elefantrider wrote:Why and when did the factory switch to 3/8 size bolts instead of 5/16 size as used on Atlas/P11?
Is this a common upgrade to do now? The machine shop offered to convert when sent parts there for machine work, but we declined.
Seems to be holding fine.
Now fast forward to another project and we are trying to match up a good used barrel with the bike's original P11 head.
Turns out we have a good used barrel but it has 3/8 holes. It has the exact same stamping number as the original 5/16
Have many of you have upgraded to 3/8 bolts?
pierodn wrote:I have a 1969 R type 20M3/130... with Commando head but still the 5/16 bolts.
elefantrider wrote:pierodn wrote:I have a 1969 R type 20M3/130... with Commando head but still the 5/16 bolts.
Do you run washers under the head bolts? Holes in head are not too big?
elefantrider wrote:Here is my '68 P11 with 5/16 bolts. As you can see, oil is on the head, accumulating on the left fins. Looks like the oil is coming from the bolt washer area?
elefantrider wrote:It's got a composite flame ring gasket. Wish I knew where the oil is coming from.
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