Yeah you need the rubber adapter. As far as the mikuni goes it could be a bit hit and miss as that is the carb I'm running sorry was running on an 88, it's actually a 22mm carb as it is an oval bore. My dhz 140 when I bought it new had a 30mm Chinese mikuni on it and it ran pretty well. The carb from that site could have random jets in it i reckon so in my opinion I'd still be saving and getting the 24mm oko. You can get them of eBay for about 68 bucks and jets from the same seller.
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