Author Topic: Dreaded Front Sprocket (Read 11999 times)

Andy Clap · « **on:** 03 April 2012, 02:16:37 pm »

Just took the sprocket cover off for a bit of cleaning/inspection. Found that the sprocket is only being held on by the tab washer. I was a little surprised as although I knew of others having the problem it never happened on my previous Fazer.

Quick Google search found this excellent site and article...
http://foc-u.co.uk/index.php?topic=92.0

Within 5 minutes I'd phoned the local stealer, they'd taken my details and submitted something to Yamaha. Waiting to hear back to get it booked in and fixed.

Many thanks to John Silva for the topic.

Andy Clap · « **Reply #1 on:** 03 April 2012, 02:35:52 pm »

Quote from: Andy Clap on 03 April 2012, 02:16:37 pm

Many thanks to John Silva for the topic.

Sorry, just noticed the original article was by Slidesvill.

Andy FZS · « **Reply #2 on:** 11 April 2012, 03:12:34 pm »

Hello, How did you get on with Yamaha? I've noticed that my sprocket nut is the old 9mm size and I'm not sure if I should just buy a new one or ask Yamaha to change it. As the bike is 03 with 37k miles I'm not sure how interested they will be.
Andy

Andy Clap · « **Reply #3 on:** 11 April 2012, 05:54:00 pm »

Hi Andy

They haven't got back to me yet, I'll chase them in a day or so.

From the article (see link in first post) it shouldn't matter how old the bike is or if it's been serviced outside the dealer network. I guess the dealers get paid by Yamaha so probably don't give a toss how old it is.

Mine is a 2002 with 13.5k miles.

I'd give them a bell and ask.

Cheers,
Andy

Captain Haddock · « **Reply #4 on:** 11 April 2012, 06:43:00 pm »

For the sake of less than a tenner buy one and save an expensive gearbox rebuild, if you already know theres a problem and a cheap fix you will only have yourself to blame.
I have a shiny new nut and tab washer, it has been sitting by the bike for months now, maybe I should fit it...

Fazerider · « **Reply #5 on:** 11 April 2012, 07:04:05 pm »

Fitting the correct nut myself seemed the easiest choice, faffing around and getting it booked in to suit some dealer's timetable would have been far less convenient.
What still amazes me is that when parts suppliers look up the part number on their microfiche and ask for the old nut, Yamaha still provide it instead of automatically sending the upgraded version. Now maybe the part is common to some other bikes that don't require the newer nut, but knowing that if it is for an FZS600 they could end up footing the bill for a final drive shaft replacement they ought at least to query it.

Andy Clap · « **Reply #6 on:** 11 April 2012, 08:06:37 pm »

Quote from: Fazerider on 11 April 2012, 07:04:05 pm

Fitting the correct nut myself seemed the easiest choice, faffing around and getting it booked in to suit some dealer's timetable would have been far less convenient.

But there is a known fault with some output shafts being too small. They will replace the shaft if need be. With a crap shaft the nuts will come undone whatever.

Captain Haddock · « **Reply #7 on:** 11 April 2012, 08:24:34 pm »

The shaft is only too small if the nut has come loose and buggered it up, if the nut is still tight and always has been the shaft should be fine, I don't think there were any bad shafts made, I stand to be corrected...

Andy Clap · « **Reply #8 on:** 11 April 2012, 08:34:45 pm »

Quote from: Captain Haddock on 11 April 2012, 08:24:34 pm

The shaft is only too small if the nut has come loose and buggered it up, if the nut is still tight and always has been the shaft should be fine, I don't think there were any bad shafts made, I stand to be corrected...

That would make sense, especially as the mod is a wider nut.

Andy FZS · « **Reply #9 on:** 12 April 2012, 01:02:48 pm »

Contacted main dealer regarding the dreaded nut and their reply was"Unfortuately the Yamaha FOC campaign has long finished" Locknut £4,20 washer £4,10 inc vat. So hopefully the shaft is ok and it's going to cost £10 for piece of mind.

Andy

limax2 · « **Reply #10 on:** 12 April 2012, 07:55:30 pm »

Andy FZS. When I bought one the nut and lockwasher came together in a sealed plastic bag and described as a "nut and lockwasher kit" Part No. 90891-10124, for about £4.50. That was a good while ago so I suppose it may have changed now. Just make sure they give you the 12mm wide nut before you hand over the dosh.

davec · « **Reply #11 on:** 12 April 2012, 08:04:55 pm »

Yamaha will honour this.I contacted them a couple of months ago (Yamaha uk head office)and spoke to them.They wanted the bikes frame number and mileage.If it fell within the affected batch I could take it to my nearest main dealer and have it checked and rectified if neccessary.As it was I ended up doing it myself,less hassle.My bike is 11 years old with some service history but this made no difference.

