09/16/2026
We have three classic trials engines on a shelf, figured we should weigh them before we start the builds, or pilfering them for parts.
1966 Triumph T100C
1977 Yamaha TY 250
1961 Triumph Cub T20SS
First, the mighty Triumph 500 Twin. Specifically 1966 T100C stock trim. Thing is heavy! And yes, most of the oil has seeped out.
Sure will make a fun bike👍🏻 What’s the best trials frame for a 500 “pre-‘65” build? We saw a CZ frame with a Triumph engine in it used for MX, that was interesting.
104.4 lbs. Ha! What a pig. So to compete with the weight of a modern trials bike that gives us about 60lbs to work with for a frame, tank, wheels, rims… 🥴🤣
Now onto the 1977 TY 250. Magnesium case covers (stock) and removed oil injection (shoulda been stock- I’ve never seen a TY riding a trial with the oil injection still functioning in the bike).
66.8 lbs. Hmmmm, how does this compare to a modern Beta or TRS engine?
And now the cubby. This is a spare engine 1961 T20SS. Other than some creative “mods” to the transmission (removing the teeth from 4th gear) seems to be mostly in standard trim. What do you think, heavier or lighter than the TY 250?
50.4 lbs!!! I’m going to venture a guess… I bet this Cub engine is lighter than the Montesa 260. Someone please weigh your modern Montesa engine, we really want to know.
