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View Full Version : Unit, Pre-Unit, OIF, T120, Bonneville...



Shameless
01-19-2010, 6:50 PM
...lions, tigers and bears, Oh my! I'm looking at buying a Triumph project but have little to no knowledge about them(leaning mostly to no knowledge). So far I've only tinkered with Factory scoots and need some help from those of you who know the British language to get me on my way.

-Difference between Unit and Pre-Unit? Years?
-Is OIF a Unit Triumph?
-T120, Bonneville?
-Your personal preference?

I've spent time searching the internets but I need simple answers, what to avoid, etc.

CHEN
01-19-2010, 8:02 PM
Unit means the transmission is in the case...pre-unit means they are two separate entities. Transmission in the back , and engine in front of it, kinda like a harley big twin (pre-unit) vs. a sportster (unit). If you're still confused do a google image search.

OIF, just means there isn't a separate oil tank. Instead the downtube/backbone of the frame act as the oil tank.

Lovestory
01-19-2010, 8:05 PM
ok Im in a good mood today

-Difference between Unit and Pre-Unit? pre unit separate gear box from the engine
-Is OIF a Unit Triumph? yes
-T120, Bonneville? yes
-Your personal preference?I like them both, preunit motors are nicer looking

wickedblockhead
01-19-2010, 8:06 PM
OIF bikes tended to crack in the early years. so i would look them over carefully. i have never owned one, but have always heard to steer clear.

Shameless
01-19-2010, 8:47 PM
Thanks guys. Much clearer.

rugburn
01-19-2010, 8:52 PM
http://i80.photobucket.com/albums/j195/bostonjon/bike/DSC01084.jpg
this is a unit oil in frame triumph, t140v Bonneville
http://i80.photobucket.com/albums/j195/bostonjon/77bontri.jpg

-burn

steffan
01-19-2010, 9:54 PM
i am educated in the ways of the brits now. thats a sweet bike. i really need to get a triumph. anyone want to trade for a nightster?

philbey
01-19-2010, 10:15 PM
+1 for pre unit's look the best, I dig em lots.

CHEN
01-19-2010, 10:32 PM
I myself prefer the look of a unit triumph.

Shameless---This is a pre-unit engine
http://farm4.static.flickr.com/3299/3421834691_fec48a3d8a.jpg

wllgmr
01-20-2010, 1:53 PM
pre units are older (pre 62 i think) than units

ridemore16
01-20-2010, 2:03 PM
http://i80.photobucket.com/albums/j195/bostonjon/bike/DSC01084.jpg
this is a unit oil in frame triumph, t140v Bonneville
http://i80.photobucket.com/albums/j195/bostonjon/77bontri.jpg

-burn

awesome work! I'm starting my 72 OIF Bonnie build. Is that a David Bird hardtail? I might have some questions about rear motormounts when my hardtail shows up.

Jashole
01-20-2010, 2:49 PM
fucking dope ass bike! +1 for sure

mplsdave
01-20-2010, 4:11 PM
are the motor mounts on oifs the same as a unit frame.

Tikipunx
01-20-2010, 5:09 PM
awesome work! I'm starting my 72 OIF Bonnie build. Is that a David Bird hardtail? I might have some questions about rear motormounts when my hardtail shows up.

Those are the original motor mounts. The hardtail is a bit of a mystery. I bought it off the guys over at Choppahead and had Dave Huntress (tanksbytigman.com) do the weld. Feel free to hit me with questions and I'll be sure to help out where I can.

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Speedfiend
01-20-2010, 5:35 PM
Some more info for ya,
The Oil In frame models came out in 71. All unit 650/750's have the same engine mounting points(exept the head mount) So, an OIF,71-83, engine will fit a 62-70 frame as well.
Generally OIF's are a little cheaper, so if you find a smokin deal on a 70-something, don't be scared! They still good bikes.