Newgolddream · « **Reply #12 on:** 12 April 2012, 09:21:09 pm »

Checked my front sprocket last year and found nut and shaft completely knackered. Contacted local dealer (Skellerns) they checked with Yamaha and, after taking a few measurements, agreed to fix the whole lot FOC! And this on a 12 year old 28k bike. The repair took longer than ideally i would have liked (about 3 weeks) but i was just amazed they agreed to do it. You also get a free oil and filter change out of it

.

Andy Clap · « **Reply #13 on:** 13 April 2012, 11:11:01 am »

Just chased CMC Clay Cross, they are waiting for a modification number from Yamaha and will then get it booked in.
I want them to do it as the nut is loose (although held by the lock washer so only about 5 degrees free movement) so there is possible shaft damage.

Using the part number quoted above I found this which illustrates the new nut and washer nicely...
http://www.bikesandtravels.co.uk/default.aspx?pagef=203&l1=Biking%20Blog%20Yamaha's%20Stripped%20Loose%20and%20Lost%20Sprocket%20Retaining%20Nuts

Will keep you informed...

edc · « **Reply #14 on:** 13 April 2012, 12:04:31 pm »

Hi all,
I checked mine out a few months back (in the snow...) and my nut was indeed the wrong one.
Replaced it with the correct nut after checking the shaft thread was OK.
If it helps, I've added some pics.
Why Yamaha didn't notice this in production is beyond me...
EdC

edc · « **Reply #15 on:** 13 April 2012, 12:05:12 pm »

And this is the kit contents for those interested!

Panthor · « **Reply #16 on:** 13 April 2012, 01:00:20 pm »

Thanks for those pics, checked mine and it has the old nut, no signs of any wear yet though. printed off all this info and will be taking along to my dealer to make sure they order the correct nut.

Fazer Jake · « **Reply #17 on:** 13 April 2012, 01:44:09 pm »

Is it absolute necessary getting this sorted? I'm pretty sure mines the smaller nut $:\$ however i was told it never effected the 2003 foxeye models?

Will have a check tonight

Panthor · « **Reply #18 on:** 13 April 2012, 03:17:52 pm »

well mine is the 2003 foxeye and for the sake of £4 id rather have the piece of mind that its done, rather than being paranoid and checking every weekend.

wraith600 · « **Reply #19 on:** 13 April 2012, 04:16:38 pm »

ba bla bla still using the original with no issues

edc · « **Reply #20 on:** 13 April 2012, 04:53:28 pm »

I had no issues with mine either. Neither did the Yamaha stealer in Cambridge that re-fit the old one when I had the sprockets/chain changed a year ago. Neither did they mind reusing the tab washer. In fact, this is one of the main reasons that I serviced the bike myself last month.

In my mind, it makes more sense to replace the nut for a tenner onto a drive shaft that still has thread on it, rather then wait until it all goes up sh1t creek.

spoonman · « **Reply #21 on:** 13 April 2012, 05:12:42 pm »

Noticed a jingling sound exactly like house key on top yolk last week.. Twas the dreaded nut! 9mm and was completely stripped. Shaft was grand, 17.5mm and threads ok. Just replaced it with 12mm one.

This was on 2001 with 28k

Captain Haddock · « **Reply #22 on:** 13 April 2012, 05:27:33 pm »

I think the original is ok until someone gets heavy handed changing the sprockets, as most of us probably do, then it's just too borderline on it's strength, as for re-using tab washers I've always done that if they look ok and only changed if they are looking worse for wear.
I bet if you always use an accurate torque wrench to tighten the nut it'll last years but most of us go for the 'rather tight than loose' approach which is when you need a bit of extra strength than just whats needed and no more.

b3tarev3 · « **Reply #23 on:** 13 April 2012, 08:20:19 pm »

Mine was ok on a 98 model but decided to change it for piece of mind - the cnuts at the Yam stealers sent me the wrong nut, this was despite me repeating the issue to them!!

Part no 90215-21290

davec · « **Reply #24 on:** 13 April 2012, 08:27:48 pm »

Mine was fine when I checked it but changed it for piece of mind.I've read that Yamaha recommend that the new fatter nut it torqued to 90 nm,where as the original one was 70 nm.I did mine to 80nm and a few drops of blue lock-tite.