WR450 2006 please help with top end rebuild...
Posted August 06, 2008 - 10:38 AM
could help me with top end rebuild in my Yamaha WR450 2006
I just hit 6500km and for me its still has a lot of power but I wont make rebuild beter now then have the change that my engine will blow. I cant understand how some of the guys rode 10.000miles before top end rebuild ?!?!....
I found that its started to burn the oil a little bit (its not smoking when I start the engine or something, just found that after 200km I had to add about 50~80ml)
I have the bike from brand new Im the virst owner I change the oil every 500-700km with filter. I checked valves every 1500km for right now all in spec.
I want to order parts from usa because here in poland I have to pay 2-3 time more. I want to order them before winter that I can split the engine and replace everything. Until this day I will keep rideing.
What should I change ?
1 Piston (should I go with OEM or aftermarket ? and should I first measure the cylinder then order piston or can I order without any problem Oryginal Size Piston (standard) ?)
2 Chain + dampers, chain tensioner ?
3 Valves, seats, retainers, lifters, guides,springs ?
4 Rod or complete Crankshaft (OEM or aftermarket)
6 complete bearings for linkage,shock,swingarm ( Pivot Works are they good or shoul I stay with OEM ?)
Please if you could help me with this, maybe I should add something to this list or remove from it. For any advise I would be really apriciate.
I want to ride next 7000km without any problems I dont want to change my piston and after 2000-3000km my rod will broke or something elese I hope you know what I have on my mind :-) ....
Very sorry for my english :-( ......
Posted August 07, 2008 - 05:33 AM
TT aftermarket has great prices, TT OEM has some of the best I've seen on OEM goods. (they are different outfits and will ship from different locations).
[COLOR="Red"]1 Piston (should I go with OEM or aftermarket ? and should I first measure the cylinder then order piston or can I order without any problem Original Size Piston (standard) ?)[/COLOR]
I would stick with OEM if you are not going to mod the bike - BUT - for the money - WISECO makes a very good aftermarket OEM replacement piston kit that will not change your performance.
With your low hours you won't need to check the Cylinder - likely it will still show cross hatching - definitely get it honed though to seat the new rings.
[COLOR="Red"]2 Chain + dampers, chain tensioner ?[/COLOR]
You will only need the Timing chain, if you really want to - also get the tensioner, but likely yours will be fine for some time to come. I've never noticed any wear on the dampers yet - even on very used engines.
[COLOR="Red"]3 Valves, seats, retainers, lifters, guides,springs ?[/COLOR]
Valves, you can go with an aftermarket Kibblewhites or other kit - should come with springs and cotters, seats need to be cut by a shop. Seals should come with the gasket kit I described below. There are no lifters. I would buy a full shim kit or a variety of HONDA shims - Honda shims come in more sizes and are exactly the same diameter.
Valve guides rarely wear, you can probably do 3 sets of valves while keeping the original guides.
[COLOR="Red"]4 Rod or complete Crankshaft (OEM or aftermarket)[/COLOR]
Crankshafts can also come as a complete assembly including the rod - if you are going this deep, replace the bearings as well, they're under 30 a piece
Only buy the rod/bearing separately if you are able to or have access equipment or someone who can put it together properly.
Get a complete aftermarket gasket set from TT - it usually includes every gasket and seal right down to valve stem seals and orings - anything you don't use can be stored for when it's needed.
I got the Moose Racing gaskets complete with oil seals and was extremely happy with it:
6 complete bearings for linkage,shock,swingarm ( Pivot Works are they good or shoul I stay with OEM ?)[/COLOR]
Get the pivot works - they're fine and a good price - while you're at it get a set of wheel bearings for front and back, a clutch, several spark plugs, a few oil filters, new sprockets and chain as well as fork seals - these are wear items needed eventually and you'll get a much better price on them in the US and save on shipping if you add it all to this order.
Heck - get new rubber while you're at it!
hope this helps a bit.
Posted August 07, 2008 - 07:14 AM
Posted August 07, 2008 - 07:27 AM
Posted August 09, 2008 - 12:02 AM
Thank you very much its help me a lot,but one thing if I will hone cylinder can I still put standard size of piston ? or should I go with a little bigger ?
and other this Kibblewhites valves are made from steel and the OEM are from titanium its not a problem ? and they are only for YZ450 are they the same for WR450 ?
I read here on forum that some people hit over 10.000km without any problems but some make only 4000km and they have a big problems, its depends how you ride and what terrein you have.
And I hit my bike really hard in terrein....
About oil I have tryed to change on different oil in last time and it didnt help its still disaperaing a little bit after every ~200km
And its stills start without any problems after every kick or electric start, and still strong also.
Thank you for the words :-), but I know I could be better if would lear more and have a little bit more time.