seadoo 787 compression test|Squish and compression on 787, Wondering if I need to shave : distributors It depends on the gauge, sometimes they're way off, or not testing right, bring yours and test it. It should be closer to 140-150, as long as both cylinders are close 5-10lbs . No Fatal Model você encontra! Veja acompanhantes verificad.
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I checked compression cold before starting and found it to be 140/~152. I also did not have the throttle wide open when testing. Is this acceptable for a top end rebuild?
It depends on the gauge, sometimes they're way off, or not testing right, bring yours .
I have a 1997 seadoo gtx with the 787 cc engine. it has been running good for me .
The absolutely proper way to check compression is to leave the other plugs . It depends on the gauge, sometimes they're way off, or not testing right, bring yours and test it. It should be closer to 140-150, as long as both cylinders are close 5-10lbs . I have a 1997 seadoo gtx with the 787 cc engine. it has been running good for me all season. I did a compression check on the engine and the cylinder towards the front of the . I have a 1997 Challenger with a 787. I rented a new "OEM" compression tester from Autozone with a 12" hose on the end of it. With both spark plugs off, I measured 85 PSI in .
Sea Doo sets deck height with the crown of the OE pistons out at the edge above the rings at approx. 1mm or .039 below the top of the deck. A number 8 gasket should yield .A seized engine with stuck rings will normally produce more than zero compression. It is likely the schrader valve in the compression tester was sticking. Also, you should test 787's with .
Replaced the starter so I am testing the compression on both cylinders for the 787 rebuild.#seadoo #seadoolife #seadooxp #seadooxp800 #pwc #jetski #jetskilif. The absolutely proper way to check compression is to leave the other plugs in the engine. BUT.. I find that most water craft starters, and batteries aren't working at 100%, so . #2. Re: 97 Seadoo XP 787 compression. Lift the heads off and take a look at pistons, cylinders, heads and gasket condition. if the motor turns over smoothly and crank .
Compression test 96 xp 787cc. 02-25-2010, 07:26 PM. So I decided to test compression on my engine and got 105PSI for the PTO cylinder and 120PSI for the other.The 951 compression is 125 to 135 on a fresh rebuild. All other seadoo 2-strokes should be 145 to 155. To do a compression check: A) do it on a cold engine B) don't put anything down in the cyl's. (Like oil) 1) Remove both plugs, and ground the wires 2) Insert tool 3) Hold throttle open 4) Crank 3 or 4 revolutions. A decent compression tester should be in every ski mechanicals tool box. It is the quickest way to find a cylinder or piston issue. 580-787 seadoo’s are perfect compression at 150 psi and 120 psi they are done. 951 is perfect at 130 and done at 110. Here is some information on compression tests. To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded.
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This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo Boats. 2-Stroke SeaDoo Sport Boat Forum . 717 compression test . I did a quick compression test to see how the motor would fair. I was only getting about 138 on both cylinders. I was hoping for numbers in the 150+ range considering the motor is new. A . I just got around to testing compression on a 96 GTX that Im fixing up for next year. The original owner said it was tested at 155psi. I just recently finished doing the oil lines, fuel lines, and a bunch of random fixes. I finally got a compression tester today and attempted to test compression. I got 73 psi on both cylinders.
Check the ground going to the starter area of the engine too, as it need to have a good connection. If you are in doubt of teh battery have it load tested at like Auto Zone for free. If it has a bad cell or 2, it won't have the amps to turn the engine over. Afer you get it fired up and broke in, do a compression test to have a accurate number.
The Sea-Doo GSX 800 (a.k.a. GSX 787) was a popular 2-seater 2-stroke PWC manufactured from 1996 through 1997. This ski shared its dual-carb Rotax 787 RAVE engine with the lively XP 800 but was built on a more stable platform. If you want to learn all about this popular 2-stroke Sea-Doo, this post is for you.
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This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum . I ran a compression test and was at 115 per cylinder dead even. Did not remember to do this while it is in the WOT position. . Low compression on both engines 787 speedster, only 1 with problems. lithium2g; Nov 28 . Hello everyone Seadoo GSX // 787 1996 (in Europe - sorry for poor English) After assembling revised and honed cylinders, I only achieve a compression of 1.75 bar // 105 PSI on both cylinders. Pistons are new. I did a crush test with solder wire Thickness = . Looking in the manual, I don't see a specific Stator test for the 787 in my 96 GTX. I tested the trigger coil as per book and it is good. I am checking the 3 yellow wires on the other side of the connector at the connector with an ohm meter. I don't have the special test plug. I have an OL on the middle yellow wire. 2-Stroke Sea-Doo PWC Forum . 1997 XP time capsule - please step inside . you mentioned a reed valve service, the 97xp has a 787 engine which wouldn’t have reed valves but a rotary valve, the only 2 stroke Seadoo engine to have reed valves is the 951. . Hopefully the short trip on your last ride wasn’t due to any type of catastrophic .
