Since this engine modder has "arrived on the scene" it seems we've been all too shy to ask questions , so I thought I'd start a thread.

I'll go first?

DJ - I have this problem with my Sirio XXX engine , and I thought , well we all know you can help.

I'm looking for a little more top end and some more bottom end and I wouldn't mind some more midrange response & pull so I we can run with your JB mod engines ......

What would you do with the port timing ? would you bring the boost ports in earlier or later ?

Exhaust port and crank timing? do you advance or retard the crank window?

Do you think the fat boy Nova pipe works better at low revs than the 2611 or 2643? What do you think I should set my clutch gap to?

Finally , what squish clearance with head shims do you think would be best for 16% nitro.....oh , and what is the best oil mix.