Question about 1980 Honda CX 500 B

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Compression Issue - I am trying to get a manual that covers repairs of the engine.

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I like to see engines with at least 90 psi per cylinder, over 100 is better.
What is the problem, low power? Could have a bad plug cap.Do both exhaust pipes heat up about the same when you start the bike.
Let me know.

Posted on Sep 23, 2009


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Posted on Jan 02, 2017


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Ford focus broke serpentine belt and I shut it off and I got a new replacement belt put on but now it like its not getting any compression and want start help PLEASE

It is rare a serpentine belt will break as these days they are so tough they will almost last the life of the car. Toothed timing belts sometimes break but mostly the auxilliary belts show visible signs of ageing or damage and are replaced long before there is any danger of breakage. That indicates there was a reason the belt broke that should be investigated.

The breaking of the auxilliary belt might have something to do with the reason for the engine not starting but it seems rather unlikely unless when it left the pulleys at speed it caused some damage to something or you didn't stop immediately and overheating occurred.

If the engine now sounds as though it has no compression it would seem probable it actually has no compression so that is something to check during the back to basics approach to diagnostics along with a physical check of the timing belt and the timing.

Tappet jacking is a fairly rare condition but that sometimes happens and it manifests as a loss of compression due to excessive oil pressure in the hydraulic valve lifters actually lifting the valves from their seats. Usually it is only temporary and happens when the oil pressure relief valve sticks closed.

Good luck!

Jul 29, 2017 | Ford Cars & Trucks

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2002 ford zx2 turn over n won't start

Everyone I know says you need three things to run an engine -
air, fuel, and spark. That is why they are not mechanics. There is a fourth, critical item needed to go with those three to make the internal combustion engine work - and that is compression.
The first, and quickest check the help isolate cause of a no-start condition, is a can of starter fluid. Get one and remove the cover to the throttle body (never spray starting fluid through the intake hose as it can damage MAF sensors!). Have a friend crank the engine and spray some fluid into the throttle body. If the engine fires up, stop and let it stall out. You now know that you have compression and spark. Your problem is lack of fuel, and that most likely is the fuel pump. If it doesn't fire, you can rule fuel out as the problem as fuel itself won't solve the issue. You must first check for compression. The first thing I always check for regarding compression on a no-start condition is the timing belt, if the car has a belt rather than a chain (you have a belt). This is because most owners don't read their manuals, don't check the maintenance requirements, and thus don't service their car as recommended by the manufacturer. Additionally, timing belt replacement is rather costly and easy to procrastinate away for as long as possible.
There are two ways to determine a timing belt issue. The first is the cranking speed of the engine. If the engine seems to crank over much faster than it usually does, then there is a good chance the belt has broken, since the extra load of the cam is not being felt by the starter. If that is not obvious, try to see the cam gears or shaft while cranking the engine. Some cars have a pop-off inspection hole over the cam covers for this. On some cars, you can see the camshaft if you look into the oil filler cap hole. If the camshaft is not turning when the starter is cranking, the timing belt is toast. Even if the shafts turn, the belt may still be suspect. They can shear teeth and jump time. So the next check would be a compression test of the cylinders. An out-of-time engine will have piston and valves out of sync, resulting in poor or no compression. Add to the fact that your engine is known as an interference engine, and if the belt breaks or strips, you will sustain internal engine damage that must be repaired before you can run the vehicle again (another reason for scheduled maintenance!). If all this checks out, then the next item to check for would be fuel (unless you rules that out earlier). In a quiet location, sit with the car door open and place the key in the ignition, and turn it to the RUN, not START position, and listen for a buzzing or humming noise coming from under the rear of the vehicle. It should last from 3-10 seconds. If so, you have a fuel pump that works. This sound is the priming, or pressurization, of the fuel system prior to starting. There still could be fuel issues, but the pump is by far the biggest suspect. The last item is spark. This is the hardest one to troubleshoot, since you can't see electricity. There are crank and cam sensors, as well as the ECM itself involved in the spark issue. You may decide at this point it is cheaper to have a mechanic look for this problem since parts swapping to easter-egg a spark issue can start getting costly.

Dec 06, 2016 | Ford Cars & Trucks

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Holden GM 3.6 SIDI which has no compression in number 4 cylinder? mechanic thinks it is a stuck Valve. Can youdiagnose? Thanks and is it an expensive repair. Any tips to help it unstick. Cheers Mate.

Hi do you know history of vehicle ? Has it had regular oil changes through out it's life, these engines do sludge up if not looked after. Try wet compression test 1st then rocker cover requires removal for no 4 cyl for diagnosis. 1st.Check for sludging , broken valve spring, or any other issues for no 4cyl. If sludging is pressent my advise is unless complete engine strip down and rebuild is carried out do not carry out repair. Chances are it wont last long. These engines completely rely on good oil circulation. A new engine or second hand engine would be advisable. If second hand remove a rocker cover and check for sludging before fitting. Also ensure the engine is correct for your vehicle or you may have ECU issues. In other words engine has to be removed again. Good luck.

Nov 01, 2016 | Holden Cars & Trucks

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My kx125, can still start it and ride it without a lot of compression, it only gets compression about half way towards the bottom when kicking it, but it does start.. Any ideas??

Hi, Colin you may have a kicking gear engagement issue, do a compression test when the engine is at operating temperature should be around 125-130 psi. for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Minimum Compression Required
Curing 2 cycle engine problems
Small Engine Repair Compression Test on 2 Stroke Craftsman Chainsaw

Mar 26, 2016 | 2003 kawasaki KX 125

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15 hp evenrude he ran with bad impeller it overheted then shutdown i replaced impeller but it wont start. any suggestions???

an overheated engine will soften the rings so that the compression fails and may have damaged the reed valves that facilitate the compression
if it is a 4 stroke then there could be piston damage as well
If you do not have a workshop manual or are not mechanically conversant with engine repair then I recommend that you take it to an evenrude service dealer for diagnosis and repairs as there is a safety issue here

Sep 04, 2015 | Cars & Trucks

2 Answers

How to fix my ford ganger 2001 v6 3 o l I have low comprecion cylinder number 2

Well, there are a few causes for low compression....bent valve, broken rings, worn cylinder, broken/ chipped valve, blown head gasket, cracked head, cracked block/ cylinder, broken/ cracked you can tell, none of which are good and always means going into the engine to repair. A lot of times it is quicker, cheaper, and easier to exchange the engine for either a remanufactured or good salvage yard engine.

Sep 26, 2014 | Cars & Trucks

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I have a craftsman 358.796354 hedge trimmer that will start on full choke, throttle in the start position. But, as I move the choke from full it will rev up then stall. The only way I can get it to "r

It sounds like more of a carburetor issue but out of curiosity did they say why they thought it was a compression issue? Although craftsman is a little high on their parts a lot of the aftermarket parts such as a carburetor a lot of times are not all that expensive. I can't imagine you'd have all that many hours on it unless you use it commercially to warrant a compression issue. Might be worth a try.

Apr 14, 2013 | Craftsman 22" Gas Hedge Trimmer

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The engine was to much compreshin when you try to crank the starter makes a funny sound and does not kick over but when you take off the the cover to thers no compreshen it spins

There cannot be to much compression only weak battery charge battery or replace battery see what happens I not hundred percent but I would assume your cams have Auto de compression fitted to them so compression should never be the issue

May 22, 2011 | 2003 Honda CBR 600 RR

2 Answers

Which Mazda diesel engine do I have? RF, RF-CX or RF-N

The engine is a RF- CX the CX denotes comprex pressure wave supercgarger

Jun 14, 2009 | 1988 Mazda 626 Turbo

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