J-Madd Posted October 26, 2016 Report Posted October 26, 2016 I'm anal but I don't like to see any loss, small intake side leak that minimal no biggie, small crank seal or case mating surface big deal. I see sooooo many of these engines go together with terrible cleaning practices and prep . I'm not saying it's a seal at all but I've seen at least 15 motors test good in one crank position then rotate it and it's no Bueno . I've also seen a motor test good on bench but have a semi bad oring in the head and would only let a lil anti freeze in when cylinder was building max pressure then was fine again. I've seen motors with low static pressure but high uccr lift the head because of a lil deto and cause a coolant interference with symptoms like yours . It could be as simple as wrong needle . Could be 1000 things that's why I start with basics 1- get motor to hold air with no leaks 2- put timing at zero to start 3- new plugs 4- electronics test in your case get a known good coil that test out 5- fresh fuel 6- set slides even with proper cable play without idle screws in 7- install idle screw and set sync to 5 cfm with vacuum gauge 8- make sure exhaust packing is good 9- make sure carb clamps get tight enouph to not allow leaks 10- gap plugs 11- make sure exhaust orings are good by head mount ^^^real advice from a builder. Not a parts changer. @Dan - yes that's exactly what I meant about the checking for a leak there. Quote
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