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tarmac_terrorist

why did I buy a WR?

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I bought in o7 wr450f in 2007. The engine has no more than 30 minutes on it. Never wridden, just turned over from time to time. As im now in a position to wride the WR I've set about servicing it. Whilst servicing the bike, it was noted that coolant was leaking from the weep hole. The parts where ordered and today I cracked open the crankcase cover to replace the defective seals. The effin impeller shaft is worn/grooved. THIRTY MINUTES OF USE and the shaft is toast. What a piss take. The impeller bearing is 'gritty' as well. I've cleaned the bearing but its still not stictionless. *** did I buy this bike? To be reliable...

So why has the impeller shaft failed?

*** is wrong with the workshop manual. It gives BS advice like "remove the header" if removing the rhs crankcase cover. Equally "remove the seat and left side rear panel to drain coolant" FFS its a sodding press clip that holds the coolant pipe on. 10 seconds work to drop the pipe. Yet the manual states to remove bodywork.

Equally why in gods name did yamaha not sink an allen fitment in the impeller shaft so you can hold the shaft whilst removing the impeller. Imo bad design. Then there is the Ti valves. WHY do the r6/r1 ti valved bikes get away with thousands of miles of use without need to adjust the valves?

Not happy. Next time I buy a bike it wont be blue.

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Well,, I would say whoever sold you the bike and said it had only 30 minutes on it,,,,,, lied....

I've got 8 desert races and many rides on mine, without a issue.

Love my Yamaha! !

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5 years and thousands of miles on my WR. 60 percent road 40 percent trail including a lot of hard verticle riding.

Oil changes, cleaning the air filtre and 2 valve inspections ( with one adjustment) is all I have had to do!

Reliable and exciting bike ... after owing a dozen dirst bikes, blue rules!

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Did you buy it new? I've got at least 3,000 miles on my wr400 (1999) and that's just me who knows how many miles were on it before I got it last year. The WR is one of the most reliable bikes ever made (IMHO). But then again you are in the Yamaha forum so your going to have a hard time getting someone in here to tell you otherwise.

Austin

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Apologies for ranting. It was a crate bike purchased from a Yamaha dealership and was/is new. Whilst spannering off the impeller my hand slipped resulting in a butchered hand. Three cuts in total, one of which went through my nail. Was not sure if it would require stiches. Seems ok though. Will need a tetanus shot tommorow though. No doubt it is a highly reliable bike- if the maintanence schedule is adhered to.

Best guess is that the bearing is defective causing the impeller shaft to fail. Im going to a bearing specialist for a replacement and will order a new impeller.

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Apologies for ranting. It was a crate bike purchased from a Yamaha dealership and was/is new. Whilst spannering off the impeller my hand slipped resulting in a butchered hand. Three cuts in total, one of which went through my nail. Was not sure if it would require stiches. Seems ok though. Will need a tetanus shot tommorow though. No doubt it is a highly reliable bike- if the maintanence schedule is adhered to.

Best guess is that the bearing is defective causing the impeller shaft to fail. Im going to a bearing specialist for a replacement and will order a new impeller.

Honestly, these bikes are as reliable as they can get. However, there are flukes once in a while, yours seems to be the one in a million exception. Change the bearings, seals, and shaft, it should be good after that. I have an 07 that I bought new as well, it has been rock solid.:worthy: Take it as a learning experience and have a beer doing the job. Yesterday I upgraded my cams to yz cams, my hands took a beating too, but it's all good.:lol:

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I've just fixed my coolant leak on my '07 I bought used last Nov, it was not run for few months (the needle valve in the carb was gummed) and leaking coolant on cold engine quite badly, standing long time does affect the seals so that might be why yours is leaking, it takes some reving to groove steel shaft with rubber so if your bike is brand new might be just discolouration that would polish off?

As to the manual you're right , it tells to take off more bits than needed, just ignore,

I had a go on RMZ450 and YZ450 last year and was instantly hooked to the viscious feel of these engines, compared my XTZ660 was like riding a donkey, I bought WR after studying various forums it did sound most reliable out of the other bikes in the class, compared to standard (non-competition) bikes the maintenance schedule is tight but it's price you pay for big grins while riding

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Thanks for being sound guys. Major league rant there. Was deeply pissed at spending hours looking for lost tools then butchering my hand & went uber mental when I saw the shaft. Yup im a dick for letting the bike stand for so long. Was totally smashed with illness though and unable to look after her properly. Given that I've been qouted £33 for a new impeller shaft, i've sniffed over the 'defective' one. No grooves per say just 'polished'/worn bits.

Imagine a pencil. Then imagine gently sliding your fingers along the pencil. Thats how I expected the shaft to be. However, there is a 'dip' in the pencil/shaft after a few cm. which continues along the shaft. Im hoping thats machined/intended and not as a consequence of wear.

Any tips on cleaning the carb? I've googled this senseless and got nowhere. It seems chemical agents cant be used but the carb needs cleaning.I've stripped twin forty dellortos before and never again. What other work should I be doing? fork seals?

Ta

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Thanks for being sound guys. Major league rant there. Was deeply pissed at spending hours looking for lost tools then butchering my hand & went uber mental when I saw the shaft. Yup im a dick for letting the bike stand for so long. Was totally smashed with illness though and unable to look after her properly. Given that I've been qouted £33 for a new impeller shaft, i've sniffed over the 'defective' one. No grooves per say just 'polished'/worn bits.

Imagine a pencil. Then imagine gently sliding your fingers along the pencil. Thats how I expected the shaft to be. However, there is a 'dip' in the pencil/shaft after a few cm. which continues along the shaft. Im hoping thats machined/intended and not as a consequence of wear.

Any tips on cleaning the carb? I've googled this senseless and got nowhere. It seems chemical agents cant be used but the carb needs cleaning.I've stripped twin forty dellortos before and never again. What other work should I be doing? fork seals?

Ta

I don't think the shaft is worn with only 30 minutes of running time, that would be very hard to do. My theory is that the rubber seals got stiff from sitting too long without use, they hardened and didn't seal out the coolant anymore. No biggie, it's just a matter of replacing the seals with a fresh set. As for the carb, I'd remove the bowl, needle, and main/pilot jets. Once those parts are off the carb, they can be cleaned with solvents, just be sure not to mess with the bowl gasket too much. With those parts removed, the rest of the carb can be cleaned with an air compressor, just use a thin nozzle to shoot the air through the carbs passages. The fork seals should be fine, even if they leak a little bit, they can be easily cleaned with a piece of thin plastic or 35mm camera film. I used my wr for 2 1/2 years through dirt, mud, dust, everything. The seals only needed to be cleaned once and never leaked again. Can you post a picture of the water pump impeler shaft? I'm pretty sure it's in usable shape.

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I'm extremely happy with my 2007 WR450. Only mods are the GYTR kit.

Best stock suspension and engine setup I've ever ridden, including zooks and KTMs. I've done lots of enduros with it, and I'm convinced it's the best WR ever. Bulletproof for me.

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Sorry to hear you woe's

hope all good after

not trying to rub it in... but i have about 3500kms on my 2008 wr 450... yet to have a single problem.. bike is totally solid :lol:

cheers

Warts

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Piss Take?

I have never heard of that one before

Im not sure of its meaning

Can you use it in another sentence for me?

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man sorry to here that, I love my 09 WR, sold 2 KTMs so I could have a my bulletproof WR.

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