Suzuki 2 Strokes

I know these are heavy steel but i wonder how well they are made as the ad doesnt show you much but they are a great price ? http://www.ebay.com/itm/191421287775?_t ... EBIDX%3AIT" onclick="window.open(this.href);return false;

I'm pretty sure that's what JEMCO and others use - but maybe with a different core diameter.

I suppose ideally we would need a 1" core instead of the 1 1/4" ?