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Old 03-03-2007, 01:56 AM   #5 (permalink)
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springer-'s Avatar
Join Date: Mar 2005
Location: Maine
Posts: 10,841
springer- is still riding a stock bike springer- is still riding a stock bike
Valve Job....
Picture #11 is a little complicated to explain. What we are looking at is the intake valve seat. The seat was replace for the over sized valves. There is no easy way to say it so I will just say it, This is the worst valve job I have ever seen.

The YELLOW letters (A, B and C) and YELLOW arrows point to a ridge in the valve contact area. "C" is pointing to a flat ridge area that protrudes from the valve seat. The ridge tappers as it approaches "B" and fades away completely by the time it reaches "A". IMO, there is no way that valve could seat properly.

If you follow the same line as the ridge and follow it around to the RED letter "D", you will see between the RED arrows the angle is nearly gone. That is suppose to be one of the angles for the valve job.

The GREEN arrows at letter "E" show the valve seat contact area with the valve. That contact area should be well defined all the way around the valve seat. Note at the GREEN arrow at letter "F", the contact area fades and all but disappears.

Picture #12 is after Bean did a valve job to address the prior valve jobs short comings. The RED arrows show the valve seat contact area. Note the well defined contact area. You can easily follow it around the circumference of the seat. Note the well defined angles and lack of any ridge.

Picture #13 is during the valve job. When cutting the seats, any irregularities are signs of other issues. In this case you can see the first cut of the valve job. At letter "A" note the width of the cut. Now look at "B" and then "C". "A" is narrow, "B" is a little wider and "C" is the widest. This is an indication of 2 possible issues. First is the seat is not installed perpendicular to the valve guide. Second is the seat is offset from the center of the valve guide. Either of these 2 issues can make it difficult to obtain a good valve job. The valve seats, in this case, were almost not recoverable.

Picture #14 is a close up showing "B" and "C" from the previous picture.

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