anyone not runnin an airbox at dunes??
what are some good ways to keep filter clean ???
maybe i should put it baack on????
its a k&n filter
any know where to get good after market engine upgrades for an 250r atc??

i used to run a nylon stocking over mine filter with no airbox, or you can buy a pre-filter. as for parts check out duncan racing, dennis kirk, rocky mountain atv. its a very popular bike with many parts available. you could upgrade with a boyesen rad valve, pipe and silencer, port and polish.

maybe rro3 will chime in with some help, he still has his.

Same engine as the 86 TRX

http://www.ctracing.com/trx250r.htm

http://www.duncanracing.com/atvproducts/

You didn't say what year the wheeler was.

I assume you have the bike jetted for the clamp on.

If the bike is a 85-86 I would recomend keeping the air box.

The air dam smooths out the air entering the carb. You could still run a K&N ..
Some people don't trust the K&N in the sand, I run them but only because I make sure they are well charged (oiled ) and always run a outerwear prefilter on them.

I'm sure Aftermarket has forgotten more than I know about R motors....
but hey She can't live on the board like the rest of us

I run the esr air box eliminator with an outerwear.


when things come to externals like pipes and intakes, it becomes bike specific and not so much engine. you have to cut off one of the air box prongs to install the airbox eliminator kits.

keep it oiled and DONT clean it too often.

Have you thought about running it with the box on, but keeping the lid off? That is how I run all my bikes. You get more air, but at the same time you help your filter fight against to much sand.

I don't run a airbox. It makes getting into the carb allot EZer and removing the filter for cleaning a breeze. Just make sure you use a outerwear over your filter..

I got my filter mount from James Lucky, they have allot of stuff for the R's ...

I also run the ESR kit. I did not have to cut any tabs. I did use a couple large hose clamps to secure it to the frame. Without them it was a tad 'floppy'

Works great unless you hit water. That's a big NO-NO!

that's why it's called the TRX Air Box Eliminator. It doesnt fit on the trike frames due to the stock air box prong in the way.

If you run no air box, you should probably get the eliminator kit. Too much up and down movement (whoop sections) can cause the air filter to pull right out of the intake tube to the carb. On most bikes the carbs 'float' between the air box and the cylinder. If you get rid of the airbox, the carb, and filter are both hanging from the cylinder, which can cause the thing to pull right off the bike. ALWAYS run a pre-filter/filter sock/precharger, air box or not, that way if you have more that one of them, you can swap them out mid-weekend for a quickie filter clean.

The kit I used uses those stock airbox prongs and also holds the brake res...

the ATC prong is different than the TRX. That's why the kits are usually for TRX only.

I run a air box with no lid with a K&N and outerwear, bought it like this. I would run an air box if I were you, but you can get by without it if you are only riding sand. Just be sure you maintain your filter.

Also, be sure to re-jet it if you took off the box. Otherwise it will be way lean with that much more air and

my neighbor ran his once without airbox, he had to jet up around 200 for the main jet. He accually felt a loss in power compared to running it with an airbox w/o lid. Now he has an airbox back on w/o lid running a 170 main. 1986 atc250r.

What main you runnin James?

so i could just use a stocking and be okay??
i havn't been runnin a precharger ever since the k&n one it came with got dirty and that was a while ago. Should the engine be okay?how bout the filter??i cleaned it on a reg. basis but i seen above that i shouldn't do that.should i buy a new filter??not long ago i was on a night ride when i hit a puddle i didn't fly through i kinda skidded to it then when i got to the edge of hit i downshifted and hit the gas to pull the front wheel up and stopped in it u think water might have got sucked into the filter. i shut if off immediatly
whats a good jet to run at glamis with no airbox,fmf reeds and exhaust and 88 headgasket(thinner)

I don't know what jet you should run. Maybe someone here has the same set-up and can give you a ball park figure. That being said, all bikes are diffferent. You are going to have to richen it up quite a bit since the motor will be getting a lot more air. i would start off way fat and go down from there.

that means go up in size????go with the higher #s im runnin a pretty high number jet as it is.i think that means its richer??what way richins and leans out on the air/fuel mix screw

Some more info...

http://www.glamisdunes.com/invision/index....hl=250r+problem

ALSO SINCE IM RUNNIN A THINNER HEAD GASKET COULD I USE 91 OCTAEN OR SHOULD GO 105???I HEARD I WAS SUPPOSE TO RUN 105 TO 110 AND THATS WHAT IVE BEEN DOIN
IVE BEEN RUNNIN 6OZ TO 1GL INMY GAS

I have a CR gasket, used to run 50/50 91 and race gas but, out of laziness I don't use the race gas anymore. Honestly, I haven't noticed any difference.

I heard "use it" and "don't use it".

do u mean 50/50 as in a 5gl jug with 2.5gls of gas and 2.5glns of oil

Here's a good link to learn how to jet your bike.
It also covers fuel.

http://www.eric-gorr.com/twostktech/carbtuning.html

i'd try a 160. stock is like 145 or some garbage.

i run a 170 at glamis.

run a stocking or outerwear and clean the outerwear on a regular basis and inspect the K&N often but dont clean it as often as the outerwear. all the older guys say the more you mess with the K&N's the less they work. the more you clean it the more you break down the gauze and having a little bit of sand on the filter helps the filtering process.

always check your intake track for dirt.

blubbering means as in not raping out in the high gears??

this is what i mean.

Wow Tres, that thing looks great. Good job

Go to bed moofer!!

The last pic was today....

2 1/2 months to get there...

Started 1st kick


Sorry for the hijacking

WOW Tres!! The atc is lookin great! Have a for all the work. Doesn't look like a shark bit your fender anymore.

Hey 24v good to see yer back on the board

You rollin with two yfz's this year?

or still punishing the wife with the blaster?

Damn Tres that looks better then new. Nice work brother...

I wanted a setup like HA2 has but could never find a intake tube to clear the rear shock.. I used the stock tube and just used the ring out of the airbox..

Tres- Bike looks great

that's the ESR kit.

www.esr250.com

sorry, i do not know the diameter of the tube from the carb/filter.

K@N's are good for clean/dustless riding spots....

better get a UNI!

last time i rode it was at my property in ocotillo (rocks). the filter and intake track are clean as a whistle and i will clean the outerwear, but im kind of busy installing a new swing arm, pro x cylinder and LRD pipe.

airbox is the way to go.just drill holes in the lid or remove it.As for k&ns they suck.good for hiway use only everyone i have had i had probs with dirt and sand getting thru yes it was oiled and prefiltered absolute junk IMO.My brother ditched his airbox on his banshee and that thing gets alot of sand thru his filter too.Hr id going back to an airbox also.