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Discussion Starter · #1 ·
Hi, I am looking for a Big Bore for my sons KFX 400, He has Stage 2 Hot Cams and Dyna tek with Full exhaust, I know there info out there when searching but everything I find is 10 plus years old, Is there any updates? Which kit is better and why? What jetting should I start with? Get a Jet kit ( If so which ) or buy individual jets. Thanks.
 

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As far as Jetting goes, it's cheaper to buy individual jets, but a kit like Dynajet gives you an adjustable needle as well, that works great in these quads.
 

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Discussion Starter · #4 ·
Do you guys think the Jetting will change with BBK? I have heard it does not. I ordered the Athena kit since the CW is back ordered all over.
 

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Do you guys think the Jetting will change with BBK?
You should go one or two jets sizes larger on the main, and might want to richen the the fuel screw a bit, IMO.
 
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Discussion Starter · #7 ·
Which base gasket should I use? DRZ E Gasket with this kit? It comes with Copper washers for the head bolts should I re use the factory stainless steel ones?
 

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You can use either base gasket. Thin one will give you more power/compression, but you will need to stick to high test fuel. Not sure on the copper washers, I have only re-used my stock ones on the kits I have had.
 
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