cb750 compression tester|Compression Test

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You need a warm engine so the cylinders expand, and are oiled to get good seal at the rings. Run the bike to op temps and retest. all cyls within 10% is acceptable. Logged. '78 .CB750 points plates Toyo, Hitachi, Nippon Denso, Futaba. Started by 69cb750. 20 .I will probably cut the axle short, reusing CB750 axle will give me the same axle .Normal Topic Hot Topic (More than 15 replies) Very Hot Topic (More than 25 .

It would be useful to know where you got that compression tester. You generally get exactly what you pay for with diagnostic instruments. The cheapo ones are worth their . I think once you get it running the compression will pick up. It is actually a good thing to get a little oil in the cylinders if the engine has been sitting for a long time. The oil will .

I'm new to the CB750 world and purchased a 81 DOHC CB750F with 31k miles about two weeks ago for 0 with a clean title. I previously finished up building a Ryca Motors bobber based off a 96 Suzuki Savage LS50. . I ran a compression test with out the carbs on and bypassing all the electrical and jumped it from the starter hooked up to my . Hi all, I have a 1979 cb750k that I am rebuilding and have run into a roadblock. I disassembled the head and cylinder due to low compression so piston rings were replaced, new cylinder gasket, new cylinder head gasket, . I ordered a new compression tester that will be here Friday. Hopefully better than the last one. My plan is to get it warm, pull the plugs and do the comp test. Then drain the oil and change while warm. Pull the carbs and test for leaks off the bike while assembled, then pull the bowls and test each float manually to see if they are shutting off.

Today I'll show you the best way to change the oil in your 1st generation Honda CB750K.This process is the same for all 1969-1978 SOHC CB750's.Link to the oi. Hey there lads, I was trying to perform a compression test but noticed that my tester loses compression fast, so I figured my litle screw in did not. Forums. New posts Search forums. . CB750 Addict. Top Contributor. Messages 303 Reaction score 166 Points 43 Location Middle Tennessee, USA.

The leak down test uses oil because it won't go past the rings easily (if at all). Fuel and air will, or would. If the compression tester you have shows better numbers with oil than fuel, that is an indication you have bad rings. But you can't use . Author Topic: need info on doing a compression test on cb750 (engine out of frame) (Read 3849 times) 0 Members and 1 Guest are viewing this topic. crxnug. Full Member; Posts: 53; need info on doing a compression test on cb750 (engine out of frame) 1980 Honda cb750 custom compression test

Choke needs to be open or you are still choking the motor for air when doing the compression test. Like said max compression should be reached in 5 revolutions of the motor. First one will be the biggest jump followed by a couple shorting increases in compression. On a good fresh engine you will reach compression in as little as 3 revolutions. The spark plugs were all clean, and so I figured I should test compression just to check. I mean, it's running so there should be compression but maybe something is up. Now, I used a harbor freight compression tester . CB750 Addict. Messages 153 Reaction score 1 Points 16 Location Weymouth, Dorset, UK, Oct 7, 2017 #15 gbwithacb said: my 1970 honda has not run since 1982,so i started to give the bike a compression test,and the 2 outside cylinders were 50 lbs on one side and 100 on the other side.After taking the tappet covers off on the inside cylinders I discovered .

The leak down test does not use oil. Oil can be used during the compression test to see if it helps the rings seal better. Tablespoon is fine in large car cylinders but it too much for these small motorcycle engines and can indeed give false high readings as the oil takes up space in the cylinder effectivly raising the compression ratio. Hi all, I'm working on a 1982 CB750C, It ran and idled great but would misfire under heavy load. So I just ran a compression test and here are the numbers. Cyl 1: 95 Cyl 2:120 Cyl 3:110 Cyl 4:120 Cyl 1 (when oil added): 110 What do you guys think? The spec lists 170psi +-14 psi. Seems worrying, thanks forBought a compression tester off Amazon to do some diagnostics on the '77 CB750 I recently was given. As a bit of background, I've taken the carbs apart and cleaned them up. Reattached them and was noticing some missing from either cylinder 1 or 2 (bike has 4-2 exhaust so I'm not immediately sure which cylinder), I used an in line spark tester .bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E. bochnak. Enthusiast; . other than that, unless it runs bad or is smoking, who cares about a damn compression tester. Logged If it works good, it looks good. Print; Pages: [1] Go Up

Run a compression test, new engine is around 170 psi and an engine down on squeeze can look rich just like one that has ignition issues to not fire hot. More than one way to be rich, even with lean settings. Less .

1. COMPRESION TOO HIGH? I've just completed a compression test. The engine has new pistons, rings, valves, valve guides, bearings and the head was shaved by 0.06mm by an engineering co. I've reassembled using standard block and head gaskets. I've oiled up the engine and oil pressure is good. On doing the compression test my readings are: No1 220psi The PCS Compression Tester Kit is the best choice for motorcycle, car, and truck owners who need a reliable and versatile tool to diagnose engine issues, thanks to its 8PCS kit that covers a wide range of vehicles and engine types.. As you use this kit, you'll appreciate its high-quality materials and rust-resistant design, ensuring durability and longevity.

Leakdown testers are more for extremely small leaks like on drag racers looking at 5% and less leaking, or nearly perfect. Regular street engines can easily leak more than that making them pretty much useless, a regular compression test works fine for the latter as long as you run more than one test to verify and use a good quality gauge. If the motor is out of the bike, put a 2-wire light on the oil pressure sensor, put a starter in it, and hook up a battery to it. You can see if the engine turns over, and if it does, also give it a compression test and see if it builds oil pressure (the light will go out).I have a 1978 F3 Cb750 with 24,000 Miles on it. The engine turns over and all cylinders have 120 PSI cold compression test except for Cylinder #4 which is about 50 PSI. There is an audible “PFFFT” sound coming from somewhere near it when i have the compression tester hooked up but I can’t quite locate it by ear.

Compression Test woes

It idled without popping or missing on 1&4 with all four under compression, and the compression test showed all cylinders were good. If any of that matters. When you say with all due respect, at some point you should probably mean it.Honda CB750 Compression Test & Motorcycle Clutch Adjustment | Honda Cafe Racer Project Bike | 03In this Honda CB750 Cafe Racer project episode, I am checking. Plan to get one very soon. Accelerator pump is also rebuilt and seems to work fine. i did a compression test but I don’t trust the gauge very much. Cylinders 1-3 showed 95psi and cylinder 4 was at 30.not good. I did a valve lash adjustment and did .

Don't trust the provided harbor junk % gauge. Now Im using the junk 2.0 tool, calculated leakage is 8.3%, 5% so far. The guy who did the review also said the meter was extremely inconsistent and yielded leakage of 30-45% and once he eliminated the factory gauge, he was able to use more pressure, and measured leakage of around 10 % with all the leakage .

Compression Test woes