99 mxz 670ho Crankshop Jetting?

[MXZ TL]

Got a sled with crankshop pipes and is still stock jetting 310-340 Does anyone kno the Ideal jetting for these pipes on this sled....??? Just freshly rebuilt the top end because whoever worked on it before had no clue what they were doing so i'm cleaning up their mess.... thanks 1999 MXZ 670 HO

 

[BeachSled]

Hope this helps, if you can't read it let me know

 

[MXZ TL]

thanks so much I couldn't find anything anywhere

 

[H.O.Rider]

thanks so much I couldn't find anything anywhere

That appears to be STD 670 Jetting info and not 670HO. Totatlly different. Run the stock pipe if you have it. Played with twins on 670's for over 10 years.
They can be made to work great but are very sensitive to temperature and altitude. The 670HO single exhaust is as good as it gets. Maybe 5 HP difference at peak but the single stomps on it down low and runs great all the time. just my opinion though...