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cablemonkey334

08 yz winter time overhaul

15 posts in this topic

well now that the seasons over it time to rebuild an add some bling. just wondering what to do first. the motor has 60 hrs on it . should i just reshim ,or replace the valves . I know a new top end is in order, an dlc coating for the forks . maybe a hinson clutch .

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why do you want to to do a rebuild?? 2006 yz450f. 240 hrs , 2007 yz450f 180 hrs. 2008 yz450f 108 hrs. never rebuild or checked valves... lots of oil changes.....

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why do you want to to do a rebuild?? 2006 yz450f. 240 hrs , 2007 yz450f 180 hrs. 2008 yz450f 108 hrs. never rebuild or checked valves... lots of oil changes.....

Exactly. I cant believe you're evn looking at reshimming :smirk: No way! 60hrs is childs play! I would throw on a new timing chain and thats about it if you're not having any engine problems. I took out my original piston at 212hrs and it seriously still looked usuable. I saved everything I took out in order to show people who question. The suspension would be a neat idea if you already have it revalvd etc. What type of riding do you do? In my experience, OEM internal products are the best way to go for reliablity and peace of mind:thumbsup: :thumbsup:

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Definitly do a Cam Chain. I just had a Valve sink into the head. 21-22 hrs on a YZ450. Regardless I bought it from a guy that used it as his race bike and race pro, I thought I was fine. Do the chain. Looking at a lot of money to repair now...

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I had to reshim a valve at 50 hours. If you don't even look at your valve clearances until over 100 hours, I think your asking for trouble. I guess it just matters how much insurance you want.

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I had to reshim a valve at 50 hours. If you don't even look at your valve clearances until over 100 hours, I think your asking for trouble. I guess it just matters how much insurance you want.

Agreed. I said in a post earlier that I don't get the guys that never check their valves until the bike won't start. If the bike won't start, you've been running with valves out of spec for quite a while and that is a perfect set up for disaster. If you check them regularly then you will catch them within a couple hours of going out of spec and shim them back right, which is much easier on the valve, and could be much easier on your wallet.

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I too would also recommend a cam chain. But thats it. We are going in 2 1/2 years. Im not even going to try and count hours. But its lots!

If it were a honda , then they are throw a way bikes. Be thankful you have a Yamaha. Just ride it!

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Only Bling that does something for performance

Already have these done:

Pro Rekluse Rk chain Pro taper bars Windom

TGT bar subtank system Stainless oil filter

FX graphic's, simply the best, even the logos look the same as manufacture's Cp Piston 13/75/1

ASV and Zeta lever's Air filters 2 Twin air 's and 1 No-Toil

DR.D pipe DR.D Radator lowerering kit

Hour meter 40.00 and DR.D mount

Works connection skid plate

Foot peg ruber boots work good

Fasst Touque wrench ASV sag scale

Fuel tank foam not installed yet

50 tooth sun sprocket going back to 49 Thow

DR.D brake line clamp Lightended it up

Numbered Fuel screw

Ordered over the last three weeks: Neutec tubleless tire setup

SDG step seat in blk

Front and rear wheel bearing kits MSR

Merge Racing - Hydraulic Preload Adjuster

CYCRA M2 hand gaurds WhT

Going with FX Graphic's again

Tm Chain roller and slide kit

0-15 PSI tire gauge bearings Grips

Pro Taper Throtle tube Replaced all yamaha seals and o-rings

Might try 48 tooth rear

Motion Pro Chain alignment tool

Redone the Suspention again with lighter springs this time and a rear subtank.

RDP Suspention work ( Best mod of all was the suspention)

Wish list: Is the new sidwinder TY sprockets with there new chain 370.00 good for life or they will replace it http://sidewindersprockets.com/

Coming soon:

ASV lever set blk in short with boots and hardware, there going on sale for 150.00.

ARAI medium helmet

RXR chest

Inow have wheel set i bought from a guy on Thumper talk Wheel sets are silver hubs with blk rims

Handle bar pad

Tools: Tire changer and Wheel truing stand

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why do you want to to do a rebuild?? 2006 yz450f. 240 hrs , 2007 yz450f 180 hrs. 2008 yz450f 108 hrs. never rebuild or checked valves... lots of oil changes.....

oh man so i just got a new piston for my 06 yz450f for nothing.:smirk: timing chain will do for sure.

i have about 120 hours on my 06 and i never even get close to the rev limiter.

power is in the middle so right after the power go down i shift unless its a hard hill climb.

i mostley ride hill climbs and deep sand if that metter.

my bike jetting is preety rich even in 0c its runing with no backfiring, which is stupid but i dont know much about carbs, i guess my lbs dont know much 2.

it was my first bike in the last 10 years so it was fine.

carb is going to zip ty next week, for the cheaper mod.

so should i throw the piston in or just keep it for next year? i do about 100 hours a sesson.

i guess ill check compression first and see how it goes?

i dont want to take any chances with my baby, i got it with about 30 hours from older racer that dont race anymore.

i heard some guys change piston at 100 hours or less.

sorry on the long story but when its -30 outside ...........:thinking::smirk:

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You might as well change it, you already have the parts. I change mine every 50-60 hours. to be safe. It is pretty cheap insurance.

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You might as well change it, you already have the parts. I change mine every 50-60 hours. to be safe. It is pretty cheap insurance.

ya 120 for complate 08 piston kit.:thinking:

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SAVE it and do the piston in the fall

i have 125 hrs on mine, the valves still in spec from day one.

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I had to shim one exhaust valve on my 06yz450 at 20hrs because it moved a little but now I have 87hrs and still in spec. I recently just replaced my cam chain & tensioner because it started to make an unusual tapping sound and what do you know it went away.

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SAVE it and do the piston in the fall

i have 125 hrs on mine, the valves still in spec from day one.

ya ill try doing a leak down test, if it pass ill probebly keep it.

can i do a leak down test when engine is off the frame?

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i would do a piston and rings and just check the valves to make sure there in spec ( and im sure they are). also do a timing chain..

idk if you asked what piston everybody is useing but i just started to us CP pistions after useing wiseco for years.. reason for the switch is my wiseco wristpin failed and took my motor out so i decided to go with CP.. side by side the CP looks like a better made pistion and the wrist pin on the CP is a lot thicker..

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