Taking weight off a hw97 piston

[ElmerFudd.177]

How would any of you tuners out there take some weight out of the hw97 piston?

The start weight is around 265 grams if i remember, what weight should i aim for?

Im going to be fitting a tinbum short stroke and drop in kit, deburr and polish all internals fit a spring sleeve,

Any other suggestions welcomed...

[ElmerFudd.177]

Done some reading through some old threads and it appears that the magic number is between 220 and 250 grams but have to make the transfer port larger to around 3.9mm and taper inside the compression tube to allow easier flow for a lighter piston.

If im wrong can someone tell me as im planning this for next week please.

Thanks

[buttloaves]

Drill some holes in it..

[Shed tuner]

Drill some holes in it..

yeah, and just skim a bit off the body. play with the TP last to fine tune, but yes, will probably need opening to at least 3.5 (assume it's a 26mm). In terms of target weight 210-220g should be perfect for a 26mm.

[ElmerFudd.177]

Yes it is 26mm...

Do the holes have to be opposite to balance the piston?
And which size drill bit to use? (Obviously smaller drill bit = more holes)

Thank you

[buttloaves]

Wonder if the center of gravity has any effect, are pistons better front heavy or skirt heavy, i would think front heavy is best but i could be wrong..