Perplexed in Iowa
Okay folks need some help. We have a ATC 90 Bored 5mm over, stroked, ported head, bigger cam, heavy duty valve springs. The machine smokes bad, runs good, idles good, good compression. We’ve had the top end off 4x now. The trike is actually dripping oil out of the exhaust. We have Inspected rings (new rocky) without taking off piston and no obvious signs of breakage. We’ve inspected the valve guide with no obvious signs of breakage. We thought after our last pull off that we had found the problem with us forgetting to put in a stud guide where the oil seal goes. That didn’t solve the issue either. We did have a bad tick and that was caused by the intake valve hitting the piston we have fixed that. We have rebuilt 50 of these or so and have never had one smoke like this before. We are now leaning towards a bad exhaust valve guide. Any thoughts as to what we could be missing here?
90 nickolson Bored and Stroked "The Good"
Big Bore 110 Pauter frame "The Bad"
90 Bored and Stroked “vey’s frame” "The Ugly"
110 JSC frame Bored and Stroked
flat track build. “Shop trike”
1974 original 90 X 2
1974 Original 70.