I was wondering if anyone has a440 or 426 kit with a cam. Does it make a big diffrence and is it still reliable

 

I have a 440 kit. I run 13.5 to 1 compession. I blow head gaskets every two months. I have a webcam, larger valves and porting. My bike runs great. I don't think it's that reliable. If I wanted something reliable, I would go with a 88.5 mm piston. I would run a wiseco 10.8 to 1 piston and a 450/451 web cam ( with this cam you don't have to harden your rocker arms). That would be reliable and cheap. ($400.00)

 

I had a 416 kit installed on my EX a few months ago. The difference in power is amazing. When I was looking to increase my bore size, here is what I was told from various forums. I am not a mechanic, or an engine wiz, so take it for what it's worth:


With the 426, it is the last bore on the stock jug, and leaves the walls too thin for extended reliability, and tends to heat up really quick.

With the 440, the compression is hard on gaskets, and tends to blow them.

The 440 is also very hard on the stock rod.

The 416 has a lighter piston, and revs the fastest.

If, for some reason, you end up scoring the cylinder on the 416, you can still step up to a 426 bore, if needed.


The cost of my 416 was as follows:


JE 10-8.1 piston and gaskets----$140

Hotcam Stage II cam--------------$120

Bore cylinder------------------------$60

Heavy duty cam chain-------------$80

Heavy duty clutch springs--------$60

Heavy duty valve springs--------$90

Port and polish---------------------$250


The last four items weren't required, but I was told it would increase the longevity of the new, more powerful motor, so I figured why not.


I hope this helps.

 

Thank you guys for the info that helps.

 

Great info Quadfather! I hear the 416 is a pretty awesome kit.