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View Full Version : 440 for stock 400ex plus cash


TheBlasterMan
08-18-2005, 12:09 PM
I am getting a 400ex but it has a 440 kit on it. It has stage 3 cam, heavy duty studs, new clutch, bottem end just rebuilt, high compression piston 12.5:1 and some other things that i cant remember. I am looking to trade for a 400ex motor that is stock plus some cash. This motor is off a 1999 ex
Chino886
08-18-2005, 12:42 PM
Originally posted by TheBlasterMan
I am getting a 400ex but it has a 440 kit on it. It has stage 3 cam, heavy duty studs, new clutch, bottem end just rebuilt, high compression piston 12.5:1 and some other things that i cant remember. I am looking to trade for a 400ex motor that is stock plus some cash. This motor is off a 1999 ex

How much cash, see my sig, it is stock bore.
TheBlasterMan
08-18-2005, 02:04 PM
Im not sure how much should i ask for?
Chino886
08-18-2005, 02:14 PM
I don't know, bigger=unreliable, smaller=less power! Big toss up!
murrays400ex
08-18-2005, 03:43 PM
just for ur info 12.5 to 1 is not high compresion like 13or 13.5 and uop is race gas and u have 2 run race gas
TheBlasterMan
08-18-2005, 06:27 PM
with 12.5 what do i have to run? Octain?
Derag2
08-18-2005, 06:42 PM
91 minumum, 93 would be better but not all places sell 93.....
TheBlasterMan
08-18-2005, 06:52 PM
so im not going to screw up the moto if i run 93?
khen
08-18-2005, 06:57 PM
At 12.5:1 on the 400EX you are going to need to run at least a 50/50 race gas and premium mix. With my 11:1 I have to run 50/50 or it pings like mad.
400exrider707
08-18-2005, 09:27 PM
Yeah 12.5:1 is race gas territory. Im not a big fan of mixing gas:o

Also I wouldn't even bother with that thing unless it has a heavy duty rod running the 12.5:1 piston. What other motor work exactly does it have???
TheBlasterMan
08-18-2005, 10:56 PM
it has a heaavy duty rod
engine was made to race, only raced gncc once, it was just rebuilt.
Chino886
08-19-2005, 08:46 AM
Originally posted by TheBlasterMan
so im not going to screw up the moto if i run 93?

If it were my motor, I would only run race gas in it, being that a 400 is air cooled, you don't want to risk detonation. I have read that anything over 11:1, you should run race gas.
99_300ex
08-19-2005, 10:59 AM
ya i heard the same as chino.
TCracin440ex
08-20-2005, 01:42 AM
Originally posted by murrays400ex
just for ur info 12.5 to 1 is not high compresion like 13or 13.5 and uop is race gas and u have 2 run race gas

bull chit....with a 12.5:1 you have to run race gas...its considered high compression....with a 11:1 ratio you wont have to run race gas...