OEM 155 Pump Talk

[JT_Freeride]

What would be the ideal pitch for a 701. What's the 155 equivalent to a 9-15

 

[freestyle 650]

I've been running oem 155 pumps for awhile and am very happy with the performance. Last year I ran my gen 1 xs1000 with a oem 155 pump, 11/17 e75 prop, with a 90mm nozzle and a couch steering nozzle, they are bigger than the 144 steer nozzle. I plan to keep the oem 155 set up with my 1200 dasa, but i plan to set up to a 13/18 cut back 5mm and then fine tune nozzle bore, set back and prop pitch from there....the key to these pumps and any pump set up is really just knowing what your doing and taking the time to set it up and tune it properly

 

[Nuklear6]

I love the idea of the oem yamaha 155 pump and i believe it is a very good option. With a tbm pump stuffer to increase stator center diameter and the correct pitch prop for your engine and hull it can be awesome. For the hard core flat water guys the major disadvantage is there is no way to set the prop back enough. Mag pumps that are "setback" keep the prop a few inches further to the back of the pump tract. Thus when the intake grate leaves the water on a flip attempt the pump continues to make thrust longer as there is more water infront of the prop already. This can be replicated by making the intake tract of the hull longer but then the the intake grate will leave the water earlier. This isn't as important when flipping in the surf as the wave providers water for all of the take off. But our flat water friends need as much thrust as they can get.

 

[96superjet]

This is a 155 pump from a 98 XL1200 I had laying around. I drilled and tapped it for dual cooling today, but then realized the 4 long bolts that hold the pump sections together don't thread into wear ring like they do on a 144 pump.

So, what a cost effective way to rectify this? I'm thinking tap the front holes on the wear ring and thread in helicoils. That way it would be held together like a 144 pump.

I suspect they make threaded after market 155 wear rings, but that sounds expensive. Are there any OEM wear rings that are threaded that might be cheaper and easier to swap out?

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[Wizards Powersports]

Easiest option would be as you suggest..helicoil your existing wear ring. No Yamaha 155 pump with the mounting ears had a stock threaded wear ring to my knowledge, they all bolt through to the large pump inlet duct.

 

[96superjet]

As a secondary note, you can notice the reduction nozzle is only drilled and tapped on the top and bottom (to fit that odd metal gate mechanisms they put on couches).

I suspect it's reasonably easy to drill and tap the sides of the reduction nozzle to employ a trim ring?


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[yamanube]

This thread has me thinking, my intake tract is HUGE but it's just long and not wide (stock SJ width), do you guys suppose that would still be an effective way to feed one of these? Also would a ported 760 benifit over a 144? How much does a complete pump usually go for?

 

[Yami-Rider]

We just turned the stock bolts around backwards and installed SS 6mm nylon nuts (see attachment). The pump we did this too was a GP800 pump, which is a 144, but had no threads in the wear-ring like the 1200 pumps.

 

[96superjet]

A. Great diagram
B. Smart solution
C. Do the heads of the bolts come into contact with the pump shoe?

The only real space between there would be the thickness of the rubber pump ring.


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[Yami-Rider]

We didn't have to modify anything, there was a tiny bit of room to spare between the duct shoe and bolt heads. If the 1200 has the same flange/rubber seal setup as the 144, it should work.

 

[Christian_83]

@96superjet what i did, was bolting wearring with stator with 4pcs of 8x25mm A4 bolts, same wtih stator and reduction nozzle.
You guys gotta remeber that the OEM casted pump outlet, gotta be cut off - it will interfear with your steering cable

 

[Jet_jase]

Would a 155 be better than a solas mag in white water surf? I'm running a stock pump at the moment and the surf was pretty sloppy yesterday and my pump was cavitating more than normal.
I will be upgrading very soon so spotting this thread has made me think if this would be a better option.
Also im guessing a 155 will fit a FR2 Evo with a 155 wear ring?

 

[air blair]

A 155 pump sticks out the back further and also does your steering cable. A bit tricky to get your throw proper. Thrust sells pretty much a cable extended but its for their trim packages. We've only set up two 155pumps in the darts. Good point on the cooling lines off pump. I think they are pretty much centered as christian stated. I firgot about that. I set all my own locations on threw hulls. I could see threaded rod being a solution also on mating the pump together in one piece. Means changing a reduction nozzle is a little more work on the fly

 

[JT_Freeride]

Just ordered a 7/12 hooker from impros gonna see how this works. I'm going to be using a full pump out of a gp1200.

 

[stefan]

Just ordered a 7/12 hooker from impros gonna see how this works. I'm going to be using a full pump out of a gp1200.

Whats your setup ??

 

[JT_Freeride]

Rickter FR2 evo-1 hybrid - 701 b-pipe and head 35cc properly tuned I say this because i have ridden a variety of peoples skis when i was testing out AM hulls and some had big power setups that felt weaker than a correctly set up 701

 

[Gliderskier]

Rickter FR2 evo-1 hybrid - 701 b-pipe and head 35cc properly tuned I say this because i have ridden a variety of peoples skis when i was testing out AM hulls and some had big power setups that felt weaker than a correctly set up 701

You have yet to have a "properly" tuned 701 yourself

 

[JT_Freeride]

You have yet to have a "properly" tuned 701 yourself

The engine was properly tuned until it ate a ring after xxx amount of hours

 

[96superjet]

Did some copy and paste work here at the end of work today. Figured this might help those in search of a 155mm pump setup. Hope it helps.

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[Gliderskier]

The engine was properly tuned until it ate a ring after xxx amount of hours

And continued to be tuned with no rings for xxx amounts of hours