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To all YFZ 450s

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1 To all YFZ 450s on Thu Apr 23, 2009 11:10 am

I would like to post all my recent troubles with my YFZ in case anyone out there has one. First, the motor seized due to lack of oil to the crank and rod while up on the back wheels for too long. I had the rod replaced and had the oil mod done. I then put the bike back together and foolishly didn't follow the re torque instruction exactly as some of the steps seemed unecessary, a buddy said he always just tightened the head bolts really tight in an X pattern. Well, i can tell you the head gasket will blow or you will pull air into your cooling system causing overheat everytime. Most mechanics will focus on the cooling system and then check the jug and head for warp and everything else while all along its just improper torqueing of the head bolts. I got the bike running great again but has about 2 weeks of head scratching first. cheers

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2 Re: To all YFZ 450s on Thu Apr 23, 2009 1:57 pm

didnt yamaha get some of those bugs worked out in the 07 and 08 models? (I hope Sad

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3 Re: To all YFZ 450s on Thu Apr 23, 2009 2:58 pm

Yes in 07 and up they did add a oil mod into the motor assy.
As far as the TQ sequence always fallow the manual.

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4 Re: To all YFZ 450s on Thu Apr 23, 2009 3:25 pm

yep, im fact, you can install the 07 and up oil system on the older models.

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5 Re: To all YFZ 450s on Thu Apr 23, 2009 8:55 pm

myheadhurts wrote:yep, im fact, you can install the 07 and up oil system on the older models.

correct you can, but if you add a Big bore to them they have cleareance issues also.

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6 Re: To all YFZ 450s on Thu Apr 23, 2009 9:11 pm

bummer, i just had the hole drilled that sprays a fine stream directly on the rod

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7 Re: To all YFZ 450s on Thu Apr 23, 2009 9:54 pm

myheadhurts wrote:bummer, i just had the hole drilled that sprays a fine stream directly on the rod

Thats all i do on my motors cheaper and just as good.

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8 Re: To all YFZ 450s on Fri Apr 24, 2009 10:54 am

it works great, i can wheelie all day long without fear of wallet leakage

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9 Re: To all YFZ 450s on Sat Mar 27, 2010 9:13 pm

i have this 2006 yfz450 i bought a new battery but when i get done rideing the battery is low i got to charge it every time any body know what may cause the problem.

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10 Re: To all YFZ 450s on Sun Mar 28, 2010 4:26 am

bryan

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Check with xtrmsuperman..........I believe he is having the same problem and has narrowed it down.

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11 Re: To all YFZ 450s on Sun Mar 28, 2010 7:39 am

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Kray I have done some digging on this exact problem for other members, it is definitely that the factory YFZ did not have enough charging power to keep the battery maintained, especially with alot of start and stop riding. I think your only alternative is to either put in a higher watt stator/cdi or to do a battery box mod and put in a bigger battery. I found this page with some great info and pics, might be a good start for you

http://atv.off-road.com/atv/article/articleDetail.jsp?id=192624


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12 Re: To all YFZ 450s on Sun Mar 28, 2010 9:10 am

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I have a few friends who ride these and one of them was told that on the ones up to 07 you have to ride with your headlights on. That is how the battery charges. I know it sounds stupid but none of them have battery issues anymore. Hope this helps.

13 Re: To all YFZ 450s on Sun Mar 28, 2010 10:58 am

Grizzly Rick

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I agree with Brandon, a buddy of mine has a 2004 YFZ, he was told also to ride with headlights on all the time. it seems to work.

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14 Re: To all YFZ 450s on Sun Mar 28, 2010 12:26 pm

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I wonder if there is some defect in the stator or CDI that tells the computer not to charge unless the system is "under load"?


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15 Re: To all YFZ 450s on Sun Mar 28, 2010 4:57 pm

I bet the charging circuit is in series with the headlight therefore if no power returns through the common no power is applied to the rectifier.

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