Thread: Polaris 1200 powered Rio Jetboat
06-02-2013, 10:27 PM #1
Polaris 1200 powered Rio Jetboat
New project... and a little unique... thought I'd share
2001 Sun n' Sea Rio Step Jet. It's a small, 15ft, 1000lbs, 4-seat, fiberglass jetboat... made by Sugar Sand Marine and sold under the Sun n' Sea nameplate. It's a modified SS Tango hull with a unique large step build into it. It is powered by a Polaris red domestic 1200 carbureted, 2-stroke, 135hp engine... same engine used in the Genesis and Virage models... and uses a Polaris extended jet pump setup.
I picked up my Rio with a holed center cylinder piston and partially disassembled... but in otherwise decent condition.
06-02-2013, 10:37 PM #2
So first order of business was pulling the engine. I'm not sure why... but the hull is an oily mess. I suspect the line from the oil tank came off or broke and it flooded the hull with a couple gallons of oil... then some water got in the hull with the bilge not working... and you get a big mess.
First "issue" to run across... seems like they used thinner long bolts to bolt the extended pump together. Well... 3 of the 4 of these twisted and broke off at the top of the threads. Thankfully, they left me an inch to get some vise-grips on and hopefully get them extracted.
Here's the unique reverse linkage. The reverse bucket is all metal... that was a surprise... not plastic. And the linkage pivots off the hull with an additional linkage. The reverse bucket rests in the half-way down, "neutral" position, when the boat throttle is in the middle (neutral... idle).
06-02-2013, 11:33 PM #3
So I was disassembling the Keihin carb set today... trying to see if I could find what caused the lean condition that put a hole in the center cylinder piston. The carbs are very clean and don't look like they've ever been messed with before. I did find lots of gunk clogging the screen beneath the fuel valve seat. It was pretty bad. This engine has a large external fuel filter... so not sure where this gunk came from.
The middle carb was dry when I pulled the diaphragm off. Whereas the MAG and PTO ones were wet with gas. Guess that could have been how she went out... sudden lean condition due to fuel starvation possibly caused by clogged fuel filter screen.
I noted all the jet sizes. #42 mid jets, #65 pilot jets, low speed screws all set at 1-1/4 out. Main jets: MAG=#140, CEN=#135, PTO=#142.
But then I saw this post here listing the 2000 Virage TX carb settings (same engine).
It appears my CEN and PTO main jets are mixed up ?? Can anyone confirm that?
Lastly... my stock 70g silver spring in the CEN carb was kinked... making it a tad longer... and thus stiffer to lift the needle off the seat. I'm pretty positive it came out that way and that I didn't cause it. So... perhaps the mixed up jets and a messed up spring were the reasons the CEN holed a piston?
Anybody got a spare silver, Keihin 70g carb spring?
06-02-2013, 11:50 PM #4
- Join Date
- Aug 2006
- Pittsfield, MA
06-03-2013, 11:41 PM #5
Thanks! It's not bad from 50ft away. Just don't pop the hatch yet. I still have to clean out the mess!
So I'm still wondering about the main jets in my carbs: MAG=#140, CEN=#135, PTO=#142
Now the engine is supposed to be just like the 1200 in the Virage TX and Genesis
The 2000 Virage TX main jets are: MAG=#140, CEN=#142, PTO=#135
And the 2000 Genesis lists 40mm w/ 31mm venturi... but my carbs are the 40mm w/ 35mm venturi like in the Virage TX.
Does anyone know the jet sizes on the 2001 or 2002 Genesis?
06-04-2013, 05:19 PM #6
2001,2002 Genesis Mains M132 C138 P142 MID 50 Pilot 68
06-04-2013, 05:47 PM #7
All these different jettings... so darned confusing. Okay... while my Rio is closer in size to the 4-seater Genesis... it appears to me to have the same engine as the Virage TX.
The Genesis 1200 had the log exhaust manifold in '00 and '01... from what I've been able to find. My Rio has the more common 3-into-1 exhaust manifold and big red pipe, like on the Virage TX. I also see the '00 Genesis is listed as 40mm Keihins w/ 31mm venturies, but I'm not sure about '01. My Rio and the Virage TX both have 40mm Keihins w/ 35mm venturies. So these differences would explain the different jettings between them.
So I'm wondering if I should swap my CEN and PTO carb main jets to make them match the Virage TX. They seem to be the same in all other regards. And the CEN cylinder was the one to run lean and melt a hole in the piston.
06-04-2013, 06:56 PM #8
My 01 Rio has: MAG=#142, CEN=#145, PTO=#138 all with #65 Mids and #60 Lows. Carb Part Number 1253410 (Same as Genesis).
Mine had oil all over from a leaking oil tank (the float switch leaked). Replaced it with a tank from a SLH. (See Pictures) This allowed me to recoup storage space, no leaking all over my storage compartment and have a variable oil sender. You will want to disconnect the one you have as it cuts the engine rpm eveytime the switch trips after you hit a wave. Very annoying.
The funny thing is, the SLH has a MUCH smaller tank, but you end up with the same usable oil storage. The stock tank low mark is at 50% and the high mark is at 85%. Most of the oil in the tank never gets used (Well over a gallon!)
Any chance you can take a pic of all the wirirng coming from the electrical box, I want to see if they revised it at all.
BTW, You need to order a windshield!
Last edited by ghostinstallations; 06-04-2013 at 07:21 PM.
06-05-2013, 10:46 PM #9
I had a dirty oily hull do to some rookie problems and found DAWN dishwashing soap to take on the oil very well
06-06-2013, 08:59 AM #10
So looking at that engine compartment my first thought was it seems a little dirty, then my second thought was LOOK AT ALL THAT FRIGGING ROOM IT HAS!!!
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