1999 R6 sprocket nut went through engine casing

[john2]

As the title says, i was accelerating in second gear earlier and must of hit about 70 and suddenly heard a big bang, oil went everywhere all over the back wheel and how i stayed on i dont know.

Anyway, I took the sprocket cover off when I finally got it home and noticed the nut was off the sprocket so im presuming it came off, it has snapped one of the mounting points for the sprocket cover clean off the engine, exposing a gearbox bearing.

My question is, is this a whole new engine job as you cant just replace that part as its part of the whole crankcase? And where is the best place to look for one?

If not do people suggest I sell the bike for repairs or in parts?

Here are some pictures of the damage:

https://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/284217_10150256968335793_516335792_7722613_6199813_n.jpg

https://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/216632_10150256968965793_516335792_7722626_5535857_n.jpg

Many thanks, John.

[koolio]

Don't know the model so wouldn't know whether you need a full rebuild but this is extremely worrying, just how does something like this happen?

This is something you see on a Chinese bike but a major failure like that on a Jap bike, has me stumped.

[Blau Zedong]

It's scrap. You have two choices -

a) Take a chance on slinging a second hand engine in it off egay / breaker.

b) Break it.

Choice is yours depending on how much you like the bike and your inclination to put work into doing an engine change.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[john2]

Well i have only had the bike 2 month so i presume it was never tightened but the previous owner, im kicking myself about not checking it, but at least im alright i suppose.

Im guessing engine change isnt a simple swap, there could be issues, i would like to keep it as i havent had it long, but i have slightly been put off riding it also.

[mattsprattuk]

order JB weld and use that. Make sure the entire surface is oil free until its fully cured (takes about 48 hours to be sure)

I had the exact thing happen to my r6. chain knocked off the engine casing lump leaving the same bearing exposed.

Mine held for over a year until i crashed on the left hand side at 100mph and took out a signpost.

If you're local i'll do it for you.

it's far from scrap.
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[john2]

[mattsprattuk]

only if you do it properly. I tried all sorts of stuff from brazing it to getting it welded.

Brazing wouldn't work because the casing would need to be hot enough to melt the brazing rods to make it bond properly, possibly ruining the exposed bearings by exposing them to a flame for that long. Plus all the electrics local to the area (IIRC a generator wire runs up the side, and the loom runs overhead, as well as the starter motor)

Ally welding needs the casings to be heated pretty highly too, so unless you strip the engine, that won't be a very good option for the same reasons...

this was a last resort for me and worked perfectly.

Solvent cleaned the area using Ardrox blue from work, then keyed the area with coarse sandpaper.

MAKE SURE THE WHOLE AREA'S FUCKING CLEAN.

mix 50/50 jb weld hardener and substance

apply thinly to the engine casing on the broken parts

apply thinly to the broken parts of the chunk knocked off

offer up the chunk, and put on the sprocket cover so it holds it in place and keeps the bolt hole aligned.

after about 4 hours or so, take off the cover (should have set enough to hold it up by then)

Apply generously everywhere possible. Use the entire tube to build it up. It's awkward to get it into the places at the back, but it's important that you do.

leave it a couple of days without starting it, as oil only travels up when the engine's running

that's about it.

like i said, the only reason mine ever failed is because the bike went down hard on the LHS
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!!
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith

[Fortuna]

And buy a new lock washer