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The kit in question is a MZA item (part #15415-A-M); comparing it to the original rod I note a couple of differences :-
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1/ The new rod has a small-end width of 20mm. - the old rod is 20mm. relieved either side of the bearing eye to 17mm., presumably to aid lubricant to reach the s/e needle roller bearing.
2/ The original crankpin (28mm.) is hollow - bored 12mm. throughout. The new crankpin is solid, being merely counterbored with centres.
I'm assuming these differences will also account for a variation in weight; the crankshaft is still assembled at the moment, and so I am unable to actually weigh the old parts to make a direct comparison. I certainly have no wish to put time and money into building an engine that vibrates unnaturally !
Have any of your seasoned members any knowledge/experience of these con.rod kits, and their use in these engines?
And what would be their advice regarding piston choice ?
Thanks in advance,