xs650 compression test|Compression #'s : China The factory manual for the D-model specs compression pressure in a range of 128-156 lbs. for a warm engine spun at 500 rpm. I'd consider 120 an acceptable number on a .
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Once you disassemble most compression testers (or leakdown or any other, for that matter), you'll find a 1/4" NPT connection. Tee that in with a certified gauge, apply .When one conducts a compression test, they would normally have the throttle in .Now save that compression tester and remember to use it each time you re .Apr 2, 2010. #3. Hi Matt, all depends on what your looking for.... Ideally start with a warm engine, both spark pugs removed (though they should be plugged in & grounded to the engine .
When one conducts a compression test, they would normally have the throttle in a wide open position. With our CV carbs, the butterfly may be open but is there sufficient .
The factory manual for the D-model specs compression pressure in a range of 128-156 lbs. for a warm engine spun at 500 rpm. I'd consider 120 an acceptable number on a .Hello, I was wondering the proper way to test engine compression? I checked it with the carbs off and got 150 in each cylinder. Do the carbs need to be installed for a more accurate reading?A compression test won't tell you whether or not your oil rings are bad (they tend to go before the compression rings in these motors). The Hayne's manual says the bike should be at normal operating temperature to test compression. Of course, that isn't possible when the bike is in the state that mine is now. .
Yamaha XS650 Compression Test and confirmatory ride. Nat’s Nackers Yard. 2.56K subscribers. Subscribed. 29. 1.2K views 3 years ago. I am starting to really love this .So I have a 75 xs scored off of cl for a 0 looks to have been sitting awhile (1988 tags) It had one melted coil, so I replaced the point setup with a tci setup and some rebuilt bs34's Some . Now save that compression tester and remember to use it each time you re-check. That way you get more consistent readings using the same gauge and accurately test . The compression test is best done on a warm/hot engine, so ideally the engine should be run before the test. I guess that means oil in the engine Cold engine readings may be lower than when hot.
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I am starting to really love this bike! My 83 is running ok, the right cylinder seems colder and not as hot as the left. I used new jets, 45 and 140 from 650 central-I did a compression test on the right cylinder the one that is running colder than left-I got a consistant 75psi-when I rev'd the engine it . An engine with good compression will not bleed down as much as an engine with low compression. This engine has low compression as tested, so I think the exercise is to try and get a pressure check that is closer to what it is with the engine running, IE with higher revs than you would get with a kick start test on a cold engine.
The factory manual for the D-model specs compression pressure in a range of 128-156 lbs. for a warm engine spun at 500 rpm. I'd consider 120 an acceptable number on a cold engine spun with the kicker or button. If the engine has been out of service for a time it may not develop full compression until a few hundred miles have been put on it. The factory manual for the D-model specs compression pressure in a range of 128-156 lbs. for a warm engine spun at 500 rpm. I'd consider 120 an acceptable number on a cold engine spun with the kicker or button. If the engine has been out of service for a time it may not develop full compression until a few hundred miles have been put on it. first check that valves are set correctly then remove both sparkplugs,(makes it easier to test each side) prop the slides open, throttle butterflies full open (or just remove entire carbs), put on compression guage 3 to 4 kicks to build compression reading or use E-start, anything below 100psi is poor probably won't start 100/120 marginial 120/140 useable 140+ .
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XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going. . you should do a compression test before you do anything else write down the pressure you get from each cylinder and then remove the head if the compression is low, like below 100~125 on both . XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going. . Yes, you need to do a compression test to see how badly worn is the engine top end. Reply. S. savagepb XS650 Member. Messages 5 Reaction score 0 Points 1 Location yukon, oklahoma. Jan 31, 2012 Roughly 200 miles of varoius riding on rebuild and decided to do a compression test. After kicking away with wot both sides hit exactly 150. Lower than I. Forums. New posts Search forums. What's new. . XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site . XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going. It's time to vote for the bikes you want to see in the 2025 XS650 Calendar! . Do a proper compression test. Not a "it feels good BS test".
Never ran hi-test 'ethyl' in your XS650, and never an early model? Oh, those were the days. Good point about the slightly elevated compression pressure at spark event. This higher pressure puts a little more demand on the ignition system, while also improving combustion initiation and propagation. New stock coils, new E3 plugs, new cloth covered spark plug wires, new NGK plug caps, carbs cleaned, cam chain tensioner set as per manual. I have it wired for a kick only. Starter still installed I'm using a different battery and jumping the starter to turn it over. I did a cold compression test and got 105 lbs both cylinders. The buyer's guide I found here advised to walk away from a failed compression test and mentioned it would likely require a top end job worth around 0. That is within my budget and patience level, especially if poor compression means I can get the price down even lower. Is a failed compression test worth the effort in restoring/repairing?
xs650 > > Motorcycle Systems > > Engine > > compression test
proper procedure for a compression test
xsjohn - I have the compression gauge that will bolt right in. Let me make sure I am clear on checking the compression; remove plug(s), insert compression gauge (or thread it in snug), turn engine over 3-5 times. Repeat for other cylinder. Is there a simple guideline for knowing the threshold for "good" compression 140-150 psi. So I just purchased a used 1979 xs650 tonight. When I was going over the bike I conducted a compression test. The left side cylinder had at most 60 psi, and the other side went to 150psi. After testing the left side multiple time I decided to put oil inside and tested again. It read about 90. XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going. . working automatic advance, properly set valves, tight cam chain, carbs in sync and compression test of 125+ psi all makes for an easy starting engine. Any battery will suffer if asked to crank .
Hi, I've done a suggested compression test and need some guidelines to verify against. What are specs and valid compression psi. I've tested both cylinders and below are results of both left and right with a slight diff with left a couple of psi more than the right. Left compression test. XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going. . but I'd first want a compression or leakdown test. Then I'd want to examine the breather itself to check for misassembly letting too much oil out (there's a screen and baffles in there). I guess .
Enjoy XS650.com? Consider making a donation to help support the site. XS650.com receives a small share of sales from some links on this page, but direct donations have a much greater impact on keeping this site going. . Compression test and so. And getting more info .. If there are more things to consider at the tear down As always I pulled plugs and ran a compression test, Left 110 Not great but OK on a bike that hasn't run for a while. Right side 20 pounds, CRAP! I put it on TDC compression stroke for the bad side, zeroed down the air compressor, clipped the chuck on the compression tester hose and slowly added air pressure.
Hello, merry christmas! Right just got better after a year of being sick :( So just came to look at the TX650 '73 I bought months ago, first time I've ever worked on an XS and having only rebuilt one bike before I'm still fairly green at mechanics. Carbs need a clean so doesn't start yet. so ive been having some white smoke issues with the recent 750 kit that i put in. at first i thought it might be due to the valve guides since that was the only thing that wasnt changed. BUT i did a compression test and both cylinders are reading around 110 lbs/sq. in. is .
The compression is obviously a concern, but I'd say that an engine with 100 psi compression will run, ie, its not the low compression that is preventing it from starting. The original engine in my XS 650D had 110 psi in one cylinder and less than 80 psi in the other. It was still a runner when pulled. so compression test said 150 psi per side after 5 kicks, went to 7 kicks and it just kept going up. Got to about 180. So, compression seems good, charge and battery seem good, brand new out of the box carbs and still wet right hand plug and gurgling out of the right exhaust. With a weak looking spark. New to the world of the XS650. Took my '78 on a run of around 120 miles today.Sat at around 55 - 65 for the whole ride. . just below the lower level on the ride which still worries me.I have good compression but to be sure it'll be getting a compression test tomorrow. Reply.
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xs650 compression test|Compression #'s