Yamaha's amazing reliability!


21 replies to this topic
  • 450_rider

Posted November 21, 2005 - 08:33 PM

#1

Just finished checking my valves all in spec! Haven't had to adjust them since i bought the bike in 03 :applause: Never again will i ever have another bike, besides yamaha.

  • rasta

Posted November 21, 2005 - 08:43 PM

#2

i'm on my 3rd motor on my 03 thanks to a bad factory rod bearing with no help $$ from yamaha, then after a complete top and bottom rebuild 10 minutes into 1st ride motor blew up again cuz of detenation in the cylinder. once again no help from yamaha or yamaha dealer. love the bikes &%$#@! the company or corporate or whoever they are. bitches

  • Jeremiah

Posted November 21, 2005 - 08:48 PM

#3

I've heard many many many stories like 450 Rider's and less than a handful of stories similar to rasta. Rasta, I'm sorry to hear abour your experiences, but the law of averages say it won't happen again if you buy another blue. They're wonderful bikes!

  • rasta

Posted November 21, 2005 - 09:07 PM

#4

I've heard many many many stories like 450 Rider's and less than a handful of stories similar to rasta. Rasta, I'm sorry to hear abour your experiences, but the law of averages say it won't happen again if you buy another blue. They're wonderful bikes!

that is true,i just have bad luck, always been like that but anyways i am getting a 06 wr450 for the street here in ca, since i have a red sticker bike and have to travel 2 hours to ride on the dirt, i have not rode anything yet that feels and pulls like a 03 450, my 02 was close.

  • Goosedog

Posted November 22, 2005 - 04:54 AM

#5

I love my '02 YZ426, but...........the intake valves have been tight and needed shimming three times since I got the bike used last year. :applause:

  • MotoGoalie

Posted November 22, 2005 - 07:27 AM

#6

I love my '02 YZ426, but...........the intake valves have been tight and needed shimming three times since I got the bike used last year. :applause:


You might need to look at replacemen of the valves then since it seems they are stretching pretty quick.

Metal stretching. What a funny concept.

  • yz_for_me

Posted November 22, 2005 - 08:11 AM

#7

I love my '02 YZ426, but...........the intake valves have been tight and needed shimming three times since I got the bike used last year. :applause:


Unfortunately, unless you know how the bike was maintained before you owned it, all bets are off when buying used.

  • Goosedog

Posted November 22, 2005 - 08:21 AM

#8

Unfortunately, unless you know how the bike was maintained before you owned it, all bets are off when buying used.


The previous owner was a friend of mine and I know he treated the bike well and maintained it often. Unfortunately however he ran the bike with a K&N airfilter which I'm certain was the culpret in wearing the intake valves so much. This most recent valve adjustment was since I went back to a properly oiled foam filter so I'm just hoping it's the last I see of the negative effects from the K&N.

  • 99raptor

Posted November 22, 2005 - 09:28 AM

#9

Bought an 04 new and the valves have been perfect.Only things I' ve had to do is replace 2 :applause: :ride: rear tires.No defect in the tire i just use the heck out of this bike.

  • rdefonce

Posted November 22, 2005 - 12:31 PM

#10

Just finished checking my valves all in spec! Haven't had to adjust them since i bought the bike in 03 :ride: Never again will i ever have another bike, besides yamaha.


I bought my '99 YZ 400 new in 99, and checked valve clearance in 2004 for first time. :p They were all within spec :applause:

Ron D.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Ga426owner

Posted November 22, 2005 - 12:38 PM

#11

I bought my '99 YZ 400 new in 99, and checked valve clearance in 2004 for first time. :p They were all within spec :applause:

Ron D.


Now that is amazing............ :ride:

  • MotoGoalie

Posted November 22, 2005 - 01:31 PM

#12

Now that is amazing............ :applause:


Yeah it is.
sincerely,
CRF 250s

  • yz_for_me

Posted November 22, 2005 - 02:54 PM

#13

I bought my '99 YZ 400 new in 99, and checked valve clearance in 2004 for first time. :ride: They were all within spec :applause:

Ron D.


That's awsome. What's funny is you hear Honda guys bragging about how great their valves are holding up when they are still in spec 40 or 50 hours later. I'd like to see a Honda guy (not an XR) with a similar story. Oh, thats right, Honda didn't make a MX thumper in '99. :p

  • 642MX

Posted November 22, 2005 - 04:50 PM

#14

I love my '02 YZ426, but...........the intake valves have been tight and needed shimming three times since I got the bike used last year. :applause:



You need new valves, they will keep going out of spec until they break. Dirty air filters (or clean K&N's) caused the coating on the valve to wear off.

  • 450_rider

Posted November 22, 2005 - 06:27 PM

#15

You need new valves, they will keep going out of spec until they break. Dirty air filters (or clean K&N's) caused the coating on the valve to wear off.


I have been using my K&N for last year or so it hasnt harmed my valves at all, or am i just lucky?

  • Goosedog

Posted November 22, 2005 - 06:28 PM

#16

You need new valves, they will keep going out of spec until they break. Dirty air filters (or clean K&N's) caused the coating on the valve to wear off.


Actually the one intake valve that had been out of spec the most was OK this time but my mechanic said the other two were right on the border so I had him adjust them. If they're all within spec now and I'm not at the last possible shim allowed, do you think they'll be OK for a time or am I courting disaster?

  • Goosedog

Posted November 22, 2005 - 06:30 PM

#17

I have been using my K&N for last year or so it hasnt harmed my valves at all, or am i just lucky?


The pro's and con's of K&N's have been debated on other forums here at TT. The general concensus is that they do not filter the really fine silt that can get into your valves.

  • 450_rider

Posted November 22, 2005 - 06:35 PM

#18

The pro's and con's of K&N's have been debated on other forums here at TT. The general concensus is that they do not filter the really fine silt that can get into your valves.


Oh I see, where I ride its always raining, or on gravel logging roads, but I think i might just want to get a new filter, don't wont to worry about my valves.

  • PK

Posted November 22, 2005 - 07:07 PM

#19

Goose, if your valves have had to be adjusted three times in a year, you need to replace them before you drop one. If you do drop one your parts list will most likely include a cylinder, head, cam, crank, piston, rings, etc... My riding buddy had his let loose after 250 hours on the motor. These motors are tough, but it's giving you a sign you should heed.

As far as K&N filters go, the only way to flow more air than a stock filter is to filter less. It's simple physics. Is whatever minimal power you gain from a K&N filter worth it?

I'm on my 3rd YZF and the only engine work I ever did was on my 99 YZF400 when I did the piston and rings because the bike had 3 years of ALOT of riding on it and I thought I should. The piston was fine, the rings were ready though. I know there are bikes out there that will out handle my current 03' 450, but they won't outlast it or beat it up the hill. I'm amazed they get this much power out of the motor yet it's still stone cold reliable...

  • 642MX

Posted November 22, 2005 - 07:36 PM

#20

I have been using my K&N for last year or so it hasnt harmed my valves at all, or am i just lucky?



Your lucky, or the damage hasn't been found yet.





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