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dazzabb

WR450 How many km's you doing before a top-end rebuild?

12 posts in this topic

Guy's,

I'm curious to know how many km's I should be looking at before needing to change the piston / rings on an 05 WR450 used for trail riding?

Had to rebuild the :thumbsup: after a main bearing failure and have a new cylinder /piston/ rings so now being extra cautious with the upkeep.

Cheers

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I did valves, springs, cam chain, piston, rings. etc. after 132 hours of racing/trail riding.

The valves were starting to mushroom and all other parts looked worn. It was time.....

These bikes are not like a TT500. They will not last forever.

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9000 miles and she is making "a little noise" P

parked til i can adjust the valves

no performance problems just noise 1st kick or 1 push of the button and off i go

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I did valves, springs, cam chain, piston, rings. etc. after 132 hours of racing/trail riding.

The valves were starting to mushroom and all other parts looked worn. It was time.....

These bikes are not like a TT500. They will not last forever.

What was the maintenence schedule like? Oil changes? Air filter cleanings? Valve clearance inspection?

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What was the maintenence schedule like? Oil changes? Air filter cleanings? Valve clearance inspection?

Good question! I know of a WR400 whose top end has never seen the light of day and has had only one oil change in the last two years! Not mine! I have 2000 miles on mine (06WR450) with no noise at all, but I change my oil after every other ride, no racing.

A buddy of mine has an 07WR450 that has around 1000 miles on it and it has developed a "tick". Due to new engine design?

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A buddy of mine has an 07WR450 that has around 1000 miles on it and it has developed a "tick". Due to new engine design?

The clutch on the 07 is really noisey especially when its engaged in neutral, but a "tick" is not normal. Mine has 500 miles, valves in spec, and no tick.

Tell your bud to break out the feeler gauges:thumbsup:

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What was the maintenence schedule like? Oil changes? Air filter cleanings? Valve clearance inspection?

Sythetic oil and new filter every 10 hours of trailriding. More often when raced.

I have 3 air filters and I rotate them based on physical inspection.

Valve clearance checked twice a year - middle intake valve tightened up slightly but within spec before the rebuild.

None of the motor parts looked like they were on the edge of failure, they just looked worn. I wanted to replace worn parts before old blue gave up the ghost. Pay now or pay later.....

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Sythetic oil and new filter every 10 hours of trailriding. More often when raced.

I have 3 air filters and I rotate them based on physical inspection.

Valve clearance checked twice a year - middle intake valve tightened up slightly but within spec before the rebuild.

None of the motor parts looked like they were on the edge of failure, they just looked worn. I wanted to replace worn parts before old blue gave up the ghost. Pay now or pay later.....

Sounded like a healthy top end. Did you loose compression? IMHO 10 hrs. on oil is a long time on these bikes even if it is trail riding. These transmissions shear oil like no other. Usually the yamaha valves go a long time after the first adjustment unlike the honda CRFs

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I changed mine out for a high comp at about 4500kms I think from memory.

The piston and rings were still in great condition (although covered in carbon)!

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