• 1971 Oil In Frame Triumph Bonneville Restoration: Tire Choices

    5 monthes ago - By Tim's Motorcycle Diaries

    The old Bonneville needs new tires and inner tubes so I'm wrapping my head around olde fashioned, pre-metric motor-bike tyre sizes. Those would be the Dunlop K70s that came with the Bonnieville back in the day.
    Fortunately Dunlop is still looking after the bike they designed the tire for .
    The '71 Triumph Bonneville came with 3.25 X 19″ front & 4.00 X 18″ rears and used Dunlop K70 tires as standard equipment. It looks like there are modern Dunlop options for vintage SAE wheels at Revco where I've gotten my last two sets of tires. The handy chart below shows metric and imperial conversions...
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  • 1971 Triumph Bonneville Project: Engine Out

    5 monthes ago - By Tim's Motorcycle Diaries

    The weather's all over the place at the beginning of March this year. Last weekend I had both road-ready bikes out for a shakedown , this weekend we're skiing in -20°C windchill; that's the road I was riding on last week. As GP from Hammy Hamster would say, 'the elephants are against us.' With the outside trying to kill us again, I'm focusing on doing a complete tear down of the 1971 Triumph Bonneville project. I was originally going to see if I could get the bike in motion as it is, but a combination of factors including 1971 Triumph build quality and the early 80s muppet who tried and...
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  • 1971 Triumph Bonneville Restoration Project: Frame Breakdown & Rear Brakes

    5 monthes ago - By Tim's Motorcycle Diaries

    I'd initially planned to do a rolling restoration of the 1971 Triumph Bonneville project , but the state of the engine and my desire to get it back to a place where I can enjoy an updated, dependable but mechanically sympathetic restoration (I want the bike to retain its patina, but I also want it to be dependable) made a rolling restoration impractical. The engine is lined up for a new 750cc head and electronic ignition system, but before all of that I have to get the frame and wheels sorted out so that I can put the upgraded engine back into a sorted rolling chassis. To that end, it was...
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  • 1971 Triumph Bonneville: More Bike Archeology from Tires, Wheel Restoration & Rear Brakes

    1971 Triumph Bonneville: More Bike Archeology from Tires, Wheel Restoration & Rear Brakes

    5 monthes ago - By Tim's Motorcycle Diaries

    I got the rear tire off the rim today in the ongoing '71 Bonneville project during a late March snowstorm. It had a Lien Shin tire on it. I'm unfamiliar with that brand and I can't find a heat pressed time stamp on it. Tires produced before the year 2000 use a 3 digit code that makes it difficult to determine which decade they were made in (first two digits are month of manufacture, last digit is the year). Tires after 2000 use a four digit code (week of manufacture followed by a the last two digits of the year, ie: 0501 would be the fifth week of 2001). A 511 would be the 51st week of a...
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  • 1971 Triumph Bonneville T120 Sensible Bodywork Bolt Replacements

    1971 Triumph Bonneville T120 Sensible Bodywork Bolt Replacements

    5 monthes ago - By Tim's Motorcycle Diaries

    I'm in the process or stripping the last bits of hardware from the frame and bodywork in order to clean up and paint the frame and bodywork on the 51 year old Bonneville project bike. The bolts holding the licence plate holder onto the rear fender were 4 different sizes with the longest ones protruding so far toward the wheel that they'd be a safety hazzard on a big bump (the tire would make contact with them on full suspension compression, especially with me on it).
    I was talking to a friend online who made a career out of flying helicopters for the military and he said he's found wrong...
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