Compression testing

Whoah that's low....

Teaspoon of oil into each bore, re do the tests, if the pressure comes up then it's possibly rings

If it stays the same then I'd say valves or head gasket

Don't think the plug all out would make any difference

 

Hi clarkey, jody is right on the money. Low readings there ! All plugs should be out for compression tests.. How long has engine been stationary. ie no use at all ? If its been a long time then rings maybe stuck in pistons ! Do as Jody suggests put very light oil in each cylinder but. wind/turn it over for 20 sec bursts to try springing the rings loose, do this a few time's. Even to the degree that battery requires charging ! Oh is starter motor and battery healthy ? As slow turnover can give somewhat lower readings !! Bad starter motor brushes or flatish battery can be cause.

Hope to hear good things in the future. Good luck. If turning motor over repeatedly/faster lifts readings then all may come good with new oil and running the motor !

Cheers capt.

 

Hi clarkey, that doesn't sound too bad, I'd suspect sticking rings or was it turning over slowly ? 33,000 is very low milage to be giving that low a reading ! I had 94 trident that I owned for 6 yrs had 100,000 miles on it and compression was higher than the manual stated as the norm ! By about 5 psi !!

 

Clarkey,

Compression should be 140 to 165 psi , different cam profiles for different motor performance values, the Daytona motor has the most aggressive valve timing of the T300 range Triumphs, so those readings aren't bad enough on their own to justify strip down some further investigation me thinks.. !

 

Hi clarkey,

Would be good to run it for a while, with new oils and filter , I would suggest a good semi or fully synthetic oil as these have good cleaning agents/qualities. Do as many miles and varied types of ride as you can fit into your project schedule. If you do decide to go for a rebuild, new rings etc have a look @ porting the head, even a light clean up of the inlet and exhaust tracts can have as much as 2 or 3 HP gained ! I did my Ports on an 08 America, breathes much better!

 

Just went back and looked @ before and after oil dropped into cylinder's, without oil looked low but even across all cylinders, with oil maybe bit much oil in centre giving the much greater rise ? Did you get any idea on how the previous owner rode it ? Did he baby it ? Ride very conservatively ? Might explain low pressures, as you would expect low readings for cold engine without carburetors installed.