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the rule of thumb is 1% pump efficency is worth about 10% hp in jetboat racing. every time you get your pump closer to the ultimate setup you get good gains. Most people over prop there skis but the engine wants to rev. This will kill the snap of your ski more than anything

To be fair the 62t does not require a girdle head and its a simple case of just screwing in the helicoils to the exhaust mounting bolts you dont even need to tap them they just screw right in there. I would say its cheaper to get a 62t cylinder to run than reliably than it is a 61x 90.5°...

And now 760 carbs just jumped up again in value. Thank you very much not I always use these things they are an awesome upgrade

Now your onto it

You seem convinced to go with a 61x so go with that. Your in for a shock however when you see the stock porting. So while it may be cheap your going to have to factor in porting. Oh also a girdle head because the 61x cylinder will break easily if you start to make power. When you have run it...

You don't need to deck the 62t cylinder. You can deck the 760 if you want to lower the exhaust port height. Im not saying anymore as it's going to push the 62t cylinder price up

If you read the blaster triple thread I did on pwctoday it goes into the angles in great depth and will explain it better than I can be bothered right now lol

The 760 cylinder will go hard. No doubt about that. But if you want the pop the 701 cylinder has the lower exhaust timing that will help you out. It's a lot to do with the way the transfers are aimed into the cylinder as well. Not the physical height but the angle upwards they are aimed as well...

If your using a 62t cylinder make sure it started as a 701 Don't get the 760 64x cylinder. It will go hard A well set up set of 44s will be better every where than a set of 38s If you are using me fuel its because you are burning more. If you are burning more and they are tuned right it's...

Sorry did i bump it to often hahaha

No one ??

I don't cut any off the bottom. The 62t has a lower exhaust port http://www.pwctoday.com/showthread.php?t=418776 If you have a look through this thread you will see all I have done to a 1100 a three cylinder 62t I wouldn't go as high in the exhaust as I have an extra cylinder here to give me...

Its awesome, the only thing better than a 64x cylinder is a 62t cylinder. I avoid running 61x cylinders on my own builds because it so much work to get them to run as hard as a 62t. The 62t has a lower exhaust port than the 64x and so does not have the same amout of blowdown. This limits its top...

actually it does change blowdown, I understand that the distance does not change between the two ports but the crank pin is in a different postion. The piston speed is not linear and it is faster or slower depending on the crankshaft postion. This changes blowdown

Where did you get the graphics from

you dont need a custom shaft if you use the ada plates it just bolts in there

yup sorry mate its all dried up now. I used to do really well out of it as well. But good luck finding any deals these days. There is a couple of models I still buy but im not letting that out. Even they are hard to come buy as well

I have one of these with a ported 1200 in it. It really is the most fun ski I have ridden.

Yeah I will don't worry this is just the dummy fit at the moment

It was time to give my fx1 some love. It's been sitting there while I was building my blaster. So here is the 133 pump in the ski. Well almost in the ski. I need to modify the rear nozzle so I can fit adjustable nozzles.