The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: sean on 03.01. 2013 01:25

Title: CCP
Post by: sean on 03.01. 2013 01:25
Hi
what kind of reading should I be getting on a 1962 super rocket [stock motor] on the compression guage ?
thanks
Title: Re: CCP
Post by: saltbox Alf on 04.01. 2013 00:09
In general terms the reading should be between 120 up to 160 lbs, unless you are running 10.5 to 1 or somthing as exotic :o, the most important thing being the cylinders should be within a few pounds of each other, if not, then time to investigate why not.
If you are getting 100 lb or  less, time for a rebuild!
Title: Re: CCP
Post by: sean on 04.01. 2013 00:40
thanks
this is a stock motor no hc pistons or anything ......been sitting for a long time just checking things over as the rings were stuck in the barrel
Title: Re: CCP
Post by: muskrat on 04.01. 2013 19:32
G'day Sean, ditto what Alf said. If the rings were stuck in the bore I'd at least throw new rings in and if there is any etching in the bore a rebore next size up with new pistons & rings.
Cheers