![]() ![]() ![]() I jury-rigged a fuel supply, filled the float bowls and fired her up. Just to make sure, I rigged the bike up just enough to run it for a few minutes to see if a warm engine would make a difference. I'm thinking uh oh, got bad rings, or scored cylinder. The bike had been running fine, and I had checked the height of all of the pistons through the spark plug hole when I bought it 3 years ago to make sure the PO didn't hydrolock it (all good, no variation) and now I have a 70psi cylinder? I squirted a teaspoon of oil down the plug hole and check again, and when it started cranking, it looked like it would only go to the 70psi mark again, then suddenly the gauge took off and went right to 125psi. All are reading 120psi give or take a lb or 2, until I get to #1, where I get 70psi. I started from the right side, cylinder #4 and work my way to #1. The bike was stone cold, so I expect lowish readings. 145/90 = 1.611, (61% error!) so I can assume I can multiply my 120psi by this to get over 190psi, so I'm not really concerned about the low absolute value. The Harbor Freight unit showed 90psi, while the properly designed unit showed 145psi. I have found reviews of this unit, and all say the same thing, in fact, one reviewer checked it against a gauge with the schrader valve in the proper location. The volume of the hose, including the expansion, would probably be close to half the volume of my little 250cc cylinder! So, this tester is only practical for use on multi-cylinder engines to compare pressures cylinder-to-cylinder, NOT as an accurate absolute value. While the engine was cranking, I could feel the hose pulsating in my hand, and I knew I would get inaccurate numbers. The pressure release valve is located on the gauge itself, at the end of about 28 inches of hose. Before you see my indicated pressures, I must mention that this tester is poorly designed. ![]() So, while my baby is apart waiting for exhaust header gaskets, I bought a compression tester at Harbor Freight, and check my engine. ![]()
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