Is this cylinder still ok to use for a little while longer on this yz 250

Toby_Blevins
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Toby_Blevins
Edited Date/Time 10/18/2019 11:57am
Is this still ok to use ??? Cant feal the scratches at all










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Paul_Pitzonka
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Paul_Pitzonka 10/15/2019 4:09pm
10/15/2019 4:09pm Edited Date/Time 10/15/2019 4:10pm
No.... those scratches are too deep, and it looks like there’s some plating damage as well below the exhaust port...
Toby_Blevins
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Toby_Blevins 10/15/2019 6:44pm
10/15/2019 6:44pm
Paul_Pitzonka wrote:
No.... those scratches are too deep, and it looks like there’s some plating damage as well below the exhaust port...
My finger nail dont catch its smooth. But I mean it is used.
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Paul_Pitzonka 10/15/2019 7:00pm
10/15/2019 7:00pm Edited Date/Time 10/15/2019 7:04pm
Im still going to say no, but you can De-glaze it see how it looks... this is more of an issue than the scratches...

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Toby_Blevins
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Toby_Blevins 10/15/2019 10:32pm
10/15/2019 10:32pm Edited Date/Time 10/16/2019 5:47pm
Who dose replating for cheep but is reliable.. I only ran 2 pistons through this head..my ktm was did by Millennium Tech and I've ran quite a few through it I'm not sure but I haven't changed it in like 4 years and it still looks better than this one.. but Millennium Tech is way too expensive
kb228
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kb228 10/16/2019 3:51am
10/16/2019 3:51am
Millennium tech and powerseal USA. Millennium charges $300 and powerseal charges $200. Both equal quality.
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Toby_Blevins
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Toby_Blevins 10/16/2019 3:55pm
10/16/2019 3:55pm Edited Date/Time 10/16/2019 3:56pm
kb228 wrote:
Millennium tech and powerseal USA. Millennium charges $300 and powerseal charges $200. Both equal quality.
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it before I need to send it off if not longer..
kb228
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kb228 10/16/2019 5:34pm
10/16/2019 5:34pm
kb228 wrote:
Millennium tech and powerseal USA. Millennium charges $300 and powerseal charges $200. Both equal quality.
Toby_Blevins wrote:
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it...
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it before I need to send it off if not longer..
Id find another shop because theyre wrong. I dont think anyone is going to say run it with that gouge paul highlighted. I certainly wouldnt be running it. Did you even measure the bore to check if its in spec? If not youll get piston slap and blow it up.
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Toby_Blevins
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Toby_Blevins 10/16/2019 5:46pm
10/16/2019 5:46pm
kb228 wrote:
Millennium tech and powerseal USA. Millennium charges $300 and powerseal charges $200. Both equal quality.
Toby_Blevins wrote:
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it...
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it before I need to send it off if not longer..
kb228 wrote:
Id find another shop because theyre wrong. I dont think anyone is going to say run it with that gouge paul highlighted. I certainly wouldnt be...
Id find another shop because theyre wrong. I dont think anyone is going to say run it with that gouge paul highlighted. I certainly wouldnt be running it. Did you even measure the bore to check if its in spec? If not youll get piston slap and blow it up.
A gouge is a little bit of an exaggeration it's pretty smooth to be honest but ima probably send it off with my other cylinder so I won't need to worry about it for a long long time
Paul_Pitzonka
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Paul_Pitzonka 10/16/2019 6:01pm
10/16/2019 6:01pm
kb228 wrote:
Millennium tech and powerseal USA. Millennium charges $300 and powerseal charges $200. Both equal quality.
Toby_Blevins wrote:
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it...
Hell I took it to my local shop that works on bikes they said I can get a nother 40 or 50 hrs out of it before I need to send it off if not longer..
kb228 wrote:
Id find another shop because theyre wrong. I dont think anyone is going to say run it with that gouge paul highlighted. I certainly wouldnt be...
Id find another shop because theyre wrong. I dont think anyone is going to say run it with that gouge paul highlighted. I certainly wouldnt be running it. Did you even measure the bore to check if its in spec? If not youll get piston slap and blow it up.
I agree... Find a different shop. Plain and simple that cylinder is hurt... my highlighted area may also be melted piston (Although I doubt it)... If it is it can be removed with some muriatic acid... If the shop didn’t even bother to run a hone through it to deglaze it, and take a measurement with either a bore gauge, or a snap gauge and outside mic then their opinion doesn’t hold much weight... There’s a difference between running and running correctly... The whole 40-50hr thing is nonsense you can’t measure a bore in hrs... it’s fairly black and white... either the bore is within service limit, or it’s not...
KX500
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KX500 10/17/2019 6:09am
10/17/2019 6:09am
Another option is to replace the cylinder. You don't mention the model year, but is this the same cylinder that is used on about a dozen model year YZ250s? If so, a good used cylinder may not be too hard to find and you may spend less than having current cylinder reworked. Not to mention, if you have a way to sell current cylinder, you might be surprised how little you spend going this route.

