Would CB250 piston rings fit a Xs250?, new question.

[Jamie S]

As above , I was going to put a 400 engine in the yam xs250 until I just found out that honda Cb250 piston rings are only £12, would they fit my yam Xs250?

[hmmmnz]

the xs 250 hs a bore and stroke of
78 55.0 x 52.4 mm
the cb250
72-76 56.0 x 50.6 mm . 77 - 86 62.0 x 41.4 mm
86 55.0 x 52.4 mm.
2000 53 x 53mm

the 86 model xs250 has the same bore and stroke as the from 86 cb250
in that case i can only assume they are the same.


ffs why am i searching through all this crap for you???
surely you know how to use Google as well as me!!
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[Blau Zedong]

[Jamie S]

blueX5, you clearly are wrong as hmmmnz just said it would.

[Jamie S]

[Blau Zedong]

It's got cock all to do with the bore and stroke. Do you not think piston rings have other dimensions to take into account, i.e. width, depth, ring gap etc? If it was swopping between two Honda's then it might be a possibility but I bet that the ring groove dimensions on the Yam are TOTALLY different.

Don't bust my balls, boy.
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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

[Pete.]

Bluex5 is quite right.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[ZRX61]

[NSR Mick]

If they had the same bore and ring thickness I'd give it a go.

Stroke is irrelevant.
____________________
If you dont like the way that I ride.......Stop trying to keep up!!!

[Jamie S]

Thanks Mick , I will see if I can get the shop to measure the thickness (think that's the right word) of one of the rings with vernier caliper's and then I will measure the ones that come out of the bike and fingers crossed see if they are the same. ( I so hope they are, itwould save loads of money )


FTAO: ZRX61, Go read in show and tell and have a look at my Ariel project you stupid yank.

[NSR Mick]

Jamie. Slightly rewording what I've said, you will have to measure the height and thickness of the rings if that makes sense.
____________________
If you dont like the way that I ride.......Stop trying to keep up!!!

[Jamie S]

From the arrow to arrow and from the red dot to a dot you can't see but would be directly underneath the red dot you can see. ?

IMAGE:

[Paddy Blake]

Jamie if you can track down both parts on one site and see if they have
the same part number then go for it other that I would leave it.

Paddy.

[MaybeGuy]

heres my interpretation of the scribble... for those who didnt get it :S im just guessing here.
https://aycu40.webshots.com/image/19319/2005294855401654834_rs.jpg
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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

[Paddy Blake]

[hmmmnz]

lol funny stuff
you can all but try jamie, i'd say you'd be very lucky if they did fit.
but you never know untill you have a measure.
its a bit of a problem... yamaha never made many twins so trying to find bits for the wee buggers is going to be a problem.
infact the xs250 was the only yamaha with a bore of 55 mm
the next closest has a bore of 56
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[iooi]

I would guess that even if both parts were exactly the same they would have diffrent part No's.... Lets face it he's looking at parts from 2 diffrent manufactures.
Often parts that will swop between bikes from the same manufacture will have diffrent part numbers.

The only way to tell would be to measure in all directions, and then if they are the same, compare bits side by side. Looking at stuff like the angles the rings have been cut at.
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Just because my bike was A DIVVY, does not mean i am......

[Pete.]

The depth of the groove isn't that critical so long as the XS has a similar or deeper groove than the CB. The thickness is critical and must be the same. The groove supports both sides of the ring so if the ring isn't a perfect fit it will bend and snap under use. Remember the piston changes direction a couple of hundred times a second and the ring will be dragging on the cylinder wall.

The other thing is that the rings might be of a completely different TYPE. The oil-control rings will probably be different and have different drillings in the piston and the cylinder liners might be of a different material needing a different type of ring too.

The odds on them fitting successfully or lasting any length of time are not good at all.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Rockhopper]

It might actually be easier to get a whole piston complete with its rings that'll fit.

[Jamie S]

Off what ? An Xs250 ? You find it and ill buy it , because I have searched and searched and they don't seem to exist.

[thegubner]

When people are trying to help you could be a bit more polite, it seems you are only listening for the answers you WANT rather than the truth. If you cant find a piston, then just keep looking,
I am sure you will find one somewhere pal.


If not, is it worth looking for an engine being broken for spares?

[ZRX61]

[Nath]

[ZRX61]

[Blau Zedong]

I don't believe you have actually rung a Yamaha dealer and asked. It's surprising what stuff is still available. Try Granby's for a start.
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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