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kilabeez0
12-31-2011, 05:25 PM
Where can I find a fitting small enough to test compression on small motors? All my attachments are too small.
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dutch1
12-31-2011, 08:13 PM
Most small engine applications are 14mm. Not knowing how your smaller adaptors attach to your compression tester, it's difficult to give any advice. I'd suggest you check with one of the tool distributors like Matco, SnapOn, Mac, etc. They may have something for you, if not, they should be able to point you in the right direction

You may want to check with the manufacturer/seller of your tester.

piston slapper
12-31-2011, 08:48 PM
Ditto Dutch.
You may even want to check Napa.
An easy way to check compression is to pick up the unit by
The rope , if it hits the ground, you don't have enough compression.

Happy New Year
Slapper
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kilabeez0
12-31-2011, 08:52 PM
Well standard 14mm is for regular sized spark plugs in mowers and such. I'm talking like backpack blower plugs. My redmax blower has a tiny plug like my 50 and 70cc Honda motors. I'm not sure what size those are. Any idea? My actron kit from autozone goes down to 10mm so I'm thinking maybe its 8mm?
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dutch1
12-31-2011, 09:43 PM
8mm if 10mm is too large. Champion DJ8J and NGK CMR6H are smaller but never had occasion to know what size they were as my compression kit covers them all.

ArenaLandscaping
12-31-2011, 09:51 PM
8mm if 10mm is too large. Champion DJ8J and NGK CMR6H are smaller but never had occasion to know what size they were as my compression kit covers them all.

What compression test kit do you use? I have the same problem with the smaller size fittings.

kilabeez0
12-31-2011, 09:56 PM
After much googling ill probably make my own. I read to cut the threads off an old plug, break the electrode off, and either weld/jb weld/ or drill out and tap it. Boom custom fitting
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BILLSMOWERS
01-01-2012, 10:32 AM
Small plugs are 10mm i have a ryobi 4 cycle strimmer that has a champion rdz19h plug which is 10mm this is the smallest plug i have seen and my mitivac compression tester fits it fine so you will need a 14mm to 10mm adaptor to convert your compression tester to fit

happy new year

bill

kilabeez0
01-01-2012, 05:07 PM
No I have a 10mm adapter and its too big. My redmax blower has the same size plug as my 50cc Honda motor which I could never find an adapter for
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BILLSMOWERS
01-01-2012, 05:11 PM
No I have a 10mm adapter and its too big. My redmax blower has the same size plug as my 50cc Honda motor which I could never find an adapter for
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what plug has your machine got fitted? as 10mm is the smallest plug i have seen on lawn / garden machinery here in the uk

bill

kilabeez0
01-01-2012, 07:22 PM
I'm not at home but a search for atc 70 spark plug says its a c7hsa. I know that is correct I remember. I'll reply tomorrow as to what plug is in my blower.
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BILLSMOWERS
01-02-2012, 03:51 AM
i'm not at home but a search for atc 70 spark plug says its a c7hsa. I know that is correct i remember. I'll reply tomorrow as to what plug is in my blower.
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ngk c7hsa is 10mm thread the a7tc plug is a chinese plug ( torch etc )

bill

kilabeez0
01-02-2012, 11:28 AM
Ok well most kits come with a 10mm adapter, its a common size. When I was really into atc's the question would always come up on what people would do to find an adapter for their 70. That said the plug on my blower is the same size.
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randy448
01-02-2012, 01:24 PM
Buy a new plug, break porcelain out and weld pipe fitting on to old shell.My Snap -On tester uses quick connect same as air hose end.