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View Full Version : trx 400ex with 416 kit


radrob
02-12-2008, 06:00 PM
I HAVE A 02 400EX WITH A 416 KIT. MY QUESTION IS, IS AT A COLD START ITS POPS FROM IN BETWEEN THE HEAD AND THE JUG, BUT DOES NOT DO IT ONCE ITS WARMED UP. WHAT COULD THAT BE? WITH A 416 KIT DOES ANYONE KNO WHAT THE BORE IS ON THAT? THANKS, WILL
hornetgod13
02-12-2008, 06:06 PM
I have a 416cc 11:1 piston and I have never heard a popping noise that you mentioned. Are you sure you did'nt blow a head gasket? The bore is 87mm.
AutoRoc
02-12-2008, 06:14 PM
Head gasket is all that could be. You could try adding a little more torque to the headstuds. It's warming up and sealing better I'm guessing.
radrob
02-12-2008, 06:34 PM
DO THEY MAKE A TOP GASKET SET FOR A 416 CAUSE I CANNOT SEEM TO FIND ONE. I WAS TOLD THAT I HAVE THE USE A 440 GASKET KIT, OR USE STOCK KIT AND TRIM IT.
hornetgod13
02-12-2008, 06:40 PM
I used a stock XR400 head gasket on mine. It was 87.5mm in diameter and didn't require any trimming.
radrob
02-12-2008, 06:47 PM
I AM KINDA NEW TO ALL THIS. I WAS INTO QUADS ALOT WHEN I WAS A KID SO I HAVE NO IDEA WHAT A XR400 IS. AND DOES THE WHOLE TOP END GASKET SET FIT THE 400EX OR IS IT JUST THE HEAD GASKET THAT FITS? SHOULD I PUT HEAVY DUTY HEAD STUDS IN? IT HAS 11:1 COMPRESSION RATIO
casey_lamm
02-12-2008, 06:55 PM
honda dirtbike.

Originally posted by radrob
I AM KINDA NEW TO ALL THIS. I WAS INTO QUADS ALOT WHEN I WAS A KID SO I HAVE NO IDEA WHAT A XR400 IS. AND DOES THE WHOLE TOP END GASKET SET FIT THE 400EX OR IS IT JUST THE HEAD GASKET THAT FITS? SHOULD I PUT HEAVY DUTY HEAD STUDS IN? IT HAS 11:1 COMPRESSION RATIO
hornetgod13
02-12-2008, 07:19 PM
You'll get mixed opinions on the heavy duty studs on a 416cc 11:1 set up. I stuck with the stock studs. If I ever go any higher, I will install heavy duty studs.
I ordered the 2004 XR400 head gasket separately from www.bikebandit.com and purchased a top end gasket kit for a 400EX right off Ebay.
radrob
02-12-2008, 07:32 PM
BUT WHA KINDA BIKE IS A XR 400?

AND DID YOU USE THE XR 400 GASKET FOR THE BASE GASKET? (JUG TO BLOCK)
hornetgod13
02-12-2008, 07:41 PM
Honda 2004 XR400R head gasket. The base gasket is a stock 400EX.
j450rking
02-12-2008, 11:11 PM
a xr400 is a dirtbike and honda used the xr400 engine in the 400ex minus the kick stater. so you can use a gasket kit for the xr400
damon#6
02-23-2008, 08:45 AM
what are all u people saying ...k yo just order a full gaskit kit for a 2002 400ex it willl fit everything i just went through that u dont need a bigger one fot the head its the samesize thats what i did just go a 2001 400ex gaskit kit and gaveit to the shop and they used it all..i have that samethings in my bike
TRXRacer1
02-23-2008, 08:38 PM
Originally posted by damon#6
what are all u people saying ...k yo just order a full gaskit kit for a 2002 400ex it willl fit everything i just went through that u dont need a bigger one fot the head its the samesize thats what i did just go a 2001 400ex gaskit kit and gaveit to the shop and they used it all..i have that samethings in my bike Are you messin' with us or do really think you don't need a bigger head gasket for overbores?:huh
damon#6
02-24-2008, 09:21 AM
welll i dunoo i just ordered a 2001 gasket kit and gave it to the shop and they used it maybe they trimmed it but they used it i know that ....
TRXRacer1
02-24-2008, 02:10 PM
Originally posted by damon#6
welll i dunoo i just ordered a 2001 gasket kit and gave it to the shop and they used it maybe they trimmed it but they used it i know that .... That's possible, sometimes you can trim them. Sometimes they're just bigger to begin with. I just bought a Cometic gasket set for an old LT230 and they make the standard head gasket 1mm bigger for this machine. The point to take from this is that you need to make sure it's right and in most bigger bored 400ex's you don't get this lucky and do need to order a larger size. Each machine and circumstance can be different.