Merc xr6 150/200 differences

**seef158** · 05-17-2019, 10:00 PM

What is different between the 150 And 200 merc xr6 engines?Wondering how easy to hop a 150 up to 200 or better.... Thanks in advance

**rock** · 05-18-2019, 06:07 AM

Big difference in ports and exhaust chest. Not "easy" things to change but it can be done.

Rock

**seef158** · 05-18-2019, 08:32 AM

Thanks Rock.

**mach351** · 05-18-2019, 11:41 AM

Early xr6’s had tiny carbs....I switched mine out with 200 carbs before I ever ran it, so I can’t really tell you about the difference, but it had to be somewhat substantial.

**Merc 2.5** · 05-18-2019, 11:56 AM

Originally Posted by mach351

Early xr6’s had tiny carbs....I switched mine out with 200 carbs before I ever ran it, so I can’t really tell you about the difference, but it had to be somewhat substantial.

Goin with 200 carbs on a 150 is the best improvement I did on my old one , It was a seat of the pants difference with added rpm , also put short tuner in , combo worked real gud for 150

**Glastron1987** · 05-19-2019, 07:04 PM

Any idea how much power increase can be gained with just switching to 200 carbs, versus the mods to the porting, versus the mods to the exhaust chest?

**eli** · 05-19-2019, 07:48 PM

if your carbs have 1.0 venturi most xr6 do going to 1.315 venturi 200 carbs will make a difference for money well spent

**Glastron1987** · 05-19-2019, 08:31 PM

Originally Posted by eli

if your carbs have 1.0 venturi most xr6 do going to 1.315 venturi 200 carbs will make a difference for money well spent

Oh that is interesting, thanks. The regular 150 I'm working on seems to have the big ones. Will have to check my XR4 next chance I get.

**eli** · 05-19-2019, 09:59 PM

venturi should have a number 84 visible from carb throat for 1.315

**Glastron1987** · 05-20-2019, 05:57 AM

Originally Posted by eli

venturi should have a number 84 visible from carb throat for 1.315

Good tip. I did notice that on my regular 150. Wondered if that meant something.

**CircleHook** · 05-22-2019, 01:36 PM

Originally Posted by Glastron1987

Good tip. I did notice that on my regular 150. Wondered if that meant something.

Guys what about exhaust reliefs on 150 that 200 hp do not have? Would require new sleeves but the Power!!

**Merc 2.5** · 05-23-2019, 10:16 PM

Sum 200s do have those reliefs I believe , wanna say round 91 92 , only difference is lower #s on compression guage, if we talking bout same thing that is , Perry has built a few relief motors and say they run very strong , said he did it because everyone sayin couldn't get gud power from em but he said diff