trailrider Posted November 2, 2005 Share Posted November 2, 2005 I recently purchased a 78 Brat (cheap) and it ran great for about 1,000 miles. It then began losing power, and a compression check showed 90 psi in No. 2 cylinder, 120 psi in 1,3 & 4. Oil inserted in the plug hole brought the pressure up to 120 psi. I removed the engine, an EA71, 1600 cc with dual carbs., and the left head and no. 2 piston, but can't see anything obviously wrong with it. I thought I would replace the cylinder sleeve and rings, but cannot locate sleeves for it. Has anyone been through this and found parts sources? The Brat was getting about 27 mpg but has a lot of rust so I don't want to spend a lot of money on it. Thanks for any advice. Trailrider. Quote Link to comment Share on other sites More sharing options...
zyewdall Posted November 2, 2005 Share Posted November 2, 2005 I recently purchased a 78 Brat (cheap) and it ran great for about 1,000 miles. It then began losing power, and a compression check showed 90 psi in No. 2 cylinder, 120 psi in 1,3 & 4. Oil inserted in the plug hole brought the pressure up to 120 psi. I removed the engine, an EA71, 1600 cc with dual carbs., and the left head and no. 2 piston, but can't see anything obviously wrong with it. I thought I would replace the cylinder sleeve and rings, but cannot locate sleeves for it. Has anyone been through this and found parts sources? The Brat was getting about 27 mpg but has a lot of rust so I don't want to spend a lot of money on it. Thanks for any advice. Trailrider. Does the sleeve show signs of wear? All the suby engines I've taken apart you can still see the original cross hatching on the cylinder walls at 200k miles. If so, a ring job may be all you need. Z Quote Link to comment Share on other sites More sharing options...
Jerry DeMoss Posted November 2, 2005 Share Posted November 2, 2005 I agree you shouldn't need to do anything like sleeve the engine.Just give the cylinders a light hone and put some new rings in there.Should be set after that. Quote Link to comment Share on other sites More sharing options...
trailrider Posted November 3, 2005 Author Share Posted November 3, 2005 Thanks "Z" and Jerry. There are no visible cross hatch patterns on cyls. 2 & 4, and piston nos. have been peened into the tops, so I guess the 92,xxx miles is way off. Is the 120 psi a decent reading for the EA-71 or should it be a lot higher? Thanks again. Trailrider Quote Link to comment Share on other sites More sharing options...
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