To all my Trials cohorts across the pond ... I just started rebuilding a basket case Berkly with a Excelsior 3 cyl engine , All is going well except for one detail I can't find any info on anywhere ... What is a appropriate torque spec for these gasket-less cylender heads ????

Thanks for any info in advance !!!

Glenn

Best I can come up with so far ... 5/16 x 24 head studs / nuts ... I don't think anything more than about 18 - 20 ft.lbs. would appropriate considering the age of the unit ... ?

Any opinions ???

Glenn

The cylinder head (which also has no gasket) nuts of my 1975 Bultaco have 8mm studs (= 5/16") should be tightened with 12 ft.lbs.

Edited September 21, 201312 yr by guys

Thanks , that's about what I thought . I've got to do a '58 B95 and then a 58 B60 . Interesting microcars for their time ..

Glenn

What a different !!! little car ! I know, completely off topic , but is a 3 cylinder 2stroke motorcycle engine ... If all finishes off well , I should test drive it today ....

OK ... It starts and runs , Moved it about the shop , Got to fix the throttle linkage and shift linkage before I test drive someone else's barbie car ! (think 1/2 the size of a Miata ...!)

Glenn , Having fun at work !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Drove it today after 3 or 4 hrs of tinkering with the carb balence (DAMN AMALS !) and had the steering shaft unscrew from the box while in a turn @ 30+ ... Got it back to the shop to be told the car was built as a museum display piece and to their knowledge had never been actually driven ...

But it works now ...

Glenn