Dimo,

Your low throttle issues are not with the Engine but with that carb set up. The carbs are too far away from the Engine to be running right, you need to get ahold of Nitrosport and set up a Seadoo carb like his 670. Don't do any clutching or tuning as it will not help a Engine that is not running properly. One of my favorite sleds was a 583 MXZ, could put anyone on it from kids to my wife to myself and have a blast - get it running right and you forget the stock Pilot Engine in no time.

Ak

Didn't notice the huge intake boots . yup he needs a seadoo intake and it should help quite a bit!

I'm very interested in getting it running right. Anyone interested in helping me out with this? Im not that familiar with seadoo intakes and sled engines. Or is anyone interested in a trade for their pilot?

Dimo

I'm very interested in getting it running right. Anyone interested in helping me out with this? Im not that familiar with seadoo intakes and sled engines. Or is anyone interested in a trade for their pilot
Dimo

Unless you understand what is going on with that exhaust (which I honestly don't) you should start by photographing that expansion/muffler set up in detail and getting some opinions

I personally don't see anything really wrong with the exhaust that would hinder performance. It is ugly and there are many better ways to do it? Yes. But to me it looks like a stock 583 pipe that was shoehorned in there. If the side-bleed is what you are unsure of, that is very common. My summit x 670 pipe is a side bleed and is one of the better pipes for the 670 engines.

Hey guys, I'm very happy with it!! Just got back from a weekend at Glamis and It did everything once I put some paddles on it. I have a video and will load pics shortly. In my opinion it's still got way to much torque right off the line. Hopefully when I post some pics one of you guys can give me a suggestion on how to get a better takeoff. Compression is at 140 in the left cylinder and 132-135 in the right I'm hoping a good carb cleaning, spark plugs and cleaning the fuel filter/ lines will correct that (Yes I know that's unlikely and I will probably end up changing the top end or one cylinder).

Also yes that's the one from the pics, it has K&N filters on it and all the metal on the a-arms, exhaust and frame was re painted with combination of red and black. A much bigger radiator and fan that my brother and I threw on there from a 94 civic lx. I'm going to change the fuel tank to aluminum one from ebay as soon as I find a good deal on one and finish this last tank.