Big Bore Jetting?

[motorowlands]

Search is down, read all 19 pgs of jetting data base, only 1 BB post, diff set up though.

06 DRZ SM, modifications:

Athena 434 BB 12.3:1 compression piston

Hot Cams, IN, EX, stage2 ? lift:9.58, Duration243

FCR 39

Needle EMM

3x4, Moose filter

Muzzy SS full sys

Trail Tech lightened flywheel

Sea level

[Wayward Son]

3x4 mod

165 main jet

emm needle

3rd clip

45 pilot jet

100 pilto air jet

2 turns fuel screw

what version of the fcr and how old?

[motorowlands]

It was from a 2000 YZF426

[Wayward Son]

ok,the above is correct.

[gosquidgo]

So when installing the big bore go with a EMM needle instead of the EMN? Also, I have a FCR39 on my stock motor (3x3 and Yosh full Ti) should I keep that carb or go with the FCR41 that I have sitting around when installing the big bore? Or option #3 wait until the headwork and cams before going to the 41?

[Wayward Son]

no,emn is preferable.he just already has the emm.

what riding type is being done?

[mickeydee]

Search is down, read all 19 pgs of jetting data base, only 1 BB post, diff set up though.

06 DRZ SM, modifications:

Athena 434 BB 12.3:1 compression piston

Hot Cams, IN, EX, stage2 ? lift:9.58, Duration243

FCR 39

Needle EMM

3x4, Moose filter

Muzzy SS full sys

Trail Tech lightened flywheel

Sea level

almost identical set up as me.

[gosquidgo]

My first setup is going to be Bigbore, Yosh Ti and FCR39, street and the occasional kart track. Setup #2 will eventually be same kind of riding but with light headwork and RHC cams. I have a FCR41 sitting on a shelf.

[Wayward Son]

fcr 41 from where?

[gosquidgo]

It's off of a KTM. It has the removable bell and I have a new Suzuki bell for it.

[Wayward Son]

i would go with the 41.