Re: WOW ! I thought I was on my own...
I'm looking at restricting a mininmoto engine down to 1kw for legal purposes. Big problem is the silly small sprocket sizes, as low as 6 teeth, which might be ok in racing in short bursts, but I want something that lasts longer and is kinder to chains. There's a 4:1 reduction box available as well, that has an 11 tooth output, which isn't perfect, but it's better than a 6 or 7.