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XR1800 4-Stroke MR1 Swap

Robb235

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Boat Make
Yamaha
Year
2000
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X
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18
Got the flat steel rails that I’m using for motor mounts drilled last week, and test fit them over the weekend. I’ve also attached the sketch I drew up for the rails.
You can see in the picture where I cut up the engine bay somewhat so that these MR1 motors will fit. I need to fiberglass that back in, but the temperature has been too chilly lately.


CF668041-F834-4D6D-84BD-3996427CA30A.jpegA81EA003-255A-4380-90C0-CCA7ABA96E89.jpeg
 

Robb235

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Boat Make
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2000
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Got some goodies from Amazon last week.
Epoxy paint for the steel motor mount rails. That Top Side boat paint scratches too easily. My wife used it to paint the bathroom wall tiles in our master bathroom from the 1950’s blue to a nice glossy white color.
Also got the epoxy resin to fiberglass in the holes I had to make in the engine bay. And the gel coat once the fiberglass is complete. Just need the weather to warm up a bit.
A90AAA26-908D-4392-85F5-EFDEDE12891F.jpeg
CD3B5E6E-7727-4518-9412-7EA788F6B70C.jpeg
D02881D5-852E-4EF8-B633-FE2A3061A3F8.jpeg
 

Robb235

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2000
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I’ve done a poor job of taking pictures and posting progress.

I have fiberglassed in the port side engine bay and gel coated, so now the motor will physically fit in there. I’ve drilled, tapped, and painted the steel rails that the motor mounts will attach to. And last night I dropped the port motor into place in the engine bay. I have not hooked up any cooling, electrical, fuel, throttle linkage, exhaust, etc.

Don’t judge the yellow layer on everything. It was literally raining pollen yesterday.
681C4565-4BBD-4907-B17F-F6A281153C10.jpegB91FFB52-6A3D-4AA0-87F1-71F39C5BC606.jpegE65F13CD-B918-448C-A4EF-FE298EE4CC99.jpeg19205472-312D-4C37-83E7-F3D3C914CFA7.jpeg
 

Robb235

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Boat Make
Yamaha
Year
2000
Boat Model
X
Boat Length
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Where can I find some high pressure hose to lengthen the piece that feeds cooling water from the jet pump to the coolant inlet on the motor? What pressure does it need to be rated for? Either #1 or #11 in the picture.
 

Attachments

UnorthodoxCreations

Well-Known Member
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Location
Hanover, PA
Boat Make
Yamaha
Year
2005
Boat Model
AR
Boat Length
23
I went through this on one of my cars recently. You should be able to get hose at AutoZone or similar part of stores, just make sure it's rated for fuel injection.

"High-pressure fuel hose for clamp-type fuel-injection systems is also available. This fuel hose is SAE 30R9-rated and uses a fluoro elastomer inner liner that will withstand up to 180 psi and 300 degrees. It is approved for all fuel blends including straight methanol, and the outer coating is also ozone- and abrasion-resistant. High-pressure fuel-injection hose can also be used in low-pressure applications, but the difference in pricing may convince you to save it for where it is needed."

 

WREKS

Jet Boat Addict
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Location
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Year
2007
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SX
Boat Length
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@Robb235 I would remove the fitting and clamp and match with whatever auto or marine parts can offer. Being once-through cooling there should be little pressure buildup.
 

Robb235

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Boat Make
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Ok, I was thinking the inlet saw quite a bit of pressure since it was coming off the jet pump. Anyone happen to know the inner diameter of this hose? I’m out of town all this week, was hoping I could order online and have it when I got home. Was thinking it was 1/2” or 5/8”.
 

WREKS

Jet Boat Addict
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