I have a 2007 WR450 with about 425 miles since new. I thought that I would check the valves and have found that they are out of spec so will need adjustment.
However, when I align the rotor mark with the mark on the casing through the inspection hole the punch marks on the camshafts to not align with the cylinder head surface. The punch marks on the camshafts look as if they are level with a spirit level and not the surface of the cylinder.
When I turn the crank so that the camshaft marks are level with the cylinder the mark on the rotor is about 4mm past the mark it should be aligned with. I have taken a picture of the camshaft marks showing how they are out but I don't know how to upload the photo (can anyone help).
It is very unlikely that anyone has dismantled the engine or even adjusted the valves given the low mileage and the way the bike was when I found it. Is it possible that something is wrong or is what I am describing normal. The bike was not running too great but not running that badly either.
Any thoughts or advice would be greately appreciated as I'm not sure what to do now.
When you say out of spec what exactly are the valve clearances you have measured?
The WR valve train is very robust and known to go well over 10K miles without need for adjustment so an adjust at 425miles is very unusual
Normally the gap closes up, which actually increase valve lift so makes the engine run stronger
Bad thing about this is that once the valve clearance is zero, the valve can't loose its heat as it seat in the head and so overheats and burns out
The bike is also very hard to start from cold with zero valve clearances
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Do you know if the ProX shims are good or should I try and stick to genuine Yamaha. It seems that here in the UK these are my only two choices.
Any 9.48 dia shim will fit
Hotcams, Yamaha, Suzuki, Honda etc
Most dealers will do a swap for a nominal fee - Find your nearest road bike main dealer and pop and see them.
My local road bike dealer swaps them for a couple of quid
examples of some prices
OE Suzuki shims are £4.29 ea (12892-41C00-230 - this is the part number for a 2.30 shim, as indicated on last 3 digits - just changes these last three digits fro correct size you want and you have the part number)
eBay - http://www.ebay.co.u...=item2c7856d261
eBay (Hotcams at £1.75 ea) - http://www.ebay.co.u...=item3389210740
eBay (Hotcams at £2.64 ea) - http://www.ebay.co.u...=item3ccbb7d345
Yamaha shims seems a bit pricey at £8 ea!!!
Edited by GuyGraham, December 30, 2013 - 07:28 AM.