1973 750 Tiger Rocker Box Bolts

RTillery02 · Jan 1, 2020

Somewhat of a ...technical question, Has anyone had the need to helicoil the rockerbox 1/4 inch threads that are in the head? I've got a kit to put some fresh 1/4 inch helicoils in all 4 damaged holes, but is there "room" to upgrade'em to 5/16 threads? I recall my 70s' model t100c had the same issue that I had to deal with. Is it practical to bore the box holes out & install 5/16 helicoils in the head?

joe mc donald · Jan 1, 2020

RTillery02.
If I was going to that I would use inserts rather than helicoils. Better job and stronger.
Welcome to the family. Do hit the upload a file button bottom right corner and show the inmates your steed.
Happy New Year.
Joe.

darkman · Jan 1, 2020

Stick with a 1/4 as 5/16 inserts will split the already thin head casting.

RTillery02 · Jan 2, 2020

darkman said: ↑

Stick with a 1/4 as 5/16 inserts will split the already thin head casting.
Click to expand...

Yup, that was my concern, plus, the last 1/4 inch threads worked out just fine so I'll stay with it. Thanks Drkmn.