How many miles are too many?
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How many miles are too many?

This is a discussion on How many miles are too many? within the Technical forums, part of the Caferacer.net Forums category; I'm looking to buy a '78 CB750 supersport with 35k miles on it. Gave it a ride this weekend, and other than shaky idle on ...

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  1. #1
    Junior Member bc66's Avatar
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    How many miles are too many?

    I'm looking to buy a '78 CB750 supersport with 35k miles on it. Gave it a ride this weekend, and other than shaky idle on start up it looks and sounds decent. I'd appreciate any opinions on whether I can expect any big future mechanical jobs on this engine with 35k miles on it. Incidentally, owner is asking $2,300 for it. Thanks for any input.

  2. #2
    Senior Member mlinder's Avatar
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    Who knbows? It all depends on how well it was taken care of in the last 35k miles.
    http://quiterandom.hubpages.com/hub/...sic-motorcycle How to buy a used bike
    http://quiterandom.hubpages.com/hub/...the-Cafe-Racer How to build a cafe racer

    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

  3. #3
    Senior Member mlinder's Avatar
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    Who knbows? It all depends on how well it was taken care of in the last 35k miles.
    http://quiterandom.hubpages.com/hub/...sic-motorcycle How to buy a used bike
    http://quiterandom.hubpages.com/hub/...the-Cafe-Racer How to build a cafe racer

    It's like a Machiavellian 4-volume trilogy based on Hamlet senza misura with an ego-maniacal downs syndrome kid reading from a Rube Goldeberg-esque kindle.

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  5. #4
    Senior Member OC Steve's Avatar
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    Yes, how well it was taken care of does matter. But 35k on an aircooled bike engine is 35k on an aircooled bike engine, no matter how well it was taken care of.

    At that mileage, I would do one of two things: 1) get a compression test, and send a sample of oil to a testing lab; or 2) just figure it may be good for a few more years, but will soon be due for a rebuild, and buy it at a price that accounts for that.

    There, that's my amateur advice, from a guy who has never owned a CB750. More experienced CB750 folk will be along soon to add some actual reliable information.

  6. #5
    Senior Member OC Steve's Avatar
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    Yes, how well it was taken care of does matter. But 35k on an aircooled bike engine is 35k on an aircooled bike engine, no matter how well it was taken care of.

    At that mileage, I would do one of two things: 1) get a compression test, and send a sample of oil to a testing lab; or 2) just figure it may be good for a few more years, but will soon be due for a rebuild, and buy it at a price that accounts for that.

    There, that's my amateur advice, from a guy who has never owned a CB750. More experienced CB750 folk will be along soon to add some actual reliable information.

  7. #6
    Senior Member Geeto67's Avatar
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    first off - too much money.

    Second - 35K on a 77-78F is the tipping point. You will want to know if the bike had valve guides installed. The 77-78 SOHC big valve heads tend to wear out valve guides right around 30K. Less if it was beaten, a little more if it was taken care of. At 35K, and it is not smoking, you probably have 1 or 2 thousand miles before she starts smoking, and when she does it is an expensive repair if you don't do it yourself. Ask the owner if new valve guides were installed, if they were then great.

    The rest of the engine is good for 75-100K if you take care of it and there is not something nasty hiding in there already.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
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    A tool is just an opportunity with a handle
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  8. #7
    Senior Member Geeto67's Avatar
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    first off - too much money.

    Second - 35K on a 77-78F is the tipping point. You will want to know if the bike had valve guides installed. The 77-78 SOHC big valve heads tend to wear out valve guides right around 30K. Less if it was beaten, a little more if it was taken care of. At 35K, and it is not smoking, you probably have 1 or 2 thousand miles before she starts smoking, and when she does it is an expensive repair if you don't do it yourself. Ask the owner if new valve guides were installed, if they were then great.

    The rest of the engine is good for 75-100K if you take care of it and there is not something nasty hiding in there already.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
    - Samuel Beckett
    A tool is just an opportunity with a handle
    - Kevin Kelly

  9. #8
    Senior Member Geeto67's Avatar
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    fill out your bio. If you are in NY, I'll sell you the same bike for similar money with just over 5K on the clock and a brake upgrade.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
    - Samuel Beckett
    A tool is just an opportunity with a handle
    - Kevin Kelly

  10. #9
    Senior Member Geeto67's Avatar
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    fill out your bio. If you are in NY, I'll sell you the same bike for similar money with just over 5K on the clock and a brake upgrade.
    Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better.
    - Samuel Beckett
    A tool is just an opportunity with a handle
    - Kevin Kelly

  11. #10
    Junior Member bc66's Avatar
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    Geeto, I'm over the border in Nassau County. Do you have any pix of your bike for sale?

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