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View Full Version : 300ex motorwork help!!!


rollie
10-22-2005, 07:34 PM
hey, im getting a .80 piston and im wondering what compression ratip i should run? id like to stay on pump gas if possible and still get power

Also..i wand it to pull in every gear...i dont know what Lift cam i should get? any suggestions??
thanks ALOT
hondardr4life
10-23-2005, 06:51 PM
Get an 11.1 compression piston, try to find a JE if possible, im not sure if they make .80 over's, but I know they make 330 pistons, and they run great. The for a cam, get a web cam stage 2. The only downfall is that you will have to get hardened rocker arms, and HD valve springs.
Tri-valleyracin
10-30-2005, 03:38 PM
nick are u racing aircooled next year? i am but my 300 is goin to have a little more mods.
rollie
10-30-2005, 05:12 PM
Originally posted by Tri-valleyracin
nick are u racing aircooled next year? i am but my 300 is goin to have a little more mods.

yeah
rollie
10-30-2005, 06:48 PM
Originally posted by Moto49X
Wiesco 11:1 ......I use to race youth production and built multiple 300ex/250x race motors. 13:1 puts way too much stress on a stock 300ex crank and the starter will have a hard time turning it over.

Thanks Roostin......moto49X? what is this dirk? lol
Cody_300ex
10-31-2005, 02:34 PM
Originally posted by Moto49X
Wiesco 11:1 ......I use to race youth production and built multiple 300ex/250x race motors. 13:1 puts way too much stress on a stock 300ex crank and the starter will have a hard time turning it over.

Don't Listen to thios fool, he dosnt know a damn thing about 300ex/250xs. :chinese: lol Get a stage 3 web cam with the hardened rockers and H/d valve springs. I would go with a .080 12:1 piston cause you will have a ton more bottom end with the extra comp. I know when a bumped my compresion up to around 12:1 it helped ALOT.
rollie
10-31-2005, 07:14 PM
Originally posted by Moto49X

now, if you arent outpulling other 300ex's and blasters in the Youth Production class...it isnt the motors fault so you have no excuses..:devil:

dude thats not fair...overweight kids should be able to run 400ex's LOL
Cody_300ex
10-31-2005, 07:48 PM
Originally posted by Moto49X
Alright, trying to show me up Cody..haha..

Here we go rollie, if you want the ultimate 300ex motor:

12:1 Weisco .80 over piston
P&P intake only
Mill/shave the head
Sparks or TC "MX" Grind cam
Sparks or TC Larger intake valves, titanium retainers
hardend rocker arms
Unlimited CDI Box
Uni FIlter
Barnett Clutch
TC Exhaust
cant forget the Lectron carb = amazing
you can also shave the flywheel but your taking a chance of breaking the key.
You could also get a heavy duty rod since you have a built motor..

now, if you arent outpulling other 300ex's and blasters in the Youth Production class...it isnt the motors fault so you have no excuses..:devil:

Haha I love you dirk. :D Dirk I say just send it to sparks, don't you? :p
Tri-valleyracin
11-01-2005, 04:18 AM
finaly u see it my way lol yes we sould be able to race 400ex's lol.but no motor mods
hondardr4life
11-01-2005, 03:18 PM
Hey Moto49X, I remember your old 300's. What do you think of the Barnett clutch. I need a new one really bad and I was wondering if Barnett is actually any good.