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1978 Triumph Bonneville project

This is a discussion on 1978 Triumph Bonneville project within the Project Builds forums, part of the Caferacer.net Forums category; Took the primary cover off yesterday and found this, not good news....

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Thread: 1978 Triumph Bonneville project

  1. #51
    Senior Member steveo's Avatar
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    Took the primary cover off yesterday and found this, not good news.
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    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  2. #52
    Senior Member Teazer's Avatar
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    Primary chain roller perhaps?

  3. #53
    Senior Member steveo's Avatar
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    Quote Originally Posted by Teazer View Post
    Primary chain roller perhaps?
    Bang on Teazer.
    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

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  5. #54
    Senior Member Cyorg's Avatar
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    Which suggests it was a split roller chain. Better to spend a little more and get a solid roller chain.
    "Non urinat in ventum"

  6. #55
    Senior Member steveo's Avatar
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    Quote Originally Posted by Cyorg View Post
    Which suggests it was a split roller chain. Better to spend a little more and get a solid roller chain.
    Certainly looks that way Cyorg, seems to be easier said than done to confirm which brand of chain has soild rollers.
    The Reynolds one is the most expensive, so that might be the one to go for.
    Really not looking forward to removing the alternator and clutch.
    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  7. #56
    Senior Member Cyorg's Avatar
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    Quote Originally Posted by steveo View Post
    Certainly looks that way Cyorg, seems to be easier said than done to confirm which brand of chain has soild rollers.
    The Reynolds one is the most expensive, so that might be the one to go for.
    Really not looking forward to removing the alternator and clutch.
    Well if you lived closer you could borrow the box of Triumph tools I have. Years ago a fellow I know was at one time a triumph dealer. When he was getting out of it, I made the mistake of asking him how much he wanted for all the parts and tools. Although... sold most of the parts except things like followers with the “R” stamped into them and made a few $ plus kept the tools. Anyway.... I would try and either buy the chain from someone reputable who guarantees its solid roller, or be able to inspect it first. I recently bought some chain and based on the brand, assumed it was a safe bet. Not so.. I can still use it because the engine doesn’t produce enough power to pull the skin off a rice pudding.. just have to keep an eye on it and replace it sooner. Secondary drive to easy to inspect.
    "Non urinat in ventum"

  8. #57
    Senior Member steveo's Avatar
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    Quote Originally Posted by Cyorg View Post
    Well if you lived closer you could borrow the box of Triumph tools I have. Years ago a fellow I know was at one time a triumph dealer. When he was getting out of it, I made the mistake of asking him how much he wanted for all the parts and tools. Although... sold most of the parts except things like followers with the “R” stamped into them and made a few $ plus kept the tools. Anyway.... I would try and either buy the chain from someone reputable who guarantees its solid roller, or be able to inspect it first. I recently bought some chain and based on the brand, assumed it was a safe bet. Not so.. I can still use it because the engine doesn’t produce enough power to pull the skin off a rice pudding.. just have to keep an eye on it and replace it sooner. Secondary drive to easy to inspect.
    Just spoke to FD Motorcycles in Gt Dunmow, he said the Reynolds chain is a solid roller and he sells it for £60, so I'll go for that.
    You'd think it would be fairly straight forward to buy a new wiring harness. I ordered a 1974-78 one from ebay this week which turned up yesterday. Unfortunately a good few of the connections won't fit. Turns out I need one from 1973-74
    Last edited by steveo; 09-28-2019 at 12:31 PM.
    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  9. #58
    Senior Member steveo's Avatar
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    A bit of progress today.
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    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  10. #59
    Senior Member steveo's Avatar
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    I made a start replacing the primary chain yesterday, looks like a new stator will also be needed.
    Fitting new fork seals turned out to be a bit of a mission, weird thing was that the the oil in one fork came out fairly clean the other like yogurt.
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    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  11. #60
    Senior Member steveo's Avatar
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    After a few attempts the new primary chain and stator are on.
    The rotor/stator don't line up as you'd expect and just doen't look right, but appartently it's normal.
    Also a bit of damage to the lower edge of the crankcase.
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    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

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