I build a lot, and I mean a lot of MR1 motors from the VX110 to the FXHO and I am so glad you posted this video. Excellent job figuring that out. This information will go a long way toward helping other people out who have the same question on the forums that I'm on in the future when all else has failed. I have to figure out a way to bookmark this video so I can send it to them later. Question for you though, during the sea trial it looks like you're running around 8000 RPMs. The MR1 FX140 and FXHO run at 10,000 RPMs... Or maybe it's 10,300 I can't remember exactly at this second... Was that sea trial at wide open throttle? If so, something is missing there. What prop and pump are you running? We have played around with different props and that always seems to be the source of RPM loss if it's not the stock pitch
Thanks! It was definitely perplexing trying to hunt down the source of the water infiltration. Thought for sure it was either the head gasket or an exhaust component. But it turned out to be corrosion holes through the cooling jackets of the exhaust manifold. During my sea trial after the rebuild I was running about 3/4 throttle, not wide open. At full throttle I’m getting about 9500 rpm. I’m using a 1998 Yamaha XL1200W 155 mm jet unit, and I’m running a 13/19 pitch impeller. I wish I could run with the larger pump like they use on the VX110, but none of those have a bolt in intake duct like the XL1200.
Hey Rob Since you build mr1s I need to replace the manifold gasket #36 on this diagram. Do I need to take off the cylinder head to get to the exhaust manifold? I took off every bolt I can see just about but there is no nudge whatsoever.
The issue was corrosion holes through the inner wall of the exhaust manifold. Very difficult to try to weld that, or even get it clean enough to attempt to weld it. I’m not really sure why there was corrosion, as I flush my engine after every use. But, it has been in a lot of salt water over the years, and sometimes even your best efforts won’t defeat salt water electrolysis
I build a lot, and I mean a lot of MR1 motors from the VX110 to the FXHO and I am so glad you posted this video. Excellent job figuring that out. This information will go a long way toward helping other people out who have the same question on the forums that I'm on in the future when all else has failed. I have to figure out a way to bookmark this video so I can send it to them later. Question for you though, during the sea trial it looks like you're running around 8000 RPMs. The MR1 FX140 and FXHO run at 10,000 RPMs... Or maybe it's 10,300 I can't remember exactly at this second... Was that sea trial at wide open throttle? If so, something is missing there. What prop and pump are you running? We have played around with different props and that always seems to be the source of RPM loss if it's not the stock pitch
Thanks! It was definitely perplexing trying to hunt down the source of the water infiltration. Thought for sure it was either the head gasket or an exhaust component. But it turned out to be corrosion holes through the cooling jackets of the exhaust manifold.
During my sea trial after the rebuild I was running about 3/4 throttle, not wide open. At full throttle I’m getting about 9500 rpm. I’m using a 1998 Yamaha XL1200W 155 mm jet unit, and I’m running a 13/19 pitch impeller.
I wish I could run with the larger pump like they use on the VX110, but none of those have a bolt in intake duct like the XL1200.
Hey Rob Since you build mr1s I need to replace the manifold gasket #36 on this diagram. Do I need to take off the cylinder head to get to the exhaust manifold? I took off every bolt I can see just about but there is no nudge whatsoever.
Dude here we are in 2024 I’m having this sort of problem. Can you just clean out the ports?
The issue was corrosion holes through the inner wall of the exhaust manifold. Very difficult to try to weld that, or even get it clean enough to attempt to weld it. I’m not really sure why there was corrosion, as I flush my engine after every use. But, it has been in a lot of salt water over the years, and sometimes even your best efforts won’t defeat salt water electrolysis
Oh dam 😮
Yeah, I had a sick feeling in the pit of my stomach when I found water in my oil. It was an involved task, but I got it solved
ts not mr1
No, it’s an MR1