Question about Triumph Bonneville Motorcycles

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Triumph bonneville t120 1968 low oil pressure problems.recently bought my triumph when i noticed the oil warning light did not come on when ignition was switched on.Bought a new one then it worked,but when the engine was warm the warning light flickered,the last owner said the the engine has been totally rebuilt,some one says the oil pressure should be about 20-25 psi on idle,68-80 0n start up. i used an air pressure gauge from work and it shoewd about 20 psi,now got a proper oil gauge with fitting and checking again.oil is flowing nice back into tank ok. Travelled well over 200miles so the bike seams to be riding ok. just this oil warning light. do i check the pump,if not happy with pressure reading next.

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  • chrisnurney Aug 21, 2009

    Hi Charlie,
    Bought a new oil pressure switch on the net from a Triumph dealer,but before that also tried a switch from my local car spares shop and they both worked. the guy i bought the bike off said he had rebuilt the enging and done 1900 miles on it, i then drove it back upto yorkshire another 170 miles with onley small electrical problems holding me back.

  • Samuel Charles Spriggs May 11, 2010

    Could you please clarify this: "Bought a new one then it worked," A newly rebuilt engine, if done properly, should have excellent oil pressure. Oil pumps usually don't give much trouble. Was this a progessional rebuild job? Charlie

  • Anonymous Mar 22, 2014

    After i picked up my bike i noticed that i had an oil pressure warning blinking on my display... could this be a problem or is it normal? Theres no light blinking just a black oil can sign.

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Several things could be at play: Type or weight of oil, confirm this first. Not to question the rebuild but if not done properly (improper bearing clearances, too large) the oil pressure can be low and perhaps a worn pump too. While I am unfamiliar with the engine and oil pump loaction I'd check it if your able too. You'll probably need a good set of feeler gauges to check this if these clearances are outside of the pumps limits the pump will be less able to create pressure; this is of course more evident when the oil heats up.
Another cheap fix is to use a heavier weight oil.
Hope this might help,
Tom

Posted on Aug 21, 2009

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