one more performance question before i order

[andy9743]

400ex k&n pro circuit slip on rejet.....i think i'm gonna stay with the stock bore, but up the compression. to what i'm not sure...i don't want to lose ANY reliability and i want to run pump gas, any suggestions???? and add a hot cams stage two cam (hot cams will work fine w/o changing rocker arms right???) any help is appreciated

[nhs333x2]

You can run a hot cam stage two with stocksprings and without getting your rocker arms hard welded. For compression, that would be your choice.

Highest stock bore I think you can go on pump gas is a 10.5:1 JE piston. Actually that's the only stock bore High comp piston that I know of.

Colby from C&D might know of more..:confused:

[04'400ex'er]

Originally posted by andy9743
400ex k&n pro circuit slip on rejet.....i think i'm gonna stay with the stock bore, but up the compression. to what i'm not sure...i don't want to lose ANY reliability and i want to run pump gas, any suggestions???? and add a hot cams stage two cam (hot cams will work fine w/o changing rocker arms right???) any help is appreciated

I you are going to get a high comp piston, I would go ahead and do a 416 kit. Then you would need to get a heavier duty rod and have your sleeve bored but you can get that done for 40 bucks. The bike would be ALOT stronger and you wouldent lose your reliability with a 416.

[andy9743]

what about just a stage 2 and leave the stock piston in it? i know it won't be "maximizing" the cam, but i really don't want to lose any reliability at all. any idea if i just do the cam and with my other mods will i be able to at least be close to the z-400?

[foleyit]

Since you are going to have the head off to do the cam. You should consider doing port n polish. Granted it will all come together if you did a 416.

[dariusld]

Originally posted by foleyit
Since you are going to have the head off to do the cam. You should consider doing port n polish. Granted it will all come together if you did a 416. You don't have to have the head off to do the cam.:rolleyes:

[foleyit]

Stand corrected - don't need to take the head to replace the cam. But a few more bolts and you can take your head off.

[seven]

I think a 416 with a stage 2 cam would be what you are looking for. If you got to the 426 the sleeve gets real thin and has a greater chance of cracking under hard riding. The 416 will run with a 426 all day long. I have a wiseco 11 to 1 piston with the XR400 gaskets and I can run pump gas but it runs better on Higher octane fuel. Port and polish is up to you. It helps the power quit a bit but its if you have the cash. mikeboone sells full heads with valves and all with a full port and polish for around 275.00. Any way you do it these mods will wake your 400 up!

[04'400ex'er]

Originally posted by seven
I think a 416 with a stage 2 cam would be what you are looking for. If you got to the 426 the sleeve gets real thin and has a greater chance of cracking under hard riding. The 416 will run with a 426 all day long. I have a wiseco 11 to 1 piston with the XR400 gaskets and I can run pump gas but it runs better on Higher octane fuel. Port and polish is up to you. It helps the power quit a bit but its if you have the cash. mikeboone sells full heads with valves and all with a full port and polish for around 275.00. Any way you do it these mods will wake your 400 up!

Exactly what i was tryin to say.

[cheatin mother]

If your cylinder is still within spec's you can just replace your piston with a Ross 10.5 standard bore piston, stage 2 cam if you,re into high rpm riding.I would check your valve springs to see if the're within honda's height spec's. Then jet accordingly.