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Dirt Bike Brands - Other
Compression release hole?
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[QUOTE="Idaho Charley, post: 126381, member: 19246"] Roadrunner - since I last posted you I had reason to removed my '98 380 cylinder. Measured the (depth) location of the hole. The top of the decompression hole is 1 and 20/32 inchs down from the cylinder's head surface area. From a visual perspective it appears dead center located to the front of the cylinder. When the power valve is removed you can see where the hole terminates on the exhaust side. I DID NOT think to place a drill bit into the hole in an attempt to determine if the hole was angled. I do not believe it is. The hole could easily be drilled from the outside of the cylinder inward once the power valve has been removed. There is no liquid cooling passages in the immediate area of the hole and no intergal support ribs for the cylinder. Your stock piston rings are pinned in a different area and therefore I would quess you could go from there. Concerns: 1. My primary concern if I were going to install the hole would be the inner plating on the surface of the cylinder. What speed and cutting fluid should I use to minimize the chances of flaking some plating from the cylinder's surface. 2. Can I deburr the hole on the piston's side without compromising the plating? My cylinder's modification was done by H&H and ran about 3000 miles without a hitch. BTW - if the spring you are breaking is the small pawl spring; the hole will not have any effect one way or the other. I replace mine yearly and it always appears it- is- just- in- time. (Yes I have chamfered the top of the spring retaining hole and it helps but does not eliminate the binding problem) Eric should have my cylinder this friday for his 1mm performance package upgrade. Maybe he will share additional information with you. Unless your "free shop work" involves an experienced person: it may end up costing you many times the 50 to 100 dollars you saved. Best-of-luck to you!! [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Compression release hole?
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