the internal combustion engine knows that".So, complain as you will as I will keep "fine tuning" machines.Your "opinion"matters to me......not.I guarantee my work as customer satisfaction is Most important. So in essence,unless you are Head of Research and Design at a Major Manufacturer and your opinion is accredited I will listen.But until then enjoy,keep riding, and please keep the combativness to a minimum.All you cause is bad feelings and cause people to forget about sportsmanship and objectiveness.Thank you for your input also![img]i/expressions/face-icon-small-smile.gif[/img]

 

will drilling holes in the box have any effect on the air filter?

 

Ok,what I am about to tell you is only for getting initial "bog" out of your machine.It is an inexpensive fix to this plus it's a way to get the most out of your current jet.I drill the holes in a triangular pattern the base of the triangle being the top-rear of the airbox. This way you get better flow with out damaging the air filter. And also, that seems to be the spot with the least amount of dust.Use a bit the size of a normal pencil. Now, start off with 5 holes in a 3-2-1 pattern. Make each hole about an eigth inch from any other with the first hole being at the bottom right side of the top of the box.From here, add or tape off holes in the same manner until you have your desired throttle response.If done properly you can,using the same jet,go from idle to full throttle with little if any hesitation.The first machine I used this on was an atc 185s Honda that with a stock carb,cylinder,and cobra quiet series exhaust would "stand up" in 3 out of 5 gears with a 13 tooth front sprocket and a stock rear.So, remember to take your time do it right and you should be very happy with the results

 

Not to start anything but what I believe what Grim is saying is common racing knowledge. He is saying that by drilling tiny holes in your airbox you can effictively lean out the mixture and gain HP. YOur motor is on the edge but it has not crossed over. Now if you rip off your airbox lid, then you cross over and it runs like crap unless you rejet. But by drilling the small holes like he is suggesting, you are maximizing the HP of your combo w/o having to rejet...free HP. A lean bike (within reason) is a faster bike, a rich bike is a slower but safer bike. Hope this makes sense.

 

Thank you,most people don't take the time to brush up on little things like this since it is so easy and uncomplicated to rejet.I am a very picky person and I feel if it doesn't run right it's because I didn't build it.I don't charge my customers by the hour but by the job!That way all is understood and I can take the time necessary to give the best possible result.