Johnson Honing Cylinders (#2)

[Chrisravosa36]

I just bought a new hone, it cost me 30$ on amazon, its rated for 2in to 7in bores and has 4 inch stones and I cannot seem to get the stones past the fuel and air mixture ports in the cylinder wall. the stones just get stuck and stuff. ANy tips? Its a 74' Johnson. Should I put something in the fuel air fixture? maybe carve a piece of wood?

 

[flyingscott]

Start the hone bottomed in the cylinder and when you start and do not let the pivots come out of the bore. You may have to shorten your stroke to keep the ends out of the ports the cross hatch which will be fine. 4" stones are pretty long

 

[Faztbullet]

One reason you use a rigid hone as a spring style has pivot points....

 

[Chrisravosa36]

Start the hone bottomed in the cylinder and when you start and do not let the pivots come out of the bore. You may have to shorten your stroke to keep the ends out of the ports the cross hatch which will be fine. 4" stones are pretty long

Im having a hard time understanding what you are saying. What do you mean "Bottomed to the cylinder", and what are the "Piviot points?" lasty, what is a shortened stroke? do you mean the amount back and forth?

 

[bob johnson]

Im having a hard time understanding what you are saying. What do you mean "Bottomed to the cylinder", and what are the "Piviot points?" lasty, what is a shortened stroke? do you mean the amount back and forth?

unfortunately your learning curve will be constant. you are at a tough point..THE VERY beginning of learning how to work on motors. tread slowly or you will ruin your motor.... your absolute best bet at this point is to go to youtube and look at videos.... it is insane how much people video things....

the stones are 4" long... they attach to the spring arms of your hone in a specific spot...that spot is called the pivot joint..... is more than 50% of the hone is in the bore the stone will stay straight...once more than 50 % is out of the hole...the stone can PIVOT..and you will make the mouth of the bore larger....BAD!! you want a STRIGHT round hole.....I am not sure what motor you are honing, so I have no idea the shape of the ports.... some motors like the kind I run have an abrupt flat bottom which make it VERY difficult to hone by hand.... other motor have the bore break open...as in a through hole!!!! so you can run the hone past the opening slightly on BOTH ends...to and bottom..... are you trying to just scuff up the ID( inside diameter) of the bore.? or are you trying to remove scratches and grooves from the bore????


to me this is such an important part of rebuilding a motor....Id hand it off to a professional unless I was well equipped and experienced.......there is so much more than is within your grasp to fiddle with...... but some of it should be deligated out!!

good luck

bob

 

[flyingscott]

Ok I will try to explain again Bob was exactly right about not having the pivot points come out of the bore. I do disagree you can do it yourself. The end you are starting from we will call the top of the bore. Take the hone and squeeze it and put it into the bore as deep as it will go that is your starting point. Make sure you have lube in there. Now start the hone turning slowly and start moving it up and down don't let the end of the stones cross the port. I use a battery drill on the speed setting of 1 that works well for me. If you took the pistons out attached to the crank that means you have a clear hole you have to watch the pivots on both ends. If you had to take the connecting rod off and push the piston out the top. You have to be careful then because the hone won't go all the way through don't bang the stones up.

 

[rothfm]

Lately I have been using a Flex Hone with good results. Its a round head made up of many min-globules. Seems forgiving and never takes off much but leaves a nice clean, mild cross-hatch. Glides over ports easily too.

Just my 2cents

 

[Chrisravosa36]

The motor is a 74' Johnson 50hp 2Cylinder. Its got ports that are in a rectangle shape, at the back of the bore. The exsaust ports are no problem. So is there a way I got make the springs only go out just a little more than I need? Is there a way to adjust it so it can only go out so much?