Oversized valves or not??????

[dunerider09]

I'm rebuildn my motor. On my 05 trx. Cp 94mm 13.0:1. Falicon stoke srtoke, porting by KPS. HRC cam, Alba race exhaust. I'm gonna use Knibblewhite valves an springs. DO I WANT OVERSIZED VALVES????? If so, y? Thanks for any help. I appretiate it.

[mud99]

It will help on the performance.

[tomgodd]

Bigger valves means more flow of gas and air.

[dunerider09]

Thanks. Wat r da cons, other than highr fuel consumption. That's not a big concern at this time. Wood they require additional head work and flow with da HRC cam?

[mud99]

Any time you add bigger valves there will need to be head work done at a machine shop. You dont want to go to big because of the chance of cracking the head if it gets too hot. You may need to get a different st of rockers as well.

[dunerider09]

It makes sense. I was thinkn that I mite hav to do da rockers as well. Man, it never ends. Thanks for da info.

[mud99]

LOL Ya I know what you mean. I start off doing small mods and ut never ends from there.

[dunerider09]

I'm not sure bout da stock carb either. Evryone is tell me go wit da 41mm FCR.

[mud99]

I would decide on the carb stuff after you get what you want done to the engine and you will know more about what size you will need to go with.

[dunerider09]

Ill wait till mon to talk to KPS bout da head work he's doin to c if I can go with da ovrsizd valves. I wood rather pay $4.00 for a jet than $700.00 for an FCR. Lol