Winsun 192 anyone

[arnaud]

Who else has experience with these engines?

[Stuart]

I’ve no actually experience with them but as with the Punsen, they are Chinese knock offs I believe & it’s best to build a bike around an original Yanmar if one is available.
I’ve seen fuel lines crack due to not being supported on the copy engines & other things that compromises their longevity.
Sorry I can’t be more specific & can only give an overview.

[arnaud]

Thanks for reply.. i will try the failing 192 engine once more.
But i cannot find any info about the fuel delivery angle and at what torque the - removed and now checked- injector has to be fastened?
I cannot belive 7nM is enough?

There was RUST in the injector of the new engine, i discovered it recently...

[Stuart]

Ooo that’s not good!

[arnaud]

No, since an injector is closed at rest, i wonder how..
Anyway, the 10-12Nm fastening torque for the injector seems low? Because of the high compression of the engine?
Or is this (again) marely in my head?

[arnaud]

Does anyone have an exploded view of the engine?
The section where the fuel pump is, is different for the 188
There's a lid between the pump houding and the engine, and forgot if there's a copper gasket on booth sides (which influences the timing)

I cannot find one online?

[arnaud]

I found out another flaw; Why the flywheel spinned over the crankshafft despite tightening the big nut; The taper does not align with each other..
There's no source for spare parts for these engines?

[arnaud]

Engine is running again! With the help of valve-lapping paste, patience, loctite 648 and a electric spanner (What's it called in English?)
I de-aired the fuel line but, rpm, especially when half throttle, is fluctuating very much, idling is not possible..

Fuel flow is allright

Does anyone have a tip?

[arnaud]

I figure the smaller of the 2 governer springs have something to to with de stabile run at lower load/rpm's. I hailed 3 Yanmar-dealers for a set of springs (both springs have 2 numers at the drawing, that means there are 2 types of each?) but not one of them responded.