Top end SECOND UPDATE Pics!

[HunterDan]

ok i finally got the cylinder off and this is what i found!

To me (not an engine expert AT all) it looks like the piston is broke??? BUT i cannot find the other piece. is it possible it fell into the bottom end and what can happen if it did?

The cylinder wasnt that bad at all im leaviung now to get it honed.

 

[ron89]

yea looks like the bottem of your piston broke off .. does it still turn over? nice and smooth ... cause you may have the replace you rcrank bearings of maybe just flush them out ..

 

[Braapbraap95]

Yeah, you're pretty screwed. Same thing happened to me, peices got lodged in and scorched the crank, now i have a stroker! and -$1700 D:

 

[ron89]

yea you could always send your bottem end to some 1 on here .. i got a price quote of around $285 for the stroker 3mm.new crank seals & and crank bearings, crank install and return shipping .. not bad at all ..

 

[HunterDan]

if i push on the kick starter it goes up and down smooth.

what should i do?!

should i try to rebuild the top end and see if it works?

 

[ron89]

if i push on the kick starter it goes up and down smooth.

what should i do?!

should i try to rebuild the top end and see if it works?

yea if the cyli looks good then i would rebuild it .. for the bottem end i would maybe flush it out so if there is any metal shavings it wont come up when you fire it up ..

 

[xjma]

Was it running when you took it apart?? Is there any play in the main bearings or the crank bearings?? Can you see any pieces in the bottom end??

If it was running and there is no play in any of the bearings, and you can't see any obvious damage in the bottom end from pieces of piston, I'd remove the engine, tip it upside down and see if you can't get some chunks to come out. Use an air blower and shop vac. Diesel fuel works good for cleaning out the crank...after it's used dispose of it with used oil.

Ideally, if you see the whole bottom of one side of the piston skirt missing, you'd want to split the cases and redo all the bottom end bearings, etc. However.....you may get lucky, who knows??? If it was running before you ripped it apart, it's possible you might get lucky, but "get lucky" is the key term here.

Here's a pic of a stock piston. See how much you're missing!!!

It's normal for the piston skirt to crack there....but usually if that much falls off before you take it apart, the motor isn't too thrilled.

 

[beachblaster]

ive had the same thing happen on my 06. piston broke and fell down in the crankcase. sorry no pics or neither do i kno wut all was broken besides that cuz it was under warantee so i myself never tore it apart

 

[HunterDan]

it was not running when i tore it apart. so i guess ill try to take the bottom out and try to shake it out


i just looked inside and i didnt see any part of it.

what else can i do? try to drain the oil?

 

[xjma]

you'll need to drain the oil before you split the cases...and it's a good idea to drain it before putting the motor upside down.

It's probably best to split the cases and redo the crank and main bearings...just in case. Are the ports all marked up from pieces of aluminum going through them??

You could try to just throw a new top end in there, but it very well could just fail right away and they you would have wasted all that time and money and have to do it all over again...

 

[HunterDan]

sao i can drain the oil first. then i have to split the case. are there screws or what?

And also were are the ports?

 

[xjma]

So you've never split cases, huh?

Yep, drain the oil first, or once you split the cases open it will fall out all over the place and make a mess.

Best advice is to get a good manual for the blaster that includes pictures and such. You'll have to remove the entire motor from the chassis and do this on a bench. If you're not confident, have a friend help....or last resort, have someone else do it. It's really not that bad of a job, but if you're not good at taking things apart and putting them back exactly the same, then you may F it up and then have to do it all over again.

The ports run from the crank case up through the cylinder walls. It's where the fuel comes in and where the exhaust goes out.

 

[HunterDan]

this is my first time messing with any engine. but i figured it it isnt running, how much more could i mess it up?
So ill drain the oil and split the cases (bolts holding it together?)

I marked your pic, thats about were its broken off

 

[HunterDan]

ok i just drained the oil and there didnt look to be any metal fragments in the oil.

i also looked at the ports and they appeared to be smooth. good or bad?

 

[Sum0n3]

I honestly think it's not such a good idea you try to do the cases yourself if this is your first engine. That being said here is a few things that might help.

First thing you should do is download the Manual. This will show you step by step how to rip it apart.. and yes there is bolts holding it together.

There is a special tool you will need to get this done. Mainly a flywheel puller as it's nearly impossible to get the flywheel off without it. The flywheel has to come off for this procedure as there is bolts under it holding the cases together. Second useful tool is a steering wheel puller to help get the cases apart(can be done other ways too, tho this is safest).

If you decide to do it then the best advice I can give you is take your time and look through the manual a few times.

 

[hickskateboarder]

didn't it break the exhuast side of the skirt off? it's possible it just shot out the port and is sitting in ur pipe. rattle the pipe around and dump it out and see if anything falls out. normally when when a piston skirt brakes off it goes down into the crankcase and lodges itself in there and seizes the motor. it is possible that you could still turn it tho, at the very least flush the bottom end. splitting the cases is the best idea tho. then while ur in there if you want you can throw a stroker in

 

[blaster biotch]

ya i withh hicksk8tr. i have always broken the exhaust side off the piston. and ditch the autolube and premix ur gas. its not to difficult to rebulid and chances are the is aluminum melted in the bottom end bearings. you wont see any fragments in the oil because the compartment in totally separate from the crank housing.u will see when u split the case. take ur time and i use a Rubber mallet to tap around the case. DO NOT PRY IT APART. it is held togrther by a bunch of phillips screws and make sure u use the correct size screw driver

 

[xjma]

Yours broke off on the other side, but yeah, that looks like about the amount of material that is missing!

I hate to tell anyone to take something to a shop (definitely don't bring it to a stealership, unless you've got money growing on trees!) but I do agree that splitting the cases probably isn't the best thing for a beginner. It never goes 100% smoothly, and with no experience making things like this happen....it will be tough. It's not impossible though.

I would print out the factory manual from the DIY section, and pick up a clymer or haynes manual too if you're considering doing this yourself. If you're patient and meticulous, you should be able to make it happen.

 

[daniel3877]

I think for a beginner he may be getting in over his head..but with that said..you will need to know how to use a flywheel puller, need to know how to use a torque wrench(20pds on the head) use the right size screw tips or you'll strip the heads of all your screws!!!.( from my experience of messing stuff up of coarse,,haha)you will need to order a new engine gasket kit and know how to reinstall everything back together again and what goes where.. kinda takes a little experience and patience. im actualy just finishing up my rebuild as we speek and i just ordered a new cometic gasket kit from ebay for 14 bucks..if you need a link let me know, youll def be needing one if your gonna do this

 

[xjma]

Got any friends who work on motors?? If you live in MA I'll do it for you for a couple of cases of beer!! The more beer, the faster it gets done!