Triumph Bonneville T140 Compression Test

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Today I am testing the engine compression on my Triumph Bonneville T140. The bike is running fine, but I want to do a baseline test to check the compression is OK and to have some values to compare against in the future.
In this video I demonstrate how to perform a compression test and discuss the results.
The compression results I got were consistent for each cylinder (140psi on each side with the engine hot) which made me think after recording the video that I perhaps need to test the calibration on my pressure gauge, which I have had for quite a few years.
My compression tester is a Sealey CT955:
www.sealey.co....
(This is not an affiliate link and I have no connection to the business)
You can download a number of documents for free from my "Buy Me a Coffee" page - all free with no catches - it is just a convenient place to make downloads available for free (but there is an option to buy me a coffee if you are overwhelmed with gratitude) - including:
T140 service checklist;
T140 torque settings;
T140 parts catalogue
and other items: www.buymeacoff...

Опубликовано:

17 окт 2024

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Комментарии : 9

@colindowd3892 2 года назад

Another great video, clear concise information as always and as the man said its time to ride.

@daveco1270 2 года назад

Maybe I misunderstood you, but why would it spark when you kick it over if the ignition isn't on? I'm assuming there's no reason to have the ignition on. I just did my 1964 Tr6. Compression was around 175 on each cylinder... on a warm bike. I have a 70's Honda CB750 where one cylinder seems a lot lower (like 40 psi less than the other 3) but the bike runs ok. I need to check it again when the bike is warm.

@SongsFromTheSaddle 2 года назад

I didn't really explain the spark issue. You are correct, it should not spark if the ignition is off. My comment (and caution) comes from an incident I had many years ago when working on a 1950s Triumph with no ignition switch. I kicked it over and it jumped a huge spark, causing quite a commotion. I've not had the engine apart on this T140 since I bought it (5 years ago) so I don't know what pistons it's running and how high compression they are. I was really just doing the test as a reference point.

@LobzBKK 2 года назад

great vid ...looking at purchasing a t140

@garywhiteman8798 2 года назад

Another great vid 👍

@SongsFromTheSaddle 2 года назад

Thanks Gary!

@diatonicdoug6525 9 месяцев назад

Shouldn’t be any spark with key off

@philrulon 2 года назад

140 is fine. Both cylinders are the same. Time to go riding.

@SongsFromTheSaddle 2 года назад

Yes, 140 seems good and the bike is running fine, so I'm happy with that. I was really just interested in getting a measurement as I've never tested this bike before.