447 or 533

So i have to buy a new cylinder. But im wondering if its a 447 or a 533.
On the engine block it says 447 but on the rod 533. Hmm

dwayne

Likely 533 in europe? Biggest difference is the rod length right? Cylinder the same, but pistons must match the rod length.
From a post on here;
Yamaha early -256 135mm length rod to stroke ratio of 1.824-1

Yamaha -447 130mm length rod to stroke ratio of 1.756-1

Yamaha -533 Europe 140mm length rod to stroke ratio of 1.89-1

gggGary said:

Likely 533 in europe? Biggest difference is the rod length right? Cylinder the same, but pistons must match the rod length.
From a post on here;
Yamaha early -256 135mm length rod to stroke ratio of 1.824-1

Yamaha -447 130mm length rod to stroke ratio of 1.756-1

Yamaha -533 Europe 140mm length rod to stroke ratio of 1.89-1

Click to expand...

ok so the number on the engine block doesnt matter. Its the number on the rod? Ill order a 533 then?
D

Well I'd prolly measure before spending money ;^)

I have seen a lot of 447 -s for sale in Germany engines and conrods on e -bay
I believe both types were sold .
I don't know this for a fact but I have the impression there are more of the 447 rods
engines.
If you are buying used be aware that there are over sizes.
Can be in your engine and the cylinder you buy can be bored
Or yours can perhaps be re bored + new pistons
If you have shop connections.
I believe the pistons has marking on top so be careful so parts match
A machining for oversize can get expensive
There are kits available as
.https://www.xs650shop.de/en/cylinde...der-kit-at-650cm3-oem-cylinder?number=05-0640

If you compare part numbers you can see what parts are interchangeable

.

gggGary said:

Likely 533 in europe? Biggest difference is the rod length right? Cylinder the same, but pistons must match the rod length.

Click to expand...

That's what I'm thinkin'.... same jugs on both. Here... let's ask the expert....
@650Skull @650Skull

Yes, I'm thinking the same thing - same cylinders just different rods and pistons.

I cant help much here, other to say the European models had a 447 engine prefix from 75-79. The 75 was defiantly a 553 engine with 553 con-rods. Did they change the con-rods on European models between 75 and 79 to 447. Don't know..............If the con-rods in your engine have 553 stamped on them it would be safe to assume they would be replaced with 553 con-rods.

France had there own models, They had an 1H1 engine prefix. I do not know if these models had a 447 or 553 con-rod...........looks like some research is on the books

The question is are the cylinders the same 'tween the 447 and 533 engines?

gggGary addressed that in post #2.

From what i understand cylinders are the same. Its the length of the con-rod, and where the gudgeon pin is situated on the piston to match the extra length of the con-rod

On Heiden Tuning site they have a PDF with this information in it.
From PDF

Use the Model code from the chart and cross reference with the ID chart, (in purple),. All European Model codes on the chart are 553 engines, corresponds with all European model codes on the ID chart, (in purple), from 75 till 82.

Model 2Y8 is not on the ID chart. Never heard of his model.....???.......on reflection it may be the Standard model sold in europe in 80/81..........bit more research to do

650Skull said:

gggGary addressed that in post #2.
Model 2Y8 is not on the ID chart. Never heard of his model.....???.......on reflection it may be the Standard model sold in europe in 80/81..........bit more research to do

Click to expand...

According to the Yamaha Model Index 1958 - 2008, 2Y8 is a 1979 V80

So i guess mine is an IU3 with a connecting rod 533?

You did say your connecting rod has 553 stamped on it?

650Skull said:

You did say your connecting rod has 553 stamped on it?

Click to expand...

Yes but i do not trust the owner prior to me . I need the xs650s gods approval.

Doesn't make any difference unless the pistons and rod are mismatched. 447 pistons and 447 rod....553 rod and 553 pistons.

I assume you didn't take the engine apart.

Gong from the information i posted, (and that was on Heiden Tunings site), and the ID chart against your vin # your bike is a 77D Euro. Only you can identify the pistons and rods to confirm. The pic showing the different pistons is easy to compare with your pistons. The wrist pin hole is the tell

dwaynemcfarlane said:

So i guess mine is an IU3 with a connecting rod 533?

Click to expand...

Again a bit caution is recommended the casings can in worst case be replaced
the 533 No on the Con rod I would regard as a fact if the bike ran with that
To much work to fake that.
And I know that not even in the same year model ( I Have had 2 the same )
the same pistons are used from Factory
The radial play is matched pistons to cylinder if I recall right in three classes
Pistons has a marking on top ( Crown ) and cylinder at bottom
So at the factory at manufacturing the right pistons were matched with the right Cylinders
getting the right radial play.( We are talking quality aspirations here ) ( Might not be a big scandal if the same bore size but might as well mention it if a perfect job is what one wants )
New that is --- the pistons can wear out and the cylinder can have the factory markings left but be bored 4 times
If you put your stock nominal worn pistons in a 4 over cylinder you don't have a smile on your face upon first start
Or perhaps worse a oversize piston in a brand new cylinder .. first size or so .Some combinations is of course not possible to build and you notice it

There can happen all sorts of things
The 447 and 553 pistons also are different so doing a Rebuild in this region needs some thinking

One needs to measure ore go after the pistons markings and ring markings
One can push in the pistons known stamping s and right rings measure the gap with a feeler gauge

Above is maybe wrong to some extent .. but as a start for read up on complexity.
Replacing cylinder --- perhaps the rest is OK no need to worry about Conrods .???
New cylinder and perhaps new rings can be one way forward.
Depending on problem with cylinder.
If it is stock factory setup on your bike standard size there can be problems finding parts Piston and Cylinder.
Especially if you are looking for the exact right one of the three classes from factory.

Not done it myself but read about it that the shop gets the pistons and the cylinder and the play one wants
And bore to the right spec. Rather expensive where I live.

Yeaah you get it if you have 2 d oversize 533 in your bike fine pistons you want to use
If you then buy an 4 th oversize Cylinder ( With factory size stamping left gets fooled by that ) on e -bay cant use it cant do it smaller
$ 100 down the drain.
I took my cylinder to a shop and got it measured approved and honed It was a bit worn but got OK ..It is to much job not to do it reasonably well
once in there in my opinion

Cruzinimage sell 553 pistons from standard size, (75mm), +.5mm and 1mm and 3mm, (706cc Big bore), pistons, clips, pins, rings and the price is half you pay anywhere else. Good quality as well going buy what has been used on this site with reports/feedback
https://www.cruzinimage.net/page/3/?s=xs650

Hoos racing sells 533 710cc pistons, JE pistons excellent quality.
If it says 533 on the rod that's what they are