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I know I'm not supposed to suggest this , but , I now have over 1/4 million kilometers on my Le Mans 2 , the rods have beenoff twice to check the big end . Over 2/3's of that mileage has been with it kitted ( 70 Rear wheel horsepower ) and shown nomercy . They are the original bolts and nuts on the rods . I believe they are up to the task :) . Peter
Agree 110%!Worrying about stock rod bolts as a weak link should probably be priority number 10,001 in terms of MG quality and reliability.In the absence of obvious damage, use the stock rod bolts. Attempting to measure bolt stretch without sophisticated ultrasonic equipment is very questionable.
Mopartnut,Effective & simple, bearings would make measuring much more accurate. I didn’t realize dimples on both ends for that purpose; I figured it was more for lightening. The replacements sold by MG & HMB look to have a dimple on the threaded end.Rough Edge,You’re spot on, the measures for the 9mm Guzzi bolts fell right in that zone. I’ve heard of resizing connecting rods but don’t know much about it. New bolts should be installed beforehand - are the bearing shells chosen after the resizing process is completed?I see you have a couple of land speed bikes. Bonneville? Those events must be one of the ultimate tests of design & fabrication skills. What would you say is the 2 valve Guzzi’s weakest link at high speed? Valve train?Thanks,Charles