Yes, if you are looking to put this engine back together, race at the highest level and have it last as long as possible, then sure, you need to start with as 'new' as possible.

But, if you are not wringing that YZ out and riding a lot, the used cylinder route may be a good bet.

I've have gone the used cylinder route a few times, with no regrets - but again neither my skill level nor riding frequency would fall into the 'high' category.
Toby_Blevins
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Toby_Blevins 10/17/2019 8:08am
10/17/2019 8:08am
KX500 wrote:
Another option is to replace the cylinder. You don't mention the model year, but is this the same cylinder that is used on about a dozen...
Another option is to replace the cylinder. You don't mention the model year, but is this the same cylinder that is used on about a dozen model year YZ250s? If so, a good used cylinder may not be too hard to find and you may spend less than having current cylinder reworked. Not to mention, if you have a way to sell current cylinder, you might be surprised how little you spend going this route.

Yes, if you are looking to put this engine back together, race at the highest level and have it last as long as possible, then sure, you need to start with as 'new' as possible.

But, if you are not wringing that YZ out and riding a lot, the used cylinder route may be a good bet.

I've have gone the used cylinder route a few times, with no regrets - but again neither my skill level nor riding frequency would fall into the 'high' category.
I dont race.. it's a 2001 very hard to find parts.. I just picked this up for 400 .. I'm still debating on taking it apart and sending crank off to be balanced or just using it for a while


KX500
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KX500 10/17/2019 9:09am
10/17/2019 9:09am
How sure are you that the later MY cylinders don't work on an '01? The reason I ask is that some sources I've seen say that '02 to current cylinders work for '99-'01 as well, in spite of part number changes. I have no doubt the P/N changed for the newer cylinders, but was the change significant enough that a newer cylinder can't be used?

When you look at YZ250 pistons for example, it says '99 to current'.

I'm just asking - I don't know. And if you have researched this thoroughly, please disregard.
Paul_Pitzonka
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Paul_Pitzonka 10/17/2019 9:35am
10/17/2019 9:35am
KX500 wrote:
How sure are you that the later MY cylinders don't work on an '01? The reason I ask is that some sources I've seen say that...
How sure are you that the later MY cylinders don't work on an '01? The reason I ask is that some sources I've seen say that '02 to current cylinders work for '99-'01 as well, in spite of part number changes. I have no doubt the P/N changed for the newer cylinders, but was the change significant enough that a newer cylinder can't be used?

When you look at YZ250 pistons for example, it says '99 to current'.

I'm just asking - I don't know. And if you have researched this thoroughly, please disregard.
If I remember correctly the newer cylinders and heads will swap over... they made changes in both port timing, and compression ratio... the cases and crank do not they use a different crank half and main bearing... OP if you’re not a pro who’s wfo all the time don’t worry about balancing a 2 stroke crank I would just have it rebuilt and trued...
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kb228
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kb228 10/17/2019 9:44am
10/17/2019 9:44am
Also engine parts from the 2001 are still easy to find. I believe the stuff thats different is in the bottom end.

Getting a crank rebuilt is $190 from ken oconnor. Dunno why you wouldnt do that.
Toby_Blevins
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Toby_Blevins 10/17/2019 2:14pm
10/17/2019 2:14pm
KX500 wrote:
How sure are you that the later MY cylinders don't work on an '01? The reason I ask is that some sources I've seen say that...
How sure are you that the later MY cylinders don't work on an '01? The reason I ask is that some sources I've seen say that '02 to current cylinders work for '99-'01 as well, in spite of part number changes. I have no doubt the P/N changed for the newer cylinders, but was the change significant enough that a newer cylinder can't be used?

