1970 Bonneville T120R - Triumph Forum: Triumph Rat Motorcycle Forums
Member's Restoration & Rebuild Projects Details of member's own projects.

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post #1 of 14 (permalink) Old 09-04-2019, 12:25 AM Thread Starter
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Main Motorcycle: 2001 Triumph Bonneville
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1970 Bonneville T120R

Recently got a 1970 T120R Bonneville. It's been sitting for 40 years. Mostly there. Rusty and dirty. Owner thought engine was seized but it isn't. Clutch is stuck though.
Got it running briefly.
Plan to make it a rider, Rebuilding carbs. Replacing plugs, points and plug wires.

It needs a few things to make it right. Chain guard, rear frame and grab rail are needed if anyone has parts to sell.

I also got a numbers matching titled frame and engine. Engine turns over. Rear frame has had the battery box mounts removed though.

Should be enough to keep me busy for a while.
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post #2 of 14 (permalink) Old 09-04-2019, 12:58 PM
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Cool ol bonnie. I don't have any parts for you but I look forward to seeing the pics once you get it scrubbed up and running smooth! Good luck!
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post #3 of 14 (permalink) Old 09-04-2019, 11:37 PM
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This will be a GOOD one!

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post #4 of 14 (permalink) Old 09-07-2019, 09:31 AM
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That looks a lot like mine did three months ago, though yours has had some customization somewhere along the way. Definitely a bike that can be put back together right and it looks to be mostly complete. I am confused a little by the pictures because there are some pieces I do not recognize, and some items in a different place, and I am not sure what is under your carbs, or whether those carbs are the same as mine were.

New Amal carbs are not that expensive and I think worth it. Not only are the old ones likely worn out, the new ones are improved in a number of ways, most significantly, they deal with the fact we now have alcohol in gasoline. Make sure you get them jetted for your altitude if you buy them.

My best luck in consistently getting the correct and good quality parts has been Waldridge. Among many other items, I bought a new chain guard from them and I am deciding with my painter/powder coater whether to keep it or fix the old one, so I will let you know about that. A new unpainted chain guard is $187 Can (about $150 US). This stuff adds up.

BTW I have tried a half dozen other suppliers too, and some have better prices on specific items like specialty tools and next day delivery, but you do have to specify the exact part number and if they have a cheap part and a more expensive item available, trust me, you do not want the cheap one. It may be that my recommendation is best for someone who does not have a lot of experience, like me, and it appears you do.

Looks like a great project. I am looking forward to seeing your progress.
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post #5 of 14 (permalink) Old 09-07-2019, 01:08 PM
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that should clean up to be very nice bike - lucky find
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post #6 of 14 (permalink) Old 09-08-2019, 12:06 AM Thread Starter
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Carbs are cleaned and back on. I've attached pictures. Air cleaners are modified to take a 1 inch wide filter. The filter element foam was deteriorated so all that's left is the screen. Screen measures 1 inch wide by 3 1/2 inch diameter. Anybody have a recommendation as to a filter element that will fit or a replacement filter that will clear the oil tank and side cover?
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post #7 of 14 (permalink) Old 09-09-2019, 09:09 AM
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You'll probably have to cut down your own filters, or maybe check EMGO to see if they have 1" wide elements.

Nice oil filter adapter under the carbs, an excellent addition.

I might have a proper rear grab bar to replace the sissy bar. post measurements from shock mount end to fender mount hole...

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post #8 of 14 (permalink) Old 09-09-2019, 03:34 PM Thread Starter
Supersport 400
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Other Motorcycle: 1977 Triumph T140V
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Thanks GrandpaulZ.
I'm going to leave the oil filter on. I tried looking at EMGO for a suitable air filter element but didn't find anything. I think I will have to cut one down.
I have a grab rail coming from Vintage Triumph Supply. They also had the other major parts I wanted used at reasonable prices.
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post #9 of 14 (permalink) Old 09-09-2019, 04:55 PM
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Hi Mike,

Quote:
Originally Posted by MLW9110 View Post
needs a few things to make it right.
rear frame
'68 and '69 650 are the same as '70; T160, T150 and '68-'74 350/500 are basically the same but some brackets are different.

Quote:
Originally Posted by MLW9110 View Post
grab rail
Black-'n'-chrome were peculiar to '70, but not all of 'em, some were all-chrome. Any '73-'75 'dry frame' has the same 7/16" ID gusset holes as '70, '71/'72 'dry frame' is basically the same but has small-ID gusset holes (for reflectors).

Quote:
Originally Posted by MLW9110 View Post
Air cleaners
Screen measures 1 inch wide by 3 1/2 inch diameter.
recommendation as to a filter element that will fit or a replacement filter that will clear the oil tank and side cover?
Try K&N SEARCH BY DIMENSION. Not sure if they still do the element that fitted inside the Triumph chrome bands and end plates but the Amal-replacement Mikuni kits include a "Universal" filter and, as you'll see, there are also ones with offset and cranked outlets.

Hth.

Regards,

Stuart
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post #10 of 14 (permalink) Old 09-09-2019, 08:08 PM Thread Starter
Supersport 400
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Other Motorcycle: 1977 Triumph T140V
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Bike is running today after carbs cleaned, new points, plugs and plug wires. Started easily. Runs smoothly, some smoke but hope that will clear up some after I get bike sorted and ride it a while.
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