No compression on start-up?
Posted June 17, 2002 - 05:55 AM
Posted June 17, 2002 - 06:08 AM
Posted June 17, 2002 - 07:54 PM
I rode it that way for several months. It would simply kick through with "no compression". I would still be able to get it started, and once it warmed up, I wouldn't have that problem for the rest of the day. I would be able to start it up going through the normal starting procedures, and it would have plenty of compression from that point on, until it sat for awhile (overnight). After sitting, it would seem as though it didn't have any compression, and I would start over.
When I finally got around to tearing in to it, I found the exhuast valve on the right side (the one that the decompression arm pushes) was actually hanging open. When I tore the head apart, all the components looked good (valve guide, valve spring, valve, bucket). Somehow the spring would get a little cocked and missalign the bucket. Since all this stuff resides in a "hole" in the head with pretty close tolerances (you'll see once you take the valve cover off), any missalignment would cause the bucket to rub against the side of hole. There was actually a burr that the bucket would hang up on as the valve returned to the closed postition. When it was warmed up, it was fine. But if the engine was cold, the first time you kicked it over the valve would open, the bucket would hang up on the burr, and the valve would remain open until it actually started and warmed up. I simply removed the burr, and replaced all the valve compenents in that hole for good measure, even thou!
gh I could find nothing wrong with them. I haven't had any problems since.
Hope this helps out, let me know if I wasn't too clear....
Posted June 18, 2002 - 03:13 AM