Compression test :)

[Tankbag]

Sorry your YZF engine is stuffed, a slipped cam chain killed my Pug S16

[Ricky]

Sorry your YZF engine is stuffed, a slipped cam chain killed my Pug S16

 

Thanks dude

Some pictures I think the piston has gone on it, I emptied the oil as well and the magnetic thing that's attached to the sump bolt had no pieces of metal on it, I'm assuming that's good?

The piston is well and truly f**ked.

http://imageshack.com/a/img18/2890/6xvu.jpg

http://imageshack.com/a/img547/6529/hvmz.jpg

http://imageshack.com/a/img35/8734/ei47.jpg

Anyone else like to share their experienced input please?

[Mr Fro]

Seen better days old bean.

Is that a load of swarf on the top of the piston? Also, what does the head look like - are the valves alright?

[Ricky]

Hey mr fro

Indeed it has

I haven't a clue what that layer of black stuff is on the top, the head was okay, didn't get to snap a picture of that, I've got a replacement head from my seized engine which will be replacing the old one, the chain was all good, the cog the chain was attached to was all good no missing teeth

The crank shaft, span ran around without any noises at all

I think the piston wiped out my cylinder at the same time though

http://imageshack.com/a/img546/6150/2iry.jpg

http://imageshack.com/a/img42/8595/ucdy.jpg

[Fozzie]

This is a known fault with the YZF...

Something about the piston skirting letting go and it letting go the violent way

Needs a top end rebuild

[Mr Fro]

Ouch!

Look like it's a bit beyond honing from the pics! New cylinder and piston set and you're ready to go.

[eastanglianbiker]

if you havent found any big amounts of alloy swarf then you need t o check things out as it means it could still be laying in the bottom of the engine and also in the alternator case and clutch case.i would be taking both off to check all is clean and ok in there

[Joeman]

Yep, all that missing metal has to have gone somewhere!!

I'd still be looking on eBay for a replacement motor as cleaning that mess up will be a big job.

[Stu]

wonder if you can get a 2mm over bore on that thing

I think you will be better getting a new motor to be honest

[Ricky]

But surely if I can clean the crank cases, get all the shit out, I wouldn't need to buy a nw engine?

I'd much rather put extra work in to it and spend less money than more money for less work?

[Stu]

price up the parts and see what the difference is but i cant see it been cheap

plus I would be looking at doing a full rebuild as you dont know what is already on its way with the shit been in there

[Joeman]

Full rebuild. You're gonna have metal fragments all through the bottom end. Anywhere the oil can go, so too can the metal fragments.

If a replacement engine is only 300quid delivered that's by far the best option IMO. Time is money and there's a lot of time and replacement parts needed to bring that back from the dead.

[Guest]

Damn Ricky!!! That piston!!!!

Im sure if you give you engine the necessary checks, like big end bearing etc, you could get away with just a top end rebuild..

After all, thats what oil filters are for, the shards of metal in the oil...

Could always get some engine flush, and give it a good flush out before hand...

be even better if the barrel score wasnt so deep, could get the barrel re-bored and fit a new piston

[Ricky]

I guess I'll have to get a new engine if you guys think that's best

I guess engines won't run all to well with tiny fragments of metal in it

There's not a great lot a of metal missing off the piston?

A new cylinder and piston set is half the price of the another engine

I'd rather spend that other half on the engine for the TZR

Hmmmmmm, not looked at the oil filter yet Allan

Where does the oil go around? Gearbox, alternator?

[Guest]

it runs everywhere mate.

Gearbox, cools the stator coils, the crank shaft splashes it up into the bottom of the piston and barrel, the piston oil scraper rings scrapes it back down, and goes up into the head to lubricate the valves/tapets.. etc

[Stu]

oi goes everywhere

if you can I would be tempted to strip the motor down before making a decision

[Ricky]

I'll strip it down first take some photos, show you lovely people of TMBF and then once you tell me it's f**ked I'll have to buy a new engine

It'll be this weekend when I get some photos

Can anyone give me a list of tools I will need to take it apart , please

[Fozzie]

You will need a 1/2" torque wrench to put it back together

I'm looking at reputable brands to use for a top end rebuild Ricky don't worry

If you're still in a spot of bother end of next week remember I'm up so should be able to help.

Can see the pictures properly now and I can tell yours has suffered the same fate as many YZF's do.

Pull the oil filter and check for metal shards in there. Usually what happens is the piston skirt begins catching for some reason and it buckles and slaps about. There won't be much in the way of debris but it just takes one bad bit to cause havoc.

So if confident get it to pieces and try cleaning all the major components, if not leave it alone

[RantMachine]

The engineslayer strikes again

[Ricky]

The engineslayer strikes again

 

Bike slayer*

I had oil in this bike so there was nothing else I could do

It had 14k miles on it and you have to almost red line it every where to move

[Grumpy Old Git]

Look at it this way - You want to learn all about motorcycle engines?

Then take this oppurtunity - Do a full strip down, clean and inspection.

If there is more significant damage elswhere, then replace the complete engine, if not, then rebuild the top end, put everthing back together (new gaskets / seals are a must).

As to the top end rebuild, re-bore if it will take it, or, get the barrel turned out and a sleeve fitted. or even replace the cylinder for a new one, new piston, etc.

If you get stuck somewhere on the tear down, take piccy, explain your problem and someone on here is bound to have the answer!

Go for it!

[Ricky]

Thank you GOG

I've ordered my Haynes manual and looking at different tools that I'm going to need to take it apart, I'm very nervous about taking it apart because I've never delved that far into an engine before

What would I need to clean the engine? Just some paper towels and elbow grease? Is there anything in particular I'm looking for?

A new piston, cylinder and a gasket set is about 170 quid so I'm going to get that once my new card has come so I can use online banking again

[Mr Fro]

Nothing in the rule book about not sticking a hose through the engine to give it a clean out if you're going to do a rebuild!

Look at it this way - if it's buggered anyway then you can't make it much worse.

[Ricky]

http://imageshack.com/a/img716/8564/8b83.jpg

So, it begins...

[RantMachine]

Stuff that, who needs a Haynes when you have Fozzie

(Kidding, I've got my Haynes now too so less daft questions from here on, I promise )