F250 guy 106 Posted January 11, 2020 (edited) Looking for a good compression tester, can you guys help me out. All I could find is bike master and harbor freight. They only have 14mm to 18mm adapters, no good I need 19. Where is a factory test kit? Edited January 11, 2020 by F250 guy Share this post Link to post Share on other sites
SlammedRanger 1,437 Posted January 11, 2020 My kit is a craftsman. Got it when our sears store closed a few years ago. I can check to see if it has a 19mm adapter in the kit when i get home. Im pretty sure they are like 60-70 bucks new. Share this post Link to post Share on other sites
F250 guy 106 Posted January 11, 2020 10 minutes ago, SlammedRanger said: My kit is a craftsman. Got it when our sears store closed a few years ago. I can check to see if it has a 19mm adapter in the kit when i get home. Im pretty sure they are like 60-70 bucks new. Thank ya bud, could ya answer me this, is it because of can decompressor that the engine has to warmed up for a test? I thought if it's cold that's better cause a true reading. Thanks Share this post Link to post Share on other sites
toodeep 1,705 Posted January 11, 2020 The 300 use a D series spark plug that's 12mm. 1 Share this post Link to post Share on other sites
F250 guy 106 Posted January 11, 2020 3 minutes ago, toodeep said: The 300 use a D series spark plug that's 12mm. So any 12mm adapter will work? Maybe you can answer this, I'm wondering why the engine has to be warmed up for a test, is it cause of the decompression release? I thought cold or not run in a week would be good to do a test. Share this post Link to post Share on other sites
toodeep 1,705 Posted January 11, 2020 12mm with 1.25 thread is the sparkplug hole size. I do compression tests with a cold motor since they are non running when I do them. With a warm engine everything will be expanded and lubed giving the most accurate test on a running machine. 3 1 Share this post Link to post Share on other sites
SlammedRanger 1,437 Posted January 11, 2020 Well it would appear you dont need a 19mm but just for anyones information. The craftsman kit i have goes to 18mm. I have to admit i was wondering why the utility quads would have such a big plug lol. The sport quads all use 12mm or 14mm never seen a quad with a 19mm plug. 2 Share this post Link to post Share on other sites
F250 guy 106 Posted January 11, 2020 38 minutes ago, SlammedRanger said: Well it would appear you dont need a 19mm but just for anyones information. The craftsman kit i have goes to 18mm. I have to admit i was wondering why the utility quads would have such a big plug lol. The sport quads all use 12mm or 14mm never seen a quad with a 19mm plug. I was wrong after I looked it up and it's 12 like you said lol. Share this post Link to post Share on other sites
Wheeler 2,275 Posted January 12, 2020 My compression tester is from NAPA. It’s a good one. 2 Share this post Link to post Share on other sites
F250 guy 106 Posted January 12, 2020 (edited) 22 hours ago, Wheeler said: My compression tester is from NAPA. It’s a good one. Could ya give a number so I'll have something to go on, I thought about Innova brand but chinsy reviews and im looking at OTC this is the link, I don't have industry connections, so I'm asking for folks that do or have had them, what do you recommend and use. https://www.summitracing.com/parts/otc-5606?seid=srese1&gclid=CjwKCAiApOvwBRBUEiwAcZGdGHvwlmecLMxjpDA4q0RwRyHmo_-NbSf3ajRl-5Srv9b0knLzU-qSaBoCug4QAvD_BwE I don't have a leakdown tester so even with the cam decompressor, I should be fine, I doubt Honda posted leakdown specs anyway lol. Edited January 12, 2020 by F250 guy Share this post Link to post Share on other sites
SlammedRanger 1,437 Posted January 12, 2020 Craftsman 47089 is what i have. Has been used hundreds of times. Probably more since ive had it for about 6 or 7 years now. I do compression tests often on pretty much every engine i own or maintaine. 2 Share this post Link to post Share on other sites
SlammedRanger 1,437 Posted January 12, 2020 Looks like it has come down about 25 dollars in price since i bought it too! It was 75ish when i got it. I see it for around 50 bucks. 1 Share this post Link to post Share on other sites
Wheeler 2,275 Posted January 13, 2020 @F250 guy sorry I can't until I get home later this week. But I will! Share this post Link to post Share on other sites
F250 guy 106 Posted January 13, 2020 14 minutes ago, Wheeler said: @F250 guy sorry I can't until I get home later this week. But I will! That's ok no hurry tonight, I gotta Red Kote my tank on my 300 anyway. Share this post Link to post Share on other sites
Wheeler 2,275 Posted January 15, 2020 Here’s the one I have. Works great. 1 Share this post Link to post Share on other sites
F250 guy 106 Posted January 15, 2020 45 minutes ago, Wheeler said: Here’s the one I have. Works great. Thanks man I found the OTC 5606 kit on Amazon for 70.00 I think. Share this post Link to post Share on other sites
