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ridein'red7
08-03-2010, 07:51 PM
well i am not a racer but i ride my buddies track here and there and lots of trails and sandpits and just free ride in feilds. i am planning on doing a 416 10:1 wiseco with a hotcam stage 1 with mild ported head. i have a full yosh system and thats pretty much all for engine mods but further down the road i want to do a 450r carb i heard about a yfz 39 mil? or anyones imput to a different one i also have a amuminum airbox and uni clamp on style filter. i have um propegs and new holeshots all the way around 20s in the back 21s up front now what gearing should i run?
ANY ADVICE WILL BE GRATEFUL thanks,Nick have a few pics but the engine is in a crate in my run waitinig for gaskets to be put together and the greatest thing i got it all for 500bucks and it olny neeeded minor honing and piston

CJM
08-03-2010, 08:01 PM
I say you do 4:16 and 11:1 and if you want really lowend power stg 1 cam or midrange to higher rpm go stg 2 cam.

I have 416, stg 2 cam, 11:1 w/slip on and its FAST.

ridein'red7
08-03-2010, 08:07 PM
would the headstuds take it? and what gearing are u runing and how do u like it?

honda400ex2003
08-03-2010, 08:10 PM
sounds like a good setup to me :D you will like that setup it has put smiles on my face for over 2 yrs. the studs will most likely be alright and i like my 15/38 for general trail riding but some like the 14/38 also. steve

ridein'red7
08-03-2010, 08:12 PM
im staoked i might have to upload pixs lol

slightlybent47
08-03-2010, 08:28 PM
This will help you on the gearing.
http://home.earthlink.net/~gellett/400ex.htm

ridein'red7
08-03-2010, 08:33 PM
thanks but i dnt really care about the speeds just how they like it haha

ridein'red7
08-03-2010, 08:51 PM
also what ratio would i be safe with 93 octane

honda400ex2003
08-03-2010, 08:55 PM
10:1 and 11:1 should be good for the most part. usually 11:1 is alright on 93 as long as it is fresh. steve

ridein'red7
08-03-2010, 09:13 PM
is there much difference between the too such as power?

honda400ex2003
08-03-2010, 09:16 PM
imo not much. my stage 1 10:1 ran ahead of a 11:1 stage 2 easy enough. it did before my 450 carb and stage 2. so they are pretty close to the same imo. steve

CJM
08-03-2010, 09:21 PM
I find the lowend is about where it was stock-maybe a bit more-but once the rpms kick up say 2nd or 3rd it wants to pull the front up if i give it to much throttle.

honda400ex2003
08-03-2010, 09:24 PM
Originally posted by CJM
I find the lowend is about where it was stock-maybe a bit more-but once the rpms kick up say 2nd or 3rd it wants to pull the front up if i give it to much throttle. agreed :D it keeps a smile going doesnt it lol steve

CJM
08-03-2010, 09:38 PM
Originally posted by honda400ex2003
agreed :D it keeps a smile going doesnt it lol steve

Yep :)

I gotta be carefull I dont hit it to much lol. Now only if my truck didnt break down I could go riding steve..dang shame..

Good luck with your build riding red, it will be fun.

ridein'red7
08-04-2010, 09:49 AM
will the stock head studs hold with a 11:1 and can i run 91-93 pumpgas

honda400ex2003
08-04-2010, 11:24 AM
it should be good to go. steve

ridein'red7
08-04-2010, 11:35 AM
sweet thank you for the help!! anything else i should do while its apart

honda400ex2003
08-04-2010, 12:27 PM
valve seals and a valve lap would be good while you have it apart. then it should be good for quite some time again. steve