1975 Triumph t150 Chopper

Discuss and show your current or planned project here.

Moderators: Prof, Chopper Project Moderators

Pedro32
Posts: 5
Joined: Fri Aug 03, 2018 12:56 pm
Location: Karratha
Interests: Playing with and riding motorcycles

1975 Triumph t150 Chopper

Post by Pedro32 » Thu Aug 30, 2018 3:55 am

Hi all, new poster here. I purchased a T150 Chopper and I am looking for some advice on Triumph to Harley steering neck conversion. With a new Attitude springer front end in my possession I now need to work out how to fit it to the T150 frame. After a little research it appears that with the earlier frames there are conversion kits available but with the later frames (post 1970?) or there abouts there are no kits available. Has anyone got any experience in this? I am thinking of turning up a Harley spec steering neck and fitting it to the frame. Any thoughts?

Prof
Founder, Choppers Australia
Posts: 5753
Joined: Sat Oct 22, 2005 3:54 pm
Location: Willunga, South Australia
Contact:

Re: 1975 Triumph t150 Chopper

Post by Prof » Thu Aug 30, 2018 9:16 am

I don't have a triumph steering head here, but a Harley steering head measures 173mm to outer edge of outer bearing cups. If your Triumph steering head is no more than 10mm longer, drop out the DNA headstem and machine up one to match the Triumph. Then use the triumph bearings.

I have also modified a BSA headstem to fit HD brearings . See here...http://www.choppersaustralia.com/forum/ ... =60&t=8391
Triumph may be similar.
Chopit'nrideit... Prof

TriNortchopz
Posts: 48
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: 1975 Triumph t150 Chopper

Post by TriNortchopz » Fri Aug 31, 2018 2:20 am

Does your T150 chopper have the stock frame? The easiest way is like Prof says, which I have done several times on BSA, Triumphs, Norton, Kaw, is find tapered roller bearings from my local bearing supplier that fir the neck, then machine a stem to fit the springer or girder or other frontend. Just need a vernier,dial or digital caliper to measure what you have and find what will fit - even if you have to sleeve the OD of the races.

TriNortchopz
Posts: 48
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: 1975 Triumph t150 Chopper

Post by TriNortchopz » Fri Aug 31, 2018 2:42 am

This forum thread may be of interest:

Thread: Triumph T160 chopper to Bobber build.
http://www.chopcult.com/forum/showthrea ... post756213

Image

El Skitzo
Posts: 727
Joined: Wed Sep 30, 2009 6:40 pm
Location: Perth, WA

Re: 1975 Triumph t150 Chopper

Post by El Skitzo » Fri Aug 31, 2018 9:46 am

A T150 Chopper, that's different!
65 Triumph Chopper (project)

Pedro32
Posts: 5
Joined: Fri Aug 03, 2018 12:56 pm
Location: Karratha
Interests: Playing with and riding motorcycles

Re: 1975 Triumph t150 Chopper

Post by Pedro32 » Fri Aug 31, 2018 10:49 am

Hi Guys thanks for the input. The issue is not with the length of the neck it is the width. The OD of the bearing is 45mm or close to. There is not a 45mm OD with a 1" ID available. The old pin on the Triumph is 3/4" pin. The older frames from what I can gather had a larger diameter neck therefore there is bearings available. I have included the link to a pic of my project below. If anyone has any info it would be greatly appreciated. Nice bike TriNortchopz :) !!

http://a4.pbase.com/g10/07/1351507/2/16 ... DOPc7N.jpg

Prof
Founder, Choppers Australia
Posts: 5753
Joined: Sat Oct 22, 2005 3:54 pm
Location: Willunga, South Australia
Contact:

Re: 1975 Triumph t150 Chopper

Post by Prof » Fri Aug 31, 2018 11:02 am

Just keep the Triumph bearings and machine up a triumph stem to slip into your springer bottom tree.
Chopit'nrideit... Prof

TriNortchopz
Posts: 48
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: 1975 Triumph t150 Chopper

Post by TriNortchopz » Fri Aug 31, 2018 11:43 am

Here you go:

TAPER ROLLER STEERING HEAD BEARING - BSA & TRIUMPH - B25/B50, A75 Rocket 3, TR25SS, TR5T Trophy, 650 Twins, T150/T160 - 97-4031
T150/T160 (1975 onwards Taper roller)
OEM: 97-4031
https://www.britbikes.co.uk/taper-rolle ... 2799-p.asp

I build all my necks from 7/8" material and cut a UNEF (Extra Fine) thread for adjustment nut (crown nut) and lock nut (top nut).

Great lookin' chop! Nice stance.
Those oil lines to the cooler look tight - perhaps remounting your cooler so it is vertical will be enough.

Not sure if you read this, but interesting info:
Triumph Trident
TRIUMPH TRIDENT: AHEAD OF THE CURVE?
The story of the Triumph Trident and her sister-bike, the BSA Rocket 3, is one of the most interesting, and at the same time most exasperating, tales in all the annals of Classic British Motorcycles. Interesting because the Triumph Trident might actually have been one of the few instances in which Triumph's parent company, BSA, could have actually been ahead of the curve with its planning...
http://www.classic-british-motorcycles. ... ident.html

Pedro32
Posts: 5
Joined: Fri Aug 03, 2018 12:56 pm
Location: Karratha
Interests: Playing with and riding motorcycles

Re: 1975 Triumph t150 Chopper

Post by Pedro32 » Fri Aug 31, 2018 12:06 pm

When you say “stem” is that the pin? Machining is not my specialty but I think you are saying get a pin machined to 3/4 like the original and an adjuster (under the top tree) and a nut to suit.