When you look at YZ250 pistons for example, it says '99 to current'.

I'm just asking - I don't know. And if you have researched this thoroughly, please disregard.
I'm not sure tbh..
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Toby_Blevins 10/17/2019 2:18pm
10/17/2019 2:18pm
kb228 wrote:
Also engine parts from the 2001 are still easy to find. I believe the stuff thats different is in the bottom end. Getting a crank rebuilt...
Also engine parts from the 2001 are still easy to find. I believe the stuff thats different is in the bottom end.

Getting a crank rebuilt is $190 from ken oconnor. Dunno why you wouldnt do that.
Now that is not true..took forever to find a case one company had 1 new and was 1000 I'm good on that.. somethings are easy to find yes... but other things not so much and parts are 3 times more $$$ then other bikes. New parts are almost impossible to find.. I was only able to find a high gear ratio for my transmission but they did have single gears
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Toby_Blevins 10/17/2019 2:19pm
10/17/2019 2:19pm
kb228 wrote:
Also engine parts from the 2001 are still easy to find. I believe the stuff thats different is in the bottom end. Getting a crank rebuilt...
Also engine parts from the 2001 are still easy to find. I believe the stuff thats different is in the bottom end.

Getting a crank rebuilt is $190 from ken oconnor. Dunno why you wouldnt do that.
And I'm going to get my crank in my old case rebuild this winter and put it in next time my put a piston in but this case hase a good crank so I'm leaving it alone for now

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Paul_Pitzonka
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Paul_Pitzonka 10/17/2019 3:38pm
10/17/2019 3:38pm
Riding on a used crank Off of eBay That you have no way of knowing the true history of would scare the hell out of me...
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Toby_Blevins
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Toby_Blevins 10/17/2019 3:59pm
10/17/2019 3:59pm
Paul_Pitzonka wrote:
Riding on a used crank Off of eBay That you have no way of knowing the true history of would scare the hell out of me...
It has no play in it at all.. I'm sure it will be ok till I rebuild top end in April
kb228
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kb228 10/18/2019 5:40am
10/18/2019 5:40am
Why are you buying an entire bottom end?
Toby_Blevins
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Toby_Blevins 10/18/2019 11:26am
10/18/2019 11:26am Edited Date/Time 10/18/2019 11:57am
kb228 wrote:
Why are you buying an entire bottom end?
Because left side case is busted behind stator where bearings seat.. and it's not a good ideal to just buy the left side case and not the right they are all a little different it can cause problems.its always best to buy both sides..
Toby_Blevins
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Toby_Blevins 10/19/2019 8:14pm
10/19/2019 8:14pm
This is the new case.. I'm sending crank off in 5 or 6 weeks has a pro series crank in it never hurd of that. Sending cylinder off with piston when I receive it. Had some Mark's that looked like cracks but they sanded away
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Chance1216 10/19/2019 10:37pm
10/19/2019 10:37pm
Why sand it if your sending it out? Actually, why would it be ok to sand it?
Toby_Blevins
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Toby_Blevins 10/19/2019 11:08pm
10/19/2019 11:08pm
Chance1216 wrote:
Why sand it if your sending it out? Actually, why would it be ok to sand it?
I'm not talkin about sanding the cylinder the new case had a couple of Mark's that look like cracks so I sanded those down to make sure they were not cracks not the cylinder
Blackjack31
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Blackjack31 10/22/2019 11:30am
10/22/2019 11:30am
Everybody says send it off, which is what I would do if I was racing it. It just depends on what you are doing. If you are trail riding and goofing off, then run it. The bike will run with that cylinder. If you are racing it then no I wouldn’t because it could be dangerous. You don’t wanna be going off the face of a jump and the motor bog down and lock up. If you decide to use the cylinder just know you are taking a chance of causing more issues. There’s gonna be a lot of play in that piston to cylinder clearance. When it blows up it’s gonna more then likely mess the cylinder up more, trash the crank, and you will probably have to have your head resurfaced. Can you run that cylinder for a few more hours? Yes. Would I do it? No. And actually my friend had a cylinder shipped to millennium and they couldn’t fix it. he had to pay shipping there and he had to pay shipping back after they said there shop couldn’t fix it. Then he had to buy a new cylinder. So, you are taking a huge financial and physical risk, depending on your intentions for the bike, when you run that cylinder.

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