chessy Posted June 25, 2022 Report Share Posted June 25, 2022 (edited) does anyone here know what compression should be on a 2021 mercury pro kicker 4 stroke carbarator . I can't find specks on this Edited June 25, 2022 by chessy Link to comment Share on other sites More sharing options...
glen Posted June 25, 2022 Report Share Posted June 25, 2022 I don’t know. but it should be similar to any other engine. what reading are you getting? Link to comment Share on other sites More sharing options...
Fisherman Posted June 25, 2022 Report Share Posted June 25, 2022 Found this on Walleye Central, I have problems believing it though. Good results for Four-Strokes should be 180-210 PSI, and Two-Strokes should be around 110-130 PSI. Link to comment Share on other sites More sharing options...
Terry Posted June 25, 2022 Report Share Posted June 25, 2022 Yeah I think 180 is a great number for a 4stroke. But if both cylinders are the same 125 or more it would still be an ok motor Link to comment Share on other sites More sharing options...
chessy Posted June 26, 2022 Author Report Share Posted June 26, 2022 19 hours ago, Terry said: Yeah I think 180 is a great number for a 4stroke. But if both cylinders are the same 125 or more it would still be an ok motor the dealer is getting 115 and 121 on a 2021 with 20 hours on it ruffly ... there is a long story behind this motor... Link to comment Share on other sites More sharing options...
Terry Posted June 26, 2022 Report Share Posted June 26, 2022 It’s not a good motor anymore needs work Link to comment Share on other sites More sharing options...
chessy Posted June 26, 2022 Author Report Share Posted June 26, 2022 7 minutes ago, Terry said: It’s not a good motor anymore needs work that's what dealer is saying but Mercury says not till below 60.... I think mercury is trying to see if it goes after warrantee ... I will no more on Monday afternoon.... ps this thing has already had 4 carbs on it ... and from talking to people I am not even certified to hold a screw driver lol. if carbs sucked air during break-in then that means it ran lean and can burn your pistons ?? Link to comment Share on other sites More sharing options...
Fisherman Posted June 26, 2022 Report Share Posted June 26, 2022 Being a 4 stroke it should still have enough oil lubing it. Burning the top of the piston, entirely possible. Unfortunately it's a Merc and we all know they make good anchors. Link to comment Share on other sites More sharing options...
chessy Posted June 29, 2022 Author Report Share Posted June 29, 2022 On 6/26/2022 at 10:49 AM, Terry said: It’s not a good motor anymore needs work there saying that seeing I have had 4 new carbs that it could be a carbon build up causing low compression ... does this make sense ?? Link to comment Share on other sites More sharing options...
Terry Posted June 29, 2022 Report Share Posted June 29, 2022 Well if carbon builds up on the rings or ring groves it can cause lower compression So it is possible ,but I am no expert. Just been around long enough to have seen a few things Link to comment Share on other sites More sharing options...
glen Posted June 29, 2022 Report Share Posted June 29, 2022 Someone needs to Pull the head and see what’s in there. I hope they fix it for you. Make them. Link to comment Share on other sites More sharing options...
GYPSY400 Posted July 1, 2022 Report Share Posted July 1, 2022 Sounds like a dealer warranty problem to me.. A mercury 4 stroke should run for at least 10 years before even worrying about the compression. Link to comment Share on other sites More sharing options...
ecmilley Posted July 8, 2022 Report Share Posted July 8, 2022 A bad breakin can cause this from ring sticking, need to.verify valve lash before continuing overtight clearances will.cause issues, especially worn Link to comment Share on other sites More sharing options...
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