787 Carb Adjustments/Mods - Updated I know the 787 is quite popular, for just normal use and for racing, ect.. . This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. ACE & 4-Tec Sea-Doo PWC Forum. 4Tec Performance Forum . And I did another compression test today since everyone keep bothering me . Bought the boat last fall. water tested. didn't do compression check. I didn't do a proper winterization, only added anti freeze, didn't fog the engine. At the beginning of the season, the compression was 90/60PSI. With oil added into the cylinder, the compression stays at 110/120PSI now. Hello, I recently purchased a 1999 seadoo challenger 1800 with 787 engines in them. I’m having a few issues with them that I can’t figure out. 1- on one of the motors the compression readings are around 210 on each cylinder. And I’m not sure why that is. I’m no mechanic but that doesn’t seem right lol. Hi I have now done a compression test on the motor 1st time I did it dry connected compression tester and turned the motor over with starter 5 or 6 rotation each time 1st time Cylinder 3 (100 Psi) Cylinder 2 (100 Psi) Cylinder 1 (75 Psi) 2nd time wet put 3 squirts of oil from oil can Cyl 3 (125.
compression test
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum . I've read that you test compression with WOT, but never read anything about doing it with carbs removed. . Now if it is correct 120-125 psi is at the end of the life of a 580-787 engine. Perfect is 150 psi and below . All of the seadoo's with the exception of the 951 do not use a head gasket they use o-rings so you can not buy a thicker head gasket. The typical cause of compression variances during a rebuild is caused by not checking the squish clearance. This is adjusted with thicker or thinner cylinder base gaskets not the head gasket.
In my opinion the 98 speedster is the best jet boat sea doo has made. It has the perfect amount of power. The seating arrangemebt is perfect. I owned one for 4 seasons. It was an absolute blast. Never had a single mechanical problem really. The 787 motors are very tough. With 2 of them, that boat is a beast. Here is some info on doing a compression test. You'll need a compression tester. Go to Auto Zone. I think they sell for like .00. . GSX 787 low compression after rebuilt ottorem1; Mar 17, 2024; 2-Stroke Sea-Doo PWC Forum; Replies 9 Views 551. . 2-Stroke Sea-Doo PWC Forum. Contact us; Terms and rules; i have a 96 xp 787 and just rebuilt the carbs. the reason for the rebuild was a bog when i tried to get going and it just ran like crap lol. but now it backfires through the carb thats closest to the flywheel? it did not backfire before. i have put new spark plugs in checked my carbs again, none of the timing has ever been messed with and compression is good...but when i . This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum . If 951 I read they are less than 717/787 . andrew224 New Member. Oct 24, 2011 . Compression Test how to and 'official' numbers need to be compiled and posted.
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum . Compression Test Question . Mike, I've been doing compression test on several 2 and 4 cycle engines, V-10's down to single cylinders and have never did a WOT type test. I've never heard of that ever explained in my . This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum . Run the test on each cylinder one by one. :!: All the cylinders on an engine should be within ten pounds of each other. . 2004 Sea Doo GTI 720 rebuild compression TOMZILLA; Aug 28, 2024; 2-Stroke Sea-Doo PWC . This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. . What should compression be on a brand new, never fired, rebuilt 951carb engine? I figure this would be a good test to see which of my 4 compression gauges is closest to accurate. garrettb Active Member . All the 787 and smaller engines run 150 psi for . Re: What's a good compression for a 98 Seadoo 787 motor? Original spec at sea level is 155 psi, although for whatever reason, in '97 a few of those 787's read even higher than that. If the motor has Rotax pistons in it, and it blows less than 150 psi at sea level, it has some damage to the clyinder walls, pistons and rings.
This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum . no oil. what engine? 787 perfect compression is 150 make sure you ground the plug wires on the grounding studs . Rrm1387 Active Member . how to compression test seadooer2022; Oct 3, 2024; 2-Stroke Sea-Doo . This site contains eBay affiliate links for which Sea-Doo Forum may be compensated. Sea-Doo PWC. 2-Stroke Sea-Doo PWC Forum. . Upgrade Sea doo Explorer 717 to 787 or larger. Thread starter Armysinger; Start date Aug 11, 2016 . Do a compression test, check to make sure the wear ring is not worn out. Armysinger New Member. Aug 13, .
compression differences on a 1997 787
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seadoo 787 compression test|Squish and compression on 787, Wondering if I need to shave