TriNortchopz
Posts: 48
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: 1975 Triumph t150 Chopper

Post by TriNortchopz » Fri Aug 31, 2018 2:19 pm

Check this thread:
Thread: Custom steering stem
http://www.chopcult.com/forum/showthread.php?t=51455

Pedro32
Posts: 5
Joined: Fri Aug 03, 2018 12:56 pm
Location: Karratha
Interests: Playing with and riding motorcycles

Re: 1975 Triumph t150 Chopper

Post by Pedro32 » Fri Aug 31, 2018 3:23 pm

Thanks for that I understand. Because the ID of the original bearings is smaller I couldn’t use the original adjuster and top nut but I’d have to get them made and chromed. I’m thinking if I replaced the whole neck I can play with rake and use the Harley internal steering stop. The springer front is +4 over. I’m just a little worried about heat when welding on. I would be using a tig welder.

TriNortchopz
Posts: 48
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: 1975 Triumph t150 Chopper

Post by TriNortchopz » Fri Aug 31, 2018 3:57 pm

Are there any numbers on the neck needed for registration?
I still think you can use the original bearings - what is the ID? - and build a neck post to suit them.
I have researched bearing catalogs extensively to get what I needed - to fit a girder on my rigid T120, I had a sleeve machined to fit around the outer bearing race to fit inside the neck; to fit a girder on my Norton rigid chop, I found tapered bearings with 7/8" id and machined a neck post to fit. Sometimes you can use different cones with different cups - a popular mod to fit a springer on XS650s is to order the bearing kits and buy tapered bearings that are made for homemade utility trailers - they are 1" id, and fit them together.

For welding with TIG, here are a couple of threads to read:

Street Chopper
TIG Welding Steel 101
01. Motorcycle frames are a perfect thing for TIG welding! When I hardtailed my swingarm Shovelhead frame with the back section of a Knucklehead frame I chose to TIG weld the joints because I wanted it to not only look good, but be strong and I wanted a low-profile weld that didn't require grinding (the frame has been sanded with 80-grit on a DA sander)...
https://www.streetchopperweb.com/tech-t ... 01#page-14

Selecting MIG and TIG for Tube Welding: The Foundation for Building a Motorcycle
At the core of any custom motorcycle project is the welding process used to join the tubing that makes up the bike's frame. This article will discuss how both MIG and TIG welding fit into this process and how even a novice welder can get started.
(As seen in the Welding Journal, October 2005)
...
https://www.millerwelds.com/resources/a ... motorcycle

TriNortchopz
Posts: 48
Joined: Sat Feb 24, 2018 5:41 pm
Location: Haines Junction,Yukon, Canada
Interests: Choppers, nature, learning more about choppers

Re: 1975 Triumph t150 Chopper

Post by TriNortchopz » Fri Aug 31, 2018 4:22 pm

Check this out:

British Standard Triumph Harley Neck Bearing Conversion - Fit a HD or Springer front end to your Triumph
and the comment from one buyer:
" Triumph/Harley Neck Bearing Conversion Kit
Timken bearings, great quality, worked perfectly. Mated a Harley Pan Head Springer front end to a T150 Triumph Trident frame.
https://www.lowbrowcustoms.com/british- ... mph-1.html

Have you compared bearing dimensions for your T150 and earlier T120s ('56-'70)? What about the '68-'74 T150s and the '75 T150?

and

Triumph - Harley 1" Springer Front End Neck Bearing Conversion Kit
Looking to install a Harley Davidson or Springer front end to your vintage Triumph motorcycle? If so you are in luck! This new tapered neck bearing conversion set will allow you to install a 1" front end on your vintage Triumph motorcycle. That means you can run a Harley front end, Sportster, or a Springer front end - Comes with everything you need to make the conversion quick, easy and simple.
Fits all Triumph 650 unit twins (T120, T120TT, TR6C, TR6SS, 6T, etc) from 1963-1970. Fits Triumph 350 & 500 unit twins (Daytona, T90, T100C, etc) from 1967-1974 only. Fits Triumph Triple T150 from 1968-1974. Fits the BSA Rocket III from 1969-1971. Also fits Triumph Pre-Unit twins from 1955-1962.
https://www.classicbritishspares.com/pr ... ersion-kit

"

Prof
Founder, Choppers Australia
Posts: 5753
Joined: Sat Oct 22, 2005 3:54 pm
Location: Willunga, South Australia
Contact:

Re: 1975 Triumph t150 Chopper

Post by Prof » Fri Aug 31, 2018 9:07 pm

i particularly enjoyed and recommend the miller welding link. Good info, thankyou.
Chopit'nrideit... Prof

Pedro32
Posts: 5
Joined: Fri Aug 03, 2018 12:56 pm
Location: Karratha
Interests: Playing with and riding motorcycles

Re: 1975 Triumph t150 Chopper

Post by Pedro32 » Sat Sep 01, 2018 12:32 pm

They VIN number is on frame. I have researched the conversion kit and the earlier Triumphs (up to 1974) have a larger OD. Thanks for your help. I am away for work atm when I get back I’ll take some measurements and post some pics and see what you think.

Post Reply

Return to “Your Chopper Project... with photos...”