OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers Pondering a reco

G'day Norm,

For sure. Irving does point out that the 'plane' in which the vibration occurs is important.

And compare these to the 'Victa 500 Twin', which had by far the best inherent balance of any engine Victa used.
Especially since it was a 'boxer twingle', with both barrels firing at the same time.

Edit: Anyway Misstonz, apologies for our meanderings down a technical sidetrack here.

The upshot is, that a modern 'sloper Briggs' will be much kinder to your SB45 chassis than an older 'vertical cylinder' model.

Hi Mystyler,
The only way you could rubber mount the motor would be when you were doing a rail replacement because you have to lower the rail by the thickness of the insertion rubber. The only reason I mentioned it here is that the OP has to replace the rails and still wants to use the original motor so this would certainly help the situation

So in the end, there is the "Jones Gusset repair method" that's been well discussed on this forum or alternatively send the bare chassis to Shane in WA to completely replace the rails with 3mm thick copies that will last the life of the machine and thus still look perfectly original. Shane does a superb job in this field and never seems to be short of incoming work.

The reason why these new generation Briggs engines are so popular is that they are so much kinder on the original twin railers or ones that have only been zapped up with a mig without any reinforcement done underneath and that speaks volumes here in end costing of a machine being rebuilt in this current Model 45 climate.

Just a word on "Thumpers"..................the reason why bowling clubs etc. used electric mowers opposed to petrol powered units is for the same reason that these rails are failing and that's from the thumping effect that these mowers would have on the greens surface and is the same effect that the rails are being subjected to.

A bowling surface needs to be like a Snooker table and not like a corrugated country dirt road which is what a single piston petrol engine mower would inflict upon the surface, as such electric motors don't create this issue and are the preferred method.

Regardless of all of the above the current Briggs Slopers are being sold at a very affordable price, are much smoother running and seem to be very reliable as well, thus they have become the new benchmark for our much loved 45's.

Cheers,
BB.


Below is a good example of the "Jones Gusset repair" method employed.

Well it looks the sale wont go ahead and the frame will go to the gods whilst the motor may get another life elsewhere. Thx for the help guys

He wouldn't pay you enough to take it off his hands?

So this was all worth it wasn't it ?

Sounds like another wasted machine heading to hell !

BTW where was there ever a sale mentioned in this thread ?

Yes it was, in the OP.
Pity about another SB45 being headed to the scrappies, though.

Thant's a shame Misstonz, but good luck in the hunt if you intend to do one up.

Thanks guys - yeah i was looking to make an offer on the machine. given what we have found out about the machine, the mate who owns it is looking to remove the motor for a go cart or similar and not sure about the rest.
If i can get the frame for nix it might be worth looking at.

If you can get the frame for nix you are in a good starting position, because the motor was a stumbling block and the cause of the major damage.

A free frame is a free frame...maybe chuck a ten or a twenty his way for everything sans motor if you want to try to seal the deal.