help identify a pipe

[MrIgor]

I bought a ski with some extra parts. What pipe is this?

 

[MTRHEAD]

Coffmans dry superjet pipe.

 

[MrIgor]

I am new to yamaha. The story behind this machine which i just bought it has a 760 bored out to 790. It had the cuffman pipe installed with a b-pipe which he never installed. Rickter fs3.

Will i need to rejet the carbs? What settings should i preset the b-pipe too?

Are the chambers the same on 701 and 760?


Is it really worth swapping thr cuffman pipe to b-pipe?

 

[Big Kahuna]

Depends on what you want. the Coffmans will give you more mid to top end. the BPipe is just more reliable. Power will be better bottom to mid.

 

[MrIgor]

Would the jetting be the same?

Any suggestions to what screw settings should be on the b pipe with a 790

 

[MTRHEAD]

That was a race pipe. It weighs around 21lbs with water. B pipe is under 15.

If you don’t have a cylinder girdle and ecwi don’t bother even trying

 

[MrIgor]

Try what? I have the same setup on a octane.

I am not sure what is inside this motor yet. All i know it has some sort of aftermarket head, r&d intake manifold, aftermarket carbs

 

[MTRHEAD]

Post pic. I wouldn’t even bother with the Coffmans pipe if your not racing. the powerband of that style pipe is not linear and as others have said it lacks low to mid. That’s why 90% of every superjet that has a pipe has a B pipe and most that don’t would if they could find or afford one

 

[TheBuzzard]

lightening series dry pipe. this was one of the best pipes for creating power in old race boats. great pipe if you want to go fast and not jump your superjet, cause the bracket don't hold up.
i'd like to see whats under the hood of that octane also. I see the nozzles in the pic with the manifold.
post some pix of your whole assortment. everybody likes to look at pix and if you don't know what you got, I myself and a few others can take one look and let you know more about what you got than you and hours of research. lol

 

[MrIgor]

Sorry i think i got everyone confused.

The rickter came with 2 pipes. Coffman and b pipe. Orginally it was runing on the coffman pipe. I want to install the b pipe instead of the coffman pipe.

 

[MrIgor]

In my box of parts i have an extra steering nozzle with a blue ring inside and a ride plate. Anyone know what model they are?

 

[MTRHEAD]

The nozzle is solas stainless octane

 

[MrIgor]

Awesome. I have an octane as well. Should compare if its the stock one or not.

 

[TheBuzzard]

its stock and not much of assortment of parts to eyeball. lol
nice hacked down sn plate. sell it to an 08 and up guy as a freestyle plate.

 

[MrIgor]

Open to offers lol

you sure the venture and nozzle is from an octane? i would of guessed the rickter would be SJ

 

[MrIgor]

Case 62t. Top is 61x. Is it even possible to be 790cc

 

[mikidymac]

Not likely, even if you put bigger sleeves in a 61X you would still max out at about 780.

 

[MrIgor]

This is going to be fun. Any tips on adjusting the b-pipe

 

[john zigler]

This is going to be fun. Any tips on adjusting the b-pipe

Start with the top, and mid screws closed. Bottom screw at about 1/8 turn. Check pipe temps and tune from there.

 

[TheBuzzard]

Case 62t. Top is 61x. Is it even possible to be 790cc

I've got a couple old ADA girdled heads from old racers that were engraved 785cc. I think with a stroker crank and big bore is what they had to get 785. I don't know why somebody would engrave 790 on there if it wasn't. I know you can punch out a 61x to 84mm and I heard you can even go a hair bigger.
by the purple color of those press on bells, it looks like you got buckshot carbs. probably 46s.
the way the hood opening on the left is ground out to the hood seal , tells me it once had an R&D dry pipe on it. the preferred race pipe back in the day.
that looks like a rough rickter hull or is it a clone?