I bought a 2006 gz250

[tndoug99]

I bought a 2006 gz250 w/5300 miles, with a broken valve for $100. The top end was laying in pieces in a box. I believe I have all the parts, but wont know until I start putting it back together. The valve had broken and was stuck to the inside of the head about a 1/4" deep. I pulled it out and it left a small hole right beside the valve seat. I believe I can put a little JB weld to fill the hole since it is small and not too deep. I will post a pic later showing the damage to get some advice on repairing the head. I've already downloaded the manuals to get started.

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[BillInGA]

Welcome to the forum.

I'd say you got a pretty good deal, assuming the lunched valve was the only problem with it. Instead of JB Weld, you may want to consider a new cylinder head. You can pick up a new cylinder head assembly from CheapCycleParts.com for less than $500.

BTW, which valve was that broke?

[blaine]

Welcome to the forum.IMO J.B weld will not hold up under the high heat & pressures of the cylinder head.Will crumble & fall out and get into rings & bearings,waisting whats left of a low mileage engine,not to mention all your hard work and time.Maybe a machine shop can aluminum weld it as long as it's not in the combustion chamber.
http://www.postimage.org/templates/images/smiley/signs-and-flags/26.gif (http://www.postimage.org/)
:yes:

[Water Warrior 2]

Assuming there is only damage to the head I would be tempted to just get another head and assorted parts to reassemble the engine.

[mole2]

Welcome aboard. I agree with the others. If the JB weld works free you'll wipe out the engine. Get a new head.


:)

[tndoug99]

Here is a pic of the head. The hole is visible beside the exhaust port. I have ruled JB weld out. I don't want to spend a lot of money on the bike because I am not planning to keep it.

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[blaine]

If you don't want to spend the money to buy a new or good used head maybe you should consider selling it "as is" or parting it out.Either way it's worth more than you paid for it; if that's what you are intrested in.I would gladly buy it if I lived much closer.They are pretty rare around here.

:drool: O_o

[Easy Rider]

Either way it's worth more than you paid for it.......

Quite a bit more, I would think.

As for the head, that looks more like a dent than a hole. If that's the case, you might get by with just leaving it as is.
BUT.....
If the valve fell into the chamber and then the piston pounded the stem against the head to make that mark........I'd be more worried about the piston than that dent. Could have damaged the bearings, bent the rod or the crank too (not likely but possible).

[blaine]

As for the head, that looks more like a dent than a hole. If that's the case, you might get by with just leaving it as is..

To me that dent looks to be very close to the valve seat.If left "as is" I would be afraid of valves burning in a very short time.

:cry: :skull:

[Easy Rider]

To me that dent looks to be very close to the valve seat.If left "as is" I would be afraid of valves burning in a very short time.


Good point.

[tndoug99]

Here are a couple more pics. After easyrider mentioned the piston, I took a closer look and you can see where the valve hit the piston. There was no damage where the imprint of the valve is ... but in the upper right side, right by the vavle impression is a small nick that is raised up a bit. Not too serious I believe, but let me know what you guys think. I also included a closer pic of the head. It is very close to where the valve seats, but just missed it. Sorry for the quality of the pics...phone pics. If you need more detail, I could get my canon out. I appreciate the advice from you guys. Thanks!
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[music man]

Here are a couple more pics. After easyrider mentioned the piston, I took a closer look and you can see where the valve hit the piston. There was no damage where the imprint of the valve is ... but in the upper right side, right by the vavle impression is a small nick that is raised up a bit. Not too serious I believe, but let me know what you guys think. I also included a closer pic of the head. It is very close to where the valve seats, but just missed it. Sorry for the quality of the pics...phone pics. If you need more detail, I could get my canon out. I appreciate the advice from you guys. Thanks!


The problem isn't going to be the dent it knocked in the top of the piston, the problem is what kind of damage did it do to the lower half of your engine when that valve brought the piston to a screeching halt when it drove it into the head. So before I would buy anything for it, I would be wanting to know what kind of shape the bottom half of the engine looked like, like Easy Rider said, the crank, the piston rod, and the bearings all probably took a severe blow when that piston stopped like that.

And you are still going to have to do something about that dent it knocked in the head too, I don't think your valve is ever going to seal like that.

[tndoug99]

Probably the easiest thing to do is put it on craigslist "as is" and be done with it. What is a "fair" price for this "as is"? $400-500?

My last bike was a yamaha ES1100, but I could not pass this up.... I mean really...$100! I just wanted to sell it "as is", or fix it if I thought it wasn't going to be too much. But I don't want to half-ass fix it.
It sounds like it will be more expense than I want, so I will probably sell it "as is" and let someone who wants it fix it right.

[blaine]

Probably the easiest thing to do is put it on craigslist "as is" and be done with it. What is a "fair" price for this "as is"? $400-500?

My last bike was a yamaha ES1100, but I could not pass this up.... I mean really...$100! I just wanted to sell it "as is", or fix it if I thought it wasn't going to be too much. But I don't want to half-ass fix it.
It sounds like it will be more expense than I want, so I will probably sell it "as is" and let someone who wants it fix it right.

IMO $500.00 Is a fair price.I would pay it in a heart beat.It's worth more than that if it was parted out.I think your decision to sell it rather than half-ass fix it is a very wise move.You still make a few dollars and no headaches.Good luck.
:rawk: :)

[Easy Rider]

I think your decision to sell it rather than half-ass fix it is a very wise move.

:plus1:

[tndoug99]

Thanks for all the good advice. I will tell whoever buys this bike about this forum and all the helpful people here. Keep up the great work guys and gals.

:2tup: