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Old 02-12-2016, 08:35 PM
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sbest sbest is offline
Motorized Bicycle Elite Member
Join Date: Nov 2015
Location: Nova Scotia
Posts: 249
Default Re: Threaded rod? Bolts?studs?

8.8 is standard ISO grade for industry and plenty strong for these engines. 10.9 may be a little brittle for exhaust and motor mounts but fine for head studs. Studs are kinder to aluminum threads than bolts. Twisting a bolt under load into aluminum is very hard on the aluminum threads and will strip them quite quickly. Most hardware store threaded rod and bulk bolts are lower grade, so read the grade. Metric should be 8.8

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