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Registered User
I have an 03 400ex with a 416 weisco piston, hot rod crank. I am wanting more power. I was thinking port and polish the head, bigger valves, cam, lightening the flywheel. But I don't know what cam to get. I do all woods riding and hill climbing. I was thinking stage 2 hot cam or an HRC cam. My 450r has an hrc2 cam and I like it. Just wanted to get yalls opinion.
BBBRRRAAAPPP
Cam and porting. Then swap to an 04-05 450r carb or fcr carb and of course open airbox. Did you up the compression to 11:1?
If it's stupid, and it works, it isn't stupid. - Murphy's Law
2000 426EX,sold
2004 450R WIP
-Longtime A.A.D.S. (Accessory Acquisition Disorder Syndrome) sufferer.
400EX Frequently Asked Questions, CHECK HERE FIRST!
Registered User
Stage 2 cam, port job, high compression piston…lighter flywheel won't be good for woods IMHO, bigger carb with more airflow.
1984 Honda 200M ATC
1985 Honda 200X ATC
1986 Honda 200X ATC
1999 Honda 406EX....11:1, Web Cam / Hardened rockers. Ported. WB CDI. CT Racing header. WB E-Series slip on. Lonestar swinger.
2001 Honda/KTM 520 Hybrid Quad. Its like a 400EX but twice the horsepower.
2014 Artic Cat Wildcat Trail XT
Registered User
Its a 11:1 and i will start with the head and then try to find a 450r carb
Registered User
The stage 2 Hotcam works very well on moderate 400EX builds like you are describing. If you go to bigger valves the piston may need machined for clearance. I haven't wanted to bother with that so I have stuck with stock valves on my motor. I agree with not lightening the flywheel for woods riding and hill climbing.
Current quads:
- Honda TRX 400EX - fully built 416cc motor and full XC racing setup for fast trail riding and hill climbing
- Kawasaki Prairie 650 - work quad for around our property and main quad for the wife to ride
- Suzuki LT80 - kids quad
- Honda TRX 350RX - my old school hybrid MX quad from the 90's that has a 250R chassis with a built 350X motor and has now been converted into a XC setup
Previously owned several other sport quads and a few trikes over the years.
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