MF 150 head removal

[rsallen]

Hope the job takes care of your miss.

 

[crowbar032]

Hope the job takes care of your miss.

It better, otherwise I'm out of ideas. I've switched over to an electronic ignition, done a complete tune-up (plugs, wires, cap and button), and rebuild the carb and it still had a miss. One of the valves looked pretty black and carboned up when I got it off,so I'm cautiously optimistic this should finally fix the issue.

 

[crowbar032]

So I finally got the head back and spent last Saturday starting the reassembly process. I also got a replacement manifold due to extreme pitting of the original. That is where I ran into trouble. It is supposed to be direct replacement, but like most things of questionable Chinese origin, its adjust to fit. The tubes were too wide which wouldn't allow the nuts to be threaded onto the studs. I had to take a dremel and grind some high spots down. Then the heat shield. I don't know who the sadistic SOB was that put this over the outside top two studs, but if I ever find him...... I had to turn the wrench sideways and use a screwdriver in the box end for leverage. Torquing to proper spec with a torque wrench was impossible. I still need to adjust the valves, but ran out of time this weekend.

 

[The kid]

So I finally got the head back and spent last Saturday starting the reassembly process. I also got a replacement manifold due to extreme pitting of the original. That is where I ran into trouble. It is supposed to be direct replacement, but like most things of questionable Chinese origin, its adjust to fit. The tubes were too wide which wouldn't allow the nuts to be threaded onto the studs. I had to take a dremel and grind some high spots down. Then the heat shield. I don't know who the sadistic SOB was that put this over the outside top two studs, but if I ever find him...... I had to turn the wrench sideways and use a screwdriver in the box end for leverage. Torquing to proper spec with a torque wrench was impossible. I still need to adjust the valves, but ran out of time this weekend.

I have pictures on my Refurbish thread where I modified the heat shield and the manifold. They probably had special tools for just this proceedure. I ran into the same problem as you have. -kid