got my cylinder at napa gonna have him take the sleeve out any tricks getting it out? thanks alot.mike.

 

I threw a jug in a campfire before. When I picked it up, all the cylinders fell out. The guys that do big bore kits just bore the cylinder right outta the jug, usually.

 

this chrome moly will not cut. napa wasted a set of there cutting blades on it and did not get nothing off of it. maybe they can heat the sleeve and get it out. i would not want to heat the whole jug all that heat can weaken the aluminum.

 

It sounds like you guys are about to ruin a good jug. Heating the cylinder in the jug will only make it harder to get out. If anything, heat the jug and put ice on the cylinder.

How do you think they will get the new cylinder in??? They will heat the jug up with a lot of heat. The hole in the jug is smaller than the outside diameter of the cylinder. Its an interference fit. So, they have to heat it to make the hole in the jug bigger.

I don't believe heating aluminum makes it weaker. I don't think its like steel,,, case hardened. Also, I don't think it matters even if the aluminum does get weaker. All it has to do is hold the cylinder in place. And on top of all this,,, even to make steel weaker, you have to heat it close to red hot. I don't think you'd need to heat it that much to make the aluminum expand suffiently. The only thing to remember is to heat aluminum uniformly or it will distort. Its like heating glass, you have to do it uniformly or it will crack. Also cooling uniformly too.

I don't know if the guys at napa know what they're doing or not (sounds like they don't - doesn't surprise me), but they can only take .010-.020 off at a time or they will wreck the cutting tools. Maybe even less than that. I'm not a machinist by trade, but I know that much.

 

he is gonna freeze the new sleeve before installing it. i would never throw my jug in a camp fire..

 

.... you asked for tricks. [img]i/expressions/face-icon-small-wink.gif[/img]

 

ok this is the deal if you ever start to over haul your kfx400. it is the same cylinder as the dr400z suzuki dirtbike. and the artic cat and ltz400. ok now the cyclinder on these are chrome line plated bore you can not bore them. you can not heat the stock cylinder to remove it. and you will have to have the stock bore cut out not a east task. i bought a big bore kit 440.cc and a 12:5-1 compression piston kit. gonna send all to advanced sleeve for the install all in all kit and labor and shipping it is gonna cost me $396.00 but it should be a machine when done.