Jbeck103 Posted June 18, 2012 Report Posted June 18, 2012 Anyone know about what kinda compression number you should get on the first kick and as a final compression? Quote
Glamis321 Posted June 18, 2012 Report Posted June 18, 2012 Just keep kicking it until the needle stops climbing and use that reading. Heres some numbers i stole from an older thread: .........Sea Level..1000'.2000'.3000'..4000'..5000' 18cc.........197.....178...171...170.....165.....145 19cc.........183.....167...160...158.....152.....137 20cc.........169.....156...149...146.....140.....129 21cc.........156.....145...138...134.....128.....121 stock........130.....125...118...112.....106.....100 Quote
Jbeck103 Posted June 18, 2012 Author Report Posted June 18, 2012 Just keep kicking it until the needle stops climbing and use that reading. Heres some numbers i stole from an older thread: .........Sea Level..1000'.2000'.3000'..4000'..5000' 18cc.........197.....178...171...170.....165.....145 19cc.........183.....167...160...158.....152.....137 20cc.........169.....156...149...146.....140.....129 21cc.........156.....145...138...134.....128.....121 stock........130.....125...118...112.....106.....100 I always thought that first kick should be at least half of your final reading number? my first kick was only 30psi and then it stopped climbing at 110psi. I am just under 1000ft altitude (700-800ish) and wondering if those are good numbers? Quote
Jbeck103 Posted June 19, 2012 Author Report Posted June 19, 2012 (edited) are you holding it wide open when kicking? and 110psi is low might be needed rings soon. Yes that is wide open throttle. I kinda figured it needs a top end rebuild but just wanted to see what other people thought about it. what kinda number do u think i should have? Edited June 19, 2012 by Jbeck103 Quote
Jbeck103 Posted June 19, 2012 Author Report Posted June 19, 2012 depends, you have any porting down? any mods to the head? Everything internal should be stock on it. I bought it 2 years ago not knowing the last time it had a full rebuild done to it or rings for that matter. I am trying to decide whether to throw rings in it and keep running it or just drive it the way it is until winter comes around and then get the cylinders bored and honed, new pistons, wrist pings, and rings. What do you think would be a good idea? Quote
Jbeck103 Posted June 20, 2012 Author Report Posted June 20, 2012 you should be around 125psi. you can still run it till winter time as 110psi isn't omg low but it is lower than what it should be. Pretty new to doing motor diagnosis on 2 stroke engines but doing a leak down test should be the same readings for a 4 stroke as a 2 stroke correct? Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.