View Full Version : Is 440 Kit worth it?
Dizing400ex
11-15-2005, 12:52 PM
Hey guys,
Ive heard of the 440 bore kit for the 400ex and im wondering if its worth it. A friend of mine told me that the 440 kit is making like 38hp just boring the stock engine with stock components for like $300...
true???
Hows the reliability with the 440 kit?
also, I planned on going with a rev box, timing advance, HRC cam, port polish, K&N filter w outerwear and dynojets, curtis sparks X-6 full exhaust...
Is this setup better than going with the 440 kit? more or less reliable??
thanks,
Dustin
Joe400ex
11-15-2005, 01:20 PM
i personly wouldnt go with a 440. I would go with a 416 or 426 way more reliable. Plus a 416 feels like a 440 and is more realiable.440 runs to hot and has its ups and downs
underpowered
11-15-2005, 03:44 PM
if you run a 440 on all stock components you will not get 38 horsepower. You need all the other stuff you listed (cam, pipe, CDI, K&N, ect..) to really make a 440 work well. Like Joe400ex said, a 426 or 416 will be more reliable and run just as well if not better than a 440. A 416 will not have the torque of a 440, but will run cooler and rev much quicker. I have a 426 and it is in my opinion the best of both worlds. it revs quickly but is also very torquey. I would say start off with the pipe, cam, CDI, jets, and K&N then bore it when it needs it, not now.
dirtmomma
11-15-2005, 03:52 PM
We bought a 440 for our 400 also but instead decided to go w/ a 426 :) we've had it in for about7 months now w/ no problems, we just didn't have the $$ to go w/ all the other extra goodies to make it a GOOD/TRUE 440, my oldest son just started racing it in our winter FT series & he's there w/ the 450's :D:D once he gets used to it I think he will do real well on it!!
I'd go w/ a 426 you can always go bigger but it costs more to go smaller :eek: LOL
440racer66
11-15-2005, 04:03 PM
heck yeah its a good upgrade ive had no problems or over heating and i ride hard i would not run it stock thought
Bigun55
11-15-2005, 07:21 PM
My winter project is gonan b the 440 kit, Go 4 it, my buddys run it on theres and it dont run them hot and them boys ride em hard.
slamdak8782
11-15-2005, 08:47 PM
easy upgrade with good reliability. 426 revs better 440 is a torque monster 426 is actually faster. Go figure
wheeltrax
11-15-2005, 10:51 PM
i love my setup, works well.. torque monster too. it pulls in every gear.
QuadJunkies
11-16-2005, 12:20 AM
I have had no problems what so ever with my 440 ... :)
Was it worth it???????? YES!!! :blah: Ive had the 426 also, I keep it for a back up kit ...both are GREAT kits, but I think my 440 gives me more top end and less on overheating
well u arnt going to have 38 hp if u have the stock muffler and header. stock 400ex's come with 25-28 hp. a 440 kit isnt going to git u that 38 hp. u would have in the mid 30's but u could take 2 stock 400ex's and put the same it in em and one might have more power than the other one.
440s are susposed to blow head gaskets.
QuadJunkies
11-16-2005, 09:53 AM
Originally posted by blue450yo
440s are susposed to blow head gaskets.
not if you do the research and get the right kit? ;)
tooanxiousii
11-16-2005, 10:35 AM
Do guys know anybody that ports heads good ?
QuadJunkies
11-16-2005, 10:38 AM
Originally posted by tooanxiousii
Do guys know anybody that ports heads good ?
I had mine done locally so I wont be of much help on that.
dirtmomma
11-16-2005, 04:36 PM
Originally posted by QuadJunkies
I had mine done locally so I wont be of much help on that.
Ditto :) our machine guy did my 300 & my brother did our blaster!! If I were you I'd look for a reputable machine shop & talk w/ them :)
slamdak8782
11-16-2005, 05:31 PM
one thing that helps to keep them from blowing head gaskets is to have your machinist leave the sleeve out a couple thousndths to hold the head gasket inplace
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