OutdoorKing Repair Forum Forums Finding and Swapping Tip & Curb Side Finds Mustang 80 Series.

Well I guess Bert it was and it was a complete different design of engine altogether.

Yeah the engine is a lot smaller. So I guess there was no need to cater for balance weights spinning around so the crank case got much smaller.

How did the overcome the lack of balance weights?

Did the use a weighted flywheel/cutting disc?

Mine still vibrates but the newer ones would be like an earthquake in comparison...

Well I guess they just used lighter metals and seeing as there wasn't to much un-balancing.You would find that when the piston is at TDC the weight on the crank is it it's furthest away point therefore keeping it more balanced,so there really wasn't too much unbalanced weight being thrown around.Then relied on the cutting disc,to take up what was left.My tilt-a-cut with it's power-torque engine has as balance weight under it to keep it in check.
I'm not a real fan of the power-torque but who ever deigned it did seem to do their homework on it.

Ok, I'm showing my ignorance but how does the crank bearings get lubricated if the oil is only in the fuel mix?

Or have I never changed the crank case oil in 30+ years...

No Bert that is a great question and if you'd never looked at it before and or told you'd never know.
The best way really to explain is via a scan of a document I have here.

Thanks, well that just answered a life long question!

Castrol GTX has been a good choice even tho I never realised the significance.