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Old 02-21-2013, 10:08 AM   #1 (permalink)
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400 ex piston and ring install

ok so as some of you know i havea a 2001 trx400ex with a namura 440ex big bore kit,i got my complete top and gasket kit and my piston and rings in the mail today,i have a few questions,first of,the gaps between the rings on the piston,i measured them to make sure they werent to close or the ends weren't touching eachother,but the only thing im stumped on is,witch way do the gaps between the rings need to face,ive been told since there is no pin on the piston to just make sure they all point in the oposite direction of eachother,is that true? and i put the new valve seals on it and the top end gasket kit came with o-rings??? i don't remember taking any o rings off of the quad? just the gaskets,are theses extra or did i miss something on the tear down??? im new at this and need all the help i can,this is my first time doing a top end rebuild on a 4-stroke engine
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Old 02-21-2013, 11:22 AM   #2 (permalink)
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Just make sure none of the gaps on the rings are lined up with each other. Set the first ring, turn the next one so the gap is 120 degrees off from the first one and turn the last one 120 degrees from that one.
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Old 02-21-2013, 11:27 AM   #3 (permalink)
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Well you should have a really big o ring. This one goes around the bottom of the cylinder where it goes into the bottom end of the motor. The four same sized o rings go to the valve adjustment caps on the valve cover. The rings I would put them on at a quarter turn difference for each one that away none matches up at all. small copper rings are for the rocker arms. The other off sized gaskets go to the caps for the motor if I remember correctly. Hope this helps.
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Old 02-21-2013, 11:36 AM   #4 (permalink)
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Quote:
Originally Posted by spittinyamahas View Post
ok so as some of you know i havea a 2001 trx400ex with a namura 440ex big bore kit,i got my complete top and gasket kit and my piston and rings in the mail today,i have a few questions,first of,the gaps between the rings on the piston,i measured them to make sure they werent to close or the ends weren't touching eachother,but the only thing im stumped on is,witch way do the gaps between the rings need to face,ive been told since there is no pin on the piston to just make sure they all point in the oposite direction of eachother,is that true? and i put the new valve seals on it and the top end gasket kit came with o-rings??? i don't remember taking any o rings off of the quad? just the gaskets,are theses extra or did i miss something on the tear down??? im new at this and need all the help i can,this is my first time doing a top end rebuild on a 4-stroke engine
just stagger the rings...just don't line them up with the wrist pin !...as for those left over o-rings ?..i bet they are the valve guide o-rings ?..only way to put them in..is too press the valve guides out...and istall them. this is all that i can think of as to what you have left over ?..they about the size of a dime ?..if so ?..then yeah..those are valve guide o-rings.
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Old 07-06-2014, 02:12 PM   #5 (permalink)
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What are the gaps for the top ring and second I know oil rings are .015 and I used the equation bore x .0055 is that for top ring?
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Old 07-06-2014, 03:10 PM   #6 (permalink)
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Your piston should have come with a piece of paper with the ring gaps on it.


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Old 07-06-2014, 03:13 PM   #7 (permalink)
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It didn't odd hmmm. Top ring I used bore x.0045 = .015 and 2 and was the bore x .0055 =.019
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440 - 89mm - 11:1 Wiseco
Cometic MLS set/stock studs
45 p 170 m Sigma 6 jetting
3rd clip needle/2 turns out
Stage 2 Hotcam
Powerbomb Header
FMF power core 4 /without silencer
Uni foam/ air box lid removed
Razors/ ITP Rims
Nerf bars
+3 A arms +4 Tusk axle
450R shocks
Lonestar carrier
15/38 gearing

DO YOU EVEN BRO?
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