Featured 1970 T120r Sweaty And Dirty But Perfect.

Discussion in 'Bonneville' started by Russell Stroup, Jul 1, 2021.

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  1. Russell Stroup

    Russell Stroup Noble Member

    Nov 10, 2020
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    #41 Russell Stroup, Jul 18, 2022
    Last edited: Jul 19, 2022
    It’s been awhile since I gave any updates on the 1970 T120r. I got it out of my parents barn, brought it to my place and am planning on working on it over the winter. My previous post shows a 1974 Honda cb360 which was my first bike. Before and after pics, I did all the work myself except syncing the carbs. I do have some skills but not like some of you on the forum, who amaze me with what you can do and how fast you get it done.
    The motor on the Bonnie is locked up. After a “couple” of beers the neighbor and I removed the stator cover off and tried turning the motor that way, and it’s not budging. My question is, having never taken on anything like rebuilding a motor. Is it do-able for a person with limited skills. The tasks accomplished on the cb360 included rebuilding carbs, clutch, front forks, etc. Basically everything but the motor.
    Would buying a 750 barrel and pistons make it easier for me to do myself? Lots more questions but we’ll leave with that for now. THX
     
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  2. darkman

    darkman Crème de la Crème

    Oct 26, 2015
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    The Triumph twin engines are very simple from a stripping and rebuilding point. There are many online videos showing what to do and providing you have a good set of spanners and sockets etc you only req only a few specialist pullers for clutch and crank gears/bearings etc, piston ring compressors, valve spring compressor and crankcase splitter/puller is also helpful but not nessacery. A good local engineering company can be useful for any engineering/machining work you can't do or removing refitting any bearings etc if you get stuck with.
     
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  3. Russell Stroup

    Russell Stroup Noble Member

    Nov 10, 2020
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    D9E2B9C6-5448-4B60-B035-25FA74816519.jpeg Finally getting some time to work on the 70 Bonnie. Looks like water damage ruined the stator and alternator.
    I’ve been hoarding parts over the past couple of months, looking forward to working on this over the winter. Will post updates.
     
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  4. darkman

    darkman Crème de la Crème

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    That's nasty.
     
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  5. Iron

    Iron Elite Member

    Dec 29, 2021
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    Blimey, just a small electrical issue :neutral:
     
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  6. Russell Stroup

    Russell Stroup Noble Member

    Nov 10, 2020
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    Update on the 70 Bonneville. Engine out, wiring harness etc. off, will bag and tag tomorrow. Still leaning towards refurbish over restore. New wiring harness, I don’t think Triumph used lamp wire on the original lol. I do have proper rims, used but in better shape than the ones on it. Not sure about that yet. Scouring eBay for nuts and bolts/hardware to replace rusted with “used”. I want it to look used, not neglected. FEE28A98-BF20-4371-9201-84D01F9A846E.jpeg 3551A050-1D55-43D1-A689-3FAC8A8AA7B6.jpeg BA20EDDE-1872-4BBB-BB08-1E30C2B31BA3.jpeg 71EF8D0E-A021-4859-B98A-247FC084C188.jpeg 1A21E206-04B3-4FE7-9298-3966B71F1C06.jpeg BE736C21-5702-4DB0-BAB8-FAEFEC01BA0D.jpeg
     
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  7. Russell Stroup

    Russell Stroup Noble Member

    Nov 10, 2020
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    Oh ya, forgot, last pic is my old school wood/coal stove I heat my man cave with. I would sleep out here if I was allowed to : )
     
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  8. darkman

    darkman Crème de la Crème

    Oct 26, 2015
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    Great to see some progress :)
     
  9. speedrattle

    speedrattle Senior Member

    Feb 19, 2021
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    the 1970 will use standard SAE nits and bolts. if you want the original UNF O-O marks youll have to look harder, but sizes and thread forms are esy to match.
     
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  10. Russell Stroup

    Russell Stroup Noble Member

    Nov 10, 2020
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    #50 Russell Stroup, Dec 30, 2022
    Last edited: Dec 30, 2022
    Ya, I bought WW wrenches and sockets thinking I needed them. I haven’t even gotten them dirty. :)
    I do have a question. I couldn’t get the motor to turn over to check compression because the stator and rotor were rusted together. It looks like a top end was done previously. The pistons are +.40 the cylinders are really nice. Can I just get new rings? I’m planning on full tear down to do bearings and sludge trap, would be nice to save some money if I could. THX
     
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