HF Comp Tester Reads Low

HF Comp Tester Reads Low 06 Oct 2011 00:02 #481615

Motor Head
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I bought one of these for the adapter fitting, tried it and it read about 20PSI lower than my trusted gauge. Be careful If you buy one, then decide your Motor has Low Compression! get another know good gauge to verify the reading.
www.harborfreight.com/compression-test-kit-66216.html

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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HF Comp Tester Reads Low 24 Dec 2011 16:02 #494551

Fritula Offline User holly land garage Posts: 46 Thank you received: 0	nothing is made in USA anymore.
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HF Comp Tester Reads Low 24 Dec 2011 16:23 #494554

loudhvx Offline KZr Legend Posts: 10868 Thank you received: 1615	Do the brass spark-plug adapters each have a check valve in them? If not, there goes the compression. I've seen other cheap ones without check valves. They always read very low. It's almost as if the person designing it had no idea what they were for or how they should work. 1981 KZ550 D1 gpz. Kz550 valve train warning. Other links.
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HF Comp Tester Reads Low 24 Dec 2011 17:23 #494561

DoubleDub Visitor	I guess I don't understand - what does the check valve do? Obviously, I don't design these
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HF Comp Tester Reads Low 24 Dec 2011 23:55 #494586

andy9802gt
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DoubleDub wrote: I guess I don't understand - what does the check valve do? Obviously, I don't design these

I would think it keeps the pressure from bleeding back into the cylinder when you stop cranking it over.

'78 KZ1075 LTD
stage 1 head by Larry Cavanaugh
race built crank by John Pearson
Mikuni rs34's
k410 cams
back cut tranny
8" over D&G swinger
proving once again that age and treachery is better than youth and enthusiasm