I would not use a twin start again, It doesn't need it, At high rev's it comes back to the tank too fast,
And on a standard "C" Twin it squirts oil out the breather hole in the filler cap,
I think the Twin start wears out quicker, And a lot are fitted wrongly.
You can fit a deflector just inside the Oil Tank.
To me just not worth the trouble, I did use them for a few years.