Hi,

can anyone give me the length and/or OD of XR1200 pushrod tubes?

Trying to see if I can make them work on a big twin, if they will hold the o-rings in place.

Some say the cylinders lengthen/expand as the engines get hot, anything up to 50 thou -- which I have no way to confirm. The old 3 part tubes are sprung which I suppose, in theory, means they could adopt to any expansion. I wonder why it's not a problem for these fixed length ones? Do the XR o-rings take up the difference?

I appreciate the stroke length on these bikes is different, 3.8125" versus 4.250". I have no idea whether the actual pushrod cover/cylinder length/height of the heads are. I've discovered so much of the internals of the rocker boxes are the same it surprised me.

Thanks.

 

Did you ever get and answer on this?

 

He hasn't been on here since 12/5/2015.

 

Guess that answers that..sorry for bumping such an old thread but it was the only place Ive seen anything on the tube dimensions. Anybody have a set of tubes/covers laying around that can measure them for me?

 

 

 

 

Thanks, but if your pile is like mine I wouldnt ask you to dig to the bottom for me, its not that important. I stumble upon this and thought it would be a fun little project to make on the lathe if I could dig up the dimensions