drillen out jets

blasterjarred

New Member
Sep 7, 2008
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missiouri (booteheel)
how hard is it to drill out a jet like the local shop is realy expensive and not open today and i wana ride how hard would it be to just drill it out wit somethen a lil bigger cus i need a 260 and i have a 230
 
there really precise, i dont think you can do it, they have to be rifle bareled or whatever you call it, to make it perfectly smooth.

maybe u can. i dont think so though.
 
I've done it before.
Just find the biggest bit that will fit in the hole and go one size up.
Then check ur jetting..
 
Naw mayn ptiing (spits in spitoon) o'er yonder 'em ole boys aint skeereda use suuum redneck engineering ptiing

No seriously on my KFX 730 after I put in the race cams they didn't make a big enough jet for that carb so we'd just drill 'em out.
Same thing as buying a bigger jet...Gotta be precise, though in this guys position he's way lean and he sure can't hurt anything by going bigger ptiing
 
No idea..maybe bring the bit to a local shop, ask to see a couple jets, and measure them against a couple bits!!
 
haha, i've often thought of this, but never gave it a go. just go in small incriments, maybe even get a bit that will fit in the hole and just reem it a little and give her a try. i can definately see a difference in the size of the whole between the stock 230 and the 350 i am runnin now, but from a 230-260? i don't know how their measured, i know a 250 doesn't have a 1/4 inch hole... so it can't be thousandths of an inch... and i don't think it's 10 thou either... sorry ramblin...

go ahead and try it, worst thing that can happen is you drill it out waaay to big and foul a plug or 2, then have to buy the jet u need anyhow. just go in small increments to keep the overbore to a minimum.
 
haha, i've often thought of this, but never gave it a go. just go in small incriments, maybe even get a bit that will fit in the hole and just reem it a little and give her a try. i can definately see a difference in the size of the whole between the stock 230 and the 350 i am runnin now, but from a 230-260? i don't know how their measured, i know a 250 doesn't have a 1/4 inch hole... so it can't be thousandths of an inch... and i don't think it's 10 thou either... sorry ramblin...

go ahead and try it, worst thing that can happen is you drill it out waaay to big and foul a plug or 2, then have to buy the jet u need anyhow. just go in small increments to keep the overbore to a minimum.

Yeah if you do try to ream it out, make sure you keep the bit parallel to the hole; you don't want to wobble out the hole you might have problems
 
a lot of hill billys do this. HA ha well I just got an exhaust and I am working at a cnc machine shop currently so I can ream it to a tolerance of +-.0001 I am confident this is precise hill billy sh*t now p'ting
 
haha, i've often thought of this, but never gave it a go. just go in small incriments, maybe even get a bit that will fit in the hole and just reem it a little and give her a try. i can definately see a difference in the size of the whole between the stock 230 and the 350 i am runnin now, but from a 230-260? i don't know how their measured, i know a 250 doesn't have a 1/4 inch hole... so it can't be thousandths of an inch... and i don't think it's 10 thou either... sorry ramblin...

go ahead and try it, worst thing that can happen is you drill it out waaay to big and foul a plug or 2, then have to buy the jet u need anyhow. just go in small increments to keep the overbore to a minimum.

the jet number is measured by the number of cc's per minute
 
I had to do this for my TTR 230 the pilot jet was lean after I got rid of the spark arestor and swiss cheesed my air box. They onlt had main jets that were bigger so i jetted the main the non hillbilly way and then I took a welding tip cleaner and went to town. There basically just an assortment of really small round files, it works great.
Mark Walke
06 TTR 230
01 Blaster
84 YZ 80
69 Honda 450
63 Honda S90
 
lol i was just doing it for fun cus i couldnt hurt anything and i have to buy a new one anyways and the local shop is asken 9 bucks for a 270 jet


$9.00 for a jet? You need to find a new shop. Mine charges $2.00 each and it doesnt matter what size. Does your shop also charge $300.00 for an FMF silencer that should cost $120.00?