Question about 1985 Yamaha XJ 900 F

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I am not getting any compression from the engine and exhaust as I try to start it

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If you not getting compression you might have to replace the piston rings which means a top end rebuild

Posted on Mar 24, 2011


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What causes the mower tostop turning at the compression stroke and burn up the solenoid when trying to start it?

If it is a overhead valve engine check the exhaust valve clearance setting. If this is to loose it will not allow the compression release to work properly . The compression release is a part mounted on the cam shaft that when not turning fast it holds the exhaust valve open slightly to allow it to spin easy once it starts and the rpms speed up it rolls out of the way and the valves work normally.

May 16, 2016 | Garden

1 Answer

Have a 1995 suzuki sidekick that will not start. It gets fire and I have tried starting fluid in the throttle body and nothing. I just put a new exhaust system on it. Before I drove it to town then on way...

the G16 engines all need a cam belt every 60k or will do that like clock work, G16B MPI 4 injector or G16A, TBI ,one injector engine.?????????????????????????????????????????????

compression is not OK, it\'s 150psi or more.

is it? good?, and to run a 4 banger, all 4 need to work. think, 4 engines.

sure the cat broke up, that can clog some mufflers. and cause huge back pressure. (the engine pumps air, if you put a stopper in the exhaust the AIR PUMP DIES)

all engines.

its an old car.

i cant tell you what order to do things.

but my tool box is full of tools , is yours?

the cat back pressure check at the 02 is 2 psi or less at 2500 rpm, but yours dont start, so dropping the exhaust solves that.

i just rack back the exhaust manifold on the bolts/studs.

mr, Otto cycle engine is not new ,nor has it changed.

it still plays by the book , compresson, spark, fuel, in that order.

so compress x4 is what tested sparks out, WIDEOPEN throttle

80psi is common reading x4 (dont be lazy do all 4 )

80 is retarded cam, timing belt never ever serviced, and is now slipped. or heck busted

150+ is good

next is SPARK got spark on all 4?

all are dead, or #1 timing is way retared see slipped belt.

ok spark is good, and timing set.

so it runs on test fuel.

yes, , ok yes, IT WILL.

now we work fueling LAST.

cant burn fuel with no compression or timed correctly

no tools? , all is lost.

no tools , no joy.

(that means basic, meters and gauges, i assume every mech has wrenches, its a given)

Jul 13, 2014 | 1995 Suzuki Sidekick

3 Answers

I bought a 1984 chevy 350 engine from a salvage yard that ran but never ran right. Come to find out it had a bad exhaust valve. we took the head off blew it out and replaced the valve and put the head back...

If you have a weak spark it will not start since under compression it takes a much stronger spark to jump the gap as compared to a spark in normal air pressure. Try a good known working coil.

Mar 29, 2017 | 1985 Chevrolet El Camino

1 Answer

05 ford f-650 with 6.0L deseil, will not start. checked glow plugs, fuel, all it does is crank, and no start. help

if the engine will crank and not start, look at the exhaust while the engine is cranking. if you do not see black smoke from the exhaust pipe the engine is not getting fuel. this would be an issue with the injection pump. if there is smoke the no start is most likey a compression problem. diesel requires heat and compression to fire.

Jul 26, 2011 | Ford F-450 Cars & Trucks

1 Answer

18 hp vanguard 165lbs and 180 lbs compression have to hand turn engine past compression or starter wont turn engine over

if its hard to get the engine to turn past the compression release then pull your valve coversand try setting your valve lash
.006 on intake
.008 on exhaust

Oct 25, 2010 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

My Dodge Caravan 1998, was running good, i parked the van for 25 minutes, When came back, don't wanted start. I already change the gas pump, the battery, crank sensor, spark plugs... What can i do now?

You need to do some analysis. An engine requires fuel and compression to start and run. If there is no compression, the sound of the cranking is very different. Since you did not mention that, I suspect that is not an issue.

Smell the exhaust pipe, then crank for a while. Smell the exhaust pipe again to see if there is a gasoline smell. (Don't put your head near the exhaust while cranking; if the engine happens to light off, or even if it just gets a little flame into the exhaust, you can be injured by the exhaust.)

If there is no increase in gasoline smell, you probably are not getting and fuel to the engine. You can try, in that case, spraying some starting fluid into the intake to see if that cause the engine to start briefly. If it does, you know for sure that the mechanical and the electrical aspects of the engine are functioning.

Pull a park plug out of the engine, put the plug back into the boot at the end of the plug wire, lay it on the metal of the engine. Then have one person crank the engine, and check to see if there is a stout spark in the gap of that plug. If not, you have an ignition problem: Bad coil, connection has fallen off the coil, bad ignition switch, etc.

One thing that can cause this kind of abrupt, complete failure is for the timing belt to break. If your engine has a timing belt, visually establish that it is going around with the engine.

Mar 07, 2010 | 1998 Dodge Caravan

3 Answers

I have a jinlun sports scooter i started it up and a bang come out of the exhaust and now there is a hole in the exhaust pipe and it wont start what is the problem can you please help?

sounds like you had a lot of unburnt fuel in the cylinder or pipe. You first need to check you have a spark at the spark plug by removing it placing it connected to its HT lead so that the outer edge (screw threads) is against the engine, keeping yourself clear of it turn the engine over and look for a spark.
Fix the exhaust it needs to be right for the engine to run.
Are you getting fuel? look to see if the spark plug is wet after trying to turn it over.
Check the timing it might be out causing all that unburnt fuel to end up where it did in the first place.
Your engine might be damaged so get it compression tested.

Jan 04, 2010 | 2004 Skyteam ST 125-3

2 Answers

Engine runs but has steam coming out of exhaust pipe

The ONLY way coolant can get into the crankcase is through a crack in the cylinder head, block, or head gasket. THE ONLY WAY!.

Checking compression was a good idea, and you've confirmed that is not where the leak is. It could be somewhere else within a head, the block, or head gasket.

Any gasoline engine will blow steam from the exhaust pipe on start-up and a few minutes running. May even stink, depending on how sensitive your nose is to smell.

I think your going to have to dig deeper into this, if you truly had coolant in the oil. But to tell you exactly where to look is not going to be easy.

Jan 22, 2009 | 1986 Mazda 626 Coupe

1 Answer

Not starting......

If the above information is correct.
1. Good Compression
2. Good Spark & Proper timing
3. Good fuel Pressure, injector pulse , injector spray, & fuel quality( no t contiminated)
4. Proper & clear air intake into engine
Then the likely cause would be a restricted exhaust. disconnect the exhaust at the manifold, and retry starting engine. keep me posted, we will make her run!

Jan 13, 2009 | 1994 Mazda MX-3

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