Engine Question - jetting help

[lawdog800]

I am building a 2000 400EX that is 0.040 overbore,so a 406. I have done a search and cant find what I am looking for for jetting help for the combo I have.

Again it is a 406 now with a wiseco 11.1 comp piston, Stage 2 Hotcam and a full Pro Circuit T4 exhaust system, Stock gearing. I am from Michigan, so basically 700-1500ft elevation range.

I am looking for what people have used that works, to at least get a starting point..I cant afford to break it.......I usually jet to the safe side.

I saw hornetgod13's jet specs, but i dont know if being a 416 instead of a 406, a stage 1 instead of stage 2, and just a slip on compared to full exhaust if it will make a difference..
Oh, and I plan on the open top airbox lid with the outerwears cover over the hole...Intake snorkel removed
Thanks

[Honda#4]

I'd say start with a 160 or 165 main and work down

[hornetgod13]

For your set up I would suggest 40K Pilot, Clip on 4th Slot Down, and a 158K Main. That might be a little on the rich side but, you said you wanted to be safe. You can work down from there. Being Lean is more destructive on an engine than being on the Rich side.

[Def-e-nition]

I too am sitting in the same predicament .
My problem is that the dyno jet list says to use a 170 main with the lid off .
I have found this to be a little too rich , compared to what others along the coast in the Us are using .
Yet , with full system , and Lid off , they suggest a 170 below 1500ft .


Now if you guys are suggesting 165 main on a 406 - why the hell would dynojet then suggest such a large jet size ?
I also run a stage 1 , and for the life of me I cant seemn to get myself to commit to the 170 .

[REPOMAN]

Originally posted by hornetgod13
For your set up I would suggest 42K Pilot, Clip on 4th Slot Down, and a 162K Main. That might be a little on the rich side but, you said you wanted to be safe. You can work down from there. Being Lean is more destructive on an engine than being on the Rich side.
i was going to say the same thing but i was thinking a 155 main