Evaluating Old Honda Twins - Six Easy Steps
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  1. #1
    Supporting Member MNellis's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    Nice job Bill, lots of good information.

    Thanks
    Mike Nellis, CMRA Expert GSXR1K 1976 Honda GL1000 1968 Honda CL350 1975 Suzuki T500 1970 Honda CB450 K3
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  2. #2
    leethal's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    Supurb introduction for newbs. Now you just need to turn it into a pop-up feature on the board index screen
    ...punks not dead...it just smells that way...

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  3. #3
    krukster86's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    Make this a sticky? Hell even make it show up on the front page!
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  5. #4
    Member gord's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    I didn't catch the 95 octane requirment in my manual, that's good stuff. The highest pump gas we can get is 94 from sunoco.

  6. #5
    krukster86's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    Quote Originally Posted by gord
    I didn't catch the 95 octane requirment in my manual, that's good stuff.
    Me too! I have been filling up with 87
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  7. #6
    krukster86's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    I looked this up in my manual. It says to use a Pump Octane level of 86 or higher, or a Research Octane Level of 91 or higher for a CB360.
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  8. #7
    Supporting Member kirkn's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    ... and isn't "today's" octane rating an average of the two? Research Octane + Motor Octane / 2?

    That'd be (86 + 91) / 2 = