what size bit to use to drill the exhaust?

lacrosseboy · Post by **lacrosseboy** » Sun Jul 20, 2008 8:57 pm

i have been reading around and i know to only drill 2 holes but i am wondering if anyone has a recommended drill bit size to use? thanks in advance

gobucks · Post by **gobucks** » Sun Jul 20, 2008 9:22 pm

as big as you can fit in there.

justinnielsen01 · Post by **justinnielsen01** » Sun Jul 20, 2008 10:48 pm

no no no. you need to drill two holes 5/16 inch it creates the right amount of back pressure

Kenny_McCormic · Post by **Kenny_McCormic** » Sun Jul 20, 2008 10:59 pm

justinnielsen01 wrote:no no no. you need to drill two holes 5/16 inch it creates the right amount of back pressure

No you stick it up the tailpipe and drill 2 restrictions.

justinnielsen01 · Post by **justinnielsen01** » Sun Jul 20, 2008 11:20 pm

that what i ment but in the baffles. that guy said to drill the biggest one

lacrosseboy · Post by **lacrosseboy** » Mon Jul 21, 2008 8:09 am

justinnielsen01 wrote:that what i ment but in the baffles. that guy said to drill the biggest one

i know that you drill holes in the baffles but i also know that there are two baffles ones just a little farther back do i drill 1 hole into both or just two holes in the first baffle?

keithw · Post by **keithw** » Mon Jul 21, 2008 9:04 am

One hole through both. As with any mod, check your plug and pay attention to the mixture. Most anything will make it run leaner and risk siezing. The first thing I did when I started mods was to check what main jet was in the carb and buy the next size or two bigger. Whenever you make a mod step up the main jet till it starts to four stroke at the top end then back off one size. Jets are way cheaper than pistons and rings.

keithw

Kenny_McCormic · Post by **Kenny_McCormic** » Mon Jul 21, 2008 12:32 pm

keithw wrote:One hole through both. As with any mod, check your plug and pay attention to the mixture. Most anything will make it run leaner and risk siezing. The first thing I did when I started mods was to check what main jet was in the carb and buy the next size or two bigger. Whenever you make a mod step up the main jet till it starts to four stroke at the top end then back off one size. Jets are way cheaper than pistons and rings.

keithw

Yea properly tuned it will 4 stroke on the stand.