morning ogri.......ummmm.....the oil in the bores trick is to check for worn rings,as you probably know.the oil will temporarily seal any gaps between the rings/pistons and bores and give you a higher reading,if theres no change when using oil and you have a low reading the valves are to blame...assuming the head gasket is ok....not got a good screen at home but as i look at your vid do i see a faint plume of smoke or is that my fading eyesight :rolleyes ....whats the reason for you doing a compression test ?
One, is never going to be enough.....
The 20psi change does show a reasonable amount of wear on the bores/rings but not massively so. The 110psi is very low though if the bike isn't smoking or lacking power. I'd check the gauge against another in case its faulty. Also what are the valve clearances like? Too loose or tight will drop the pressure without smoke (power would be down though)
do you know what the cr is for that engine.
yank spec motors tended to have low comp pistons
time to get the syringe out :b
The problem with socialism is that sooner or later you run out of other people's money!
bike on sidestand
no4 plug out and find TDC
fill cylinder with oil to bottom of threads with syringe noting how much you put in.
998/4 + volume of oil/volume of oil...................simples.
remember to suck out the oil afterwards otherwise the motor don't turn over :rolleyes
The problem with socialism is that sooner or later you run out of other people's money!
Aaa I get it...Oakley dokely mate. Found on a website comp ratio is 9.2-1 stock...is that lowish?
Fairly low for 2 star fuel. Compression pressure on a z1 should be 130-160psi.
Assuming the valve clearances are set right:
If its been stood it could just be gummed up rings or even corrosion on the valve seats if it wasn't laid up properly. Take the plugs out and drop a thimble full of diesel down the bores. Just enough to cover the top of the piston. leave it overnight it will act like penetrating oil and hopefully break free the rings if they are stuck. Make sure you spin over the engine to get any left over diesel out before refitting any of the spark plugs. Bare in mind that most of the diesel will end up in the sump so you either do an oil change afterwards or on the cheap just drain the oil into a clean container the pour it back in afterwards.
Run it for a few days at various loads and speeds then do another comp test to see if there's an improvement.
Good advice mate I'll take it..just changed oil and filter for expensive semi synth so I'll drain that off first...
