Drilling the T pipe how much does it help?

[ridingred]

Ok, so I know with the HRC kits a replacement T vent comes with it, but i was wondering what size drill bit you guys are using on these, and if there is a noticeable increase in power from such a simple mod.

 

thanks.

[woodwardspecialties]

no power increase. it just allows the crankcase pressure to vent

[bvet4dog]

I can see why honda made a new T breather to go with hrc power up kit. I didnt get one... what sizes drill bit should i use? I wouldnt know how much i need to cut out, so that's why i asked on sizes on the bit.

[alanbmx]

I think I used a 3/8 reamer on mine, I read somewhere to just make the hole the same size as the largest diameter hole on the tee, if that makes sense

[ridingred]

thanks alan. I'm gonna see if a 3/8 bit goes into the biggest hole and if so i'll just drill the rest out.