ClaudeMachining Posted December 17, 2019 Report Posted December 17, 2019 Mmmm I’m at 60 psi Usually, you should rebuilt at 100psi ;-)Envoyé de mon SM-G965W en utilisant Tapatalk Quote
Domenick Posted December 17, 2019 Author Report Posted December 17, 2019 So what will cause low PSI on my compression the engine was rebuilt two years ago and sat could it be that the seals are all dried out Quote
kawa110 Posted December 17, 2019 Report Posted December 17, 2019 Could be dry seals, do a leak down test. Sent from my iPhone using Tapatalk Quote
Canadianshee Posted December 17, 2019 Report Posted December 17, 2019 ^^ did you also check the tip on gauge is correct length, need to be close to same length as spark plug. El cheepo compression tester can give false readings. As mention above leak down test, spay soapy water over engine to look for leaks if engine does not hold 6psi for required time. Sent from my LG-H873 using Tapatalk Quote
Domenick Posted December 18, 2019 Author Report Posted December 18, 2019 Not the most expensive compression tester just screws into the spark plug so if I spray soapy water all over the engine to look for leaks do I kick it over to build up pressure. First time having a problem with a rebuilt Like this Quote
375hp banshees Posted December 18, 2019 Report Posted December 18, 2019 No, 2 Completely separate tests. you have to plug your exhaust, plug your intakes & pump up with a pump to test... Do you have access to another compression gauge. I'd start there Sent from my SM-A505U using Tapatalk Quote
Canadianshee Posted December 18, 2019 Report Posted December 18, 2019 If you can try to get a better tester. Fist off build yourself a leak down tester you can get all the stuff at hardware store or buy one from flea bay. You use a bike tire pump to bring pressure up to 6psi and watch gauge to see if leaking. If it drops pressure then spray down engine to look to leaks.Compression test after leak down. A leakdown will help point you in the right direction Sent from my LG-H873 using Tapatalk Quote
Canadianshee Posted December 18, 2019 Report Posted December 18, 2019 Pic of leak down tester. As mentioned above. Exhaust, intakes are plugged with spark plugs fully seated them pressurised.Sent from my LG-H873 using Tapatalk Quote
hoppedupandcutdown Posted December 18, 2019 Report Posted December 18, 2019 5 hours ago, Domenick said: Mmmm I’m at 60 psi Is it a Harbor Freight tester? (They all read 60) Quote
Domenick Posted December 18, 2019 Author Report Posted December 18, 2019 Thank you everyone I am going to take the engine out of the bike this weekend and do the pressure test thank you everyone for your information and guidance I will let you know how I make out. The whole bike is brand new front to back top to bottom left to right wiring carburetors everything I’m hoping that with your information and guiding so I could get this running. Thanks again Quote
375hp banshees Posted December 18, 2019 Report Posted December 18, 2019 Just pull pipes n carbs & test 1stSent from my SM-A505U using Tapatalk Quote
hoppedupandcutdown Posted December 18, 2019 Report Posted December 18, 2019 Yeah, no need to pull it from the frame for simple tests. Quote
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