Yamaha Breeze 125 - torque specs/manual? By ducked (Read 6,796 times)

[ducked]

Stupidly I took advantage of my girlfriends abscence to "fix" her scooter, (a Yamaha Breeze 125) which has had a bad oil leak for a while.

Even more stupidly I initially assumed it had a "conventional " valve cover, and loosened what I should have realised were head stud nuts.

I've fixed an oil leak from one of the circular valve adjusting ports, but its now leaking from the cylinder base. I don't know if it always did that, or its started because I didn't torque the head nuts enough.

I'd "guessed" at 20 ft -lbs

I'll try torquing to spec if I can find out what they are, but it'll probably need a rebuild.

I really need a manual. Anyone know where I might get one? For example, are any of the models linked to on this site likely to have the same engine?

The cylinder head/valve cover has what looks like "Y7-1" and "18800" cast into it. The side of the cylinder barrel has "YAMAHA 4CWO3 124cm3" cast into it.

(Thunbnails link to full-size images)

[JR]

Scooter?

www.tradebit.com/filedetail.php/197457682-yamaha-breeze-125-atv-service-repair-pdf

[ducked]

Yes.

Scooter.

Yamaha use the name Breeze for various things. Here in Taiwan its a 125cc scooter, as I said, and the naked /unfaired version of a 150cc V-twin motorcycle. Probably other things as well. They just seem to like that name.

Apparently in the US its a 125cc ATV, but that'll still be useful if its got the same engine. If I can get it to download I'll have a look. Thanks for the link.

- Ah. Just realised its a pay-to-download. Not expensive at $11.95, but for now I'd have to be a bit more confident it was the right stuff before paying for it.

Thanks anyway.

[Alleyoop]

www.4shared.com/web/preview/doc/krw3AMx1

[JR]

Alley that's the same thing, got to pay. I have the ATV Breeze owner and service manual and I could put it here but they are useless as far as what he needs to know. Even though they have good info on taking care of the engine, etc. there are no torque specs at all.

Yamaha is funny, they make owner, service and then the workshop/repair manuals which are for their techs which do give all specs including torque values.

Also I did some reading and found out that the Breeze has ben rebranded to the Raptor YFM125 and they make this model all the way up to 700cc. The engine on the Raptor is a identical 125cc to the Breeze.

So if we can find a Raptor 125 workshop/repair manual we'll be cooking!

JR

[ducked]

Thanks. That could be useful info.

I found a Raptor 125 service manual available for apparently free download on a few sites, but they wanted me to download a "downloader" .exe file. Don't fancy that, somehow.

Went to a Yamaha main dealer with the gf (yes, I am in trouble) and was told 220 ft-lb. (!)

Pretty sure that's bs/lost in translation.

They also said they didn't have a manual and just did it by memory. Probably true, though not exactly confidence-inspiring. They might just have been avoiding letting us copy thiers. They used to have a manual for my RZR motorcycle but I never copied it and its probably too late now, though I might be able to get one in Thailand.

I went through the figures in the Yamaha manuals you have links to on this site, and stuck them in a spreadsheet. They don't format well as text, but range from 10Nm for the Riva CA50 to 52Nm for the YP400T, though its unclear exactly what they're talking about in some cases.

The closest-looking engine (similar but not the same) is in the YP250 Majesty at 22Nm /16 ft lbs, so my guess of 20 ft-lbs, though it may not be correct, is at least reasonable.

This kind of hassle would be a good reason to get a "standard" GY6-engined scooter, rather than a do-its-own-thing Yamaha ("The Citroen of Scooters?").

I have to say, though, that I can't make much sense of the GY6 head torque figures given in the available "generic" manuals either, so perhaps its just me. 

Quantity Nm m-kg ft-lb

Jog CS50Z Cylinder head and cylinder nut 4 14 1.4

Jog CS50Z Cylinder stud 4 17 1.7

YP250 (Majesty) Cylinder head and cylinder nut 4 22 2.2

YP250 (Majesty) Cylinder head and cylinder bolt 2 10 1

Riva CA50 Cylinder head nut 4 10 1 7.2

Riva CA50 Cylinder stud bolt 4 8 0.8 5.8

XC180 Riva Cylinder head cover ? 1 (?) 20 2 14

XC180 Riva Cylinder head 4 22 2.2 16

XC200 Riva Cylinder head cover 20 2 14

XC200 Riva Cylinder head 22 2.2 16

XC200 Riva Cylinder head - cylinder 22 2.2 16

YP400T Cylinder head and cylinder bolt 2 10 1 7.2

YP400T Cylinder head and cylinder nut 2 40 4 29

YP400T Cylinder head and cylinder Cap nut 2 52 5.2 37

YP400T Cylinder head cover and cylinder head bolt 9 10 1 7.2

YP400T Cylinder head cover and camshaft cap bolt 1 10 1 7.2