Topic: How to remove stuck oil jets in heads?

[01Thomas]

Great Idea and thanks for sharing, Per!

I have removed mine. Really easy and a quick job if you know the trick
Hydraulic...
A friend of mine told me how to do yesterday when I was talking about this
He is an old CB750 mechanic since his dragracing days in the 70-80's. Restore other bikes too.

The oil flow thru the 2 oil feed holes that also house 2 cylinder studs.
1. Thread the stud hole on top. I used M10 that can be used direct in existing hole.
2. Plug that stud hole with an M10 bolt
3. Flip head and place it on a container that cover the orifice.
4. Fill stud hole with oil. I used Motul 20w-50. I'm sure any oil will due, even synthetic! 
5. Place a 9mm drill in that hole, bottom first, and whack it down with a heavy plastic hammer.
6. Plop!! The orifice is now in the container
7. Drill was stucked in head for me so flip head and remove bolt, use a thinner pin and tap drill out.
8. Clean orifices and make sure the oil holes inside where the orifices sits are clean.

I'll grind my orifices outside a little with grit 800-1000 to make sure they can be removed easier from top next time.  When cam and towers are removed, perfect reason to clean the oil path with oil filter removed and flush oil passages clean with degreaser. I do no longer trust oil filter that might let particles thru or it can disintegrate it self.

[754]

Rather than tap it , run a though bolt 2 sealing washers and a nut,
For the 9mm shaft, turn a piece on the lathe if you got one.. hard on drill bit and hammer to pound hard on it.

[PeWe]

The bottom end of a 9mm drill fit perfect in hole and work as a piston pressing the oil further. I did not need to use much force, only one distinct stroke by the heavy nylon hammer. Drill had a little bit too god fit a 2" in or so.

The M10 bolt was only tightened by fingers. I found M10 x 1.25 tap (fine thread) in my tap box. I did not find a short matching bolt so I used M10 std bolt, M10 x 1.5, tightened it lightly by finger force.

Really important to clean head afterwards. My head will be refurbished so it will need a clean anyway.

This is a good example of using std tools without heavy shop machinery. The M10 tap, the only thing everyone might not have on the shelf.
Maybe possible to plug the hole with a rubber cone that is pressed against the surface, under the oil orifice a hole where it can pop out.

[Ace]

Now you come out with this method after I needed it PeWe. Good one for next time.

I have removed mine. Really easy and a quick job if you know the trick
Hydraulic...
A friend of mine told me how to do yesterday when I was talking about this
He is an old CB750 mechanic since his dragracing days in the 70-80's. Restore other bikes too.

The oil flow thru the 2 oil feed holes that also house 2 cylinder studs.
1. Thread the stud hole on top. I used M10 that can be used direct in existing hole.
2. Plug that stud hole with an M10 bolt
3. Flip head and place it on a container that cover the orifice.
4. Fill stud hole with oil. I used Motul 20w-50. I'm sure any oil will due, even synthetic! 
5. Place a 9mm drill in that hole, bottom first, and whack it down with a heavy plastic hammer.
6. Plop!! The orifice is now in the container
7. Drill was stucked in head for me so flip head and remove bolt, use a thinner pin and tap drill out.
8. Clean orifices and make sure the oil holes inside where the orifices sits are clean.

I'll grind my orifices outside a little with grit 800-1000 to make sure they can be removed easier from top next time.  When cam and towers are removed, perfect reason to clean the oil path with oil filter removed and flush oil passages clean with degreaser. I do no longer trust oil filter that might let particles thru or it can disintegrate it self.

[Ace]

754 the head was beyond repair before I cut the jet out, that's why it was my test head.

Geez 89.66 each from Yamiya..
 I could build onesies for way less, most people could..

Your head may have been repairable, if it was, it sure is not now... that you cut the jet out..

[PeWe]

Ace, this is news for me too
Best working mechanical hint I have ever got.
Find a head and try

[Kook652]

I have removed mine. Really easy and a quick job if you know the trick
Hydraulic...
A friend of mine told me how to do yesterday when I was talking about this
He is an old CB750 mechanic since his dragracing days in the 70-80's. Restore other bikes too.

The oil flow thru the 2 oil feed holes that also house 2 cylinder studs.
1. Thread the stud hole on top. I used M10 that can be used direct in existing hole.
2. Plug that stud hole with an M10 bolt
3. Flip head and place it on a container that cover the orifice.
4. Fill stud hole with oil. I used Motul 20w-50. I'm sure any oil will due, even synthetic! 
5. Place a 9mm drill in that hole, bottom first, and whack it down with a heavy plastic hammer.
6. Plop!! The orifice is now in the container
7. Drill was stucked in head for me so flip head and remove bolt, use a thinner pin and tap drill out.
8. Clean orifices and make sure the oil holes inside where the orifices sits are clean.

I'll grind my orifices outside a little with grit 800-1000 to make sure they can be removed easier from top next time.  When cam and towers are removed, perfect reason to clean the oil path with oil filter removed and flush oil passages clean with degreaser. I do no longer trust oil filter that might let particles thru or it can disintegrate it self.

Perfect. Thank you!