Sorry for digging up this old thread,but i havent hit the water for a while,been busy, any way tried the boat today with same result boat just stops when you go for a touch of throttle, Im running the boat at 20% nitro 20% oil 450 octura prop and put a ops power pipe on as well.The tank isnt presureized and it seems to vibrate quite a bit,going to put a air nipple in tomorrow to see if theres any differennce also i think the plug is a no8 does that sound right, i was thinking when it gets a bit of pace [not much] the water going through motor mite be shutting it down.Sorry for all the ???? but the needle in excelerator sleeve is about 1mm out from the fuel needle will i need to adjust this in or out [is this where you get bottom end power] also this needle looks to be slightly bent [of track] when you adjust the needle in towards the fuel needle. The boat seems to have no down low power what so ever, come to think of it no top end power neither,[ NO MORE EBAY FOR ME] but im gunna get this thing goin some how, but i not think by my self thanks for any help i need it CHEERS DAVID B)