|
Post by raychappo on Jul 4, 2012 17:57:14 GMT -5
Is there anyone in the Midlands area who has an RE compression tester I could borrow for an afternoon please? I'm in Leicester. I'd like to check the spare engine I have before I strip the proper unit. I checked it with a normal compression tester before I took it out of the bike and it was low. I've since found that the port valve was seized completely shut and I know for a good compression test the inlet should be wide open. During the initial test I now realise it was jammed closed even with the throttle wide open. It is probably still low but I think its worth a test before I disassemble the unit. Any help would be appreciated. Thanks Ray
|
|
|
Post by wayne on Jul 4, 2012 18:20:56 GMT -5
Ray, the fact that your port valve was jammed closed is, I suspect, not relevant.
When you open the throttle full during the compression test you are physically opening the primary butterfly and if it wasn't jammed, you would also be opening the port valve.
However, the secondary throat remains closed anyway as it is not connected to any throttle cable. As the port valve only restricts the secondary throat, it should make little or no difference to the compression test whether it is open or closed.
As per the book, all our compression tests are with primary valve full open but secondary closed and I believe that this is the acceptable "standard".
|
|
|
Post by raychappo on Jul 4, 2012 18:26:14 GMT -5
I guess you are right Wayne, now I think about it. It was just a last chance that I may have read the compression wrong and hoped that I would have a reasonable spare proper instead of a project to strip it down and see if it could be recovered.
|
|
|
Post by wayne on Jul 5, 2012 18:12:59 GMT -5
Don't worry, I know exactly what you mean. I've held a few "last chance" hopes myself. One of my proper units is way outside book limits for acceptability but within what the mechanics tell me. Besides, it rides well enough, to hell with the book figures !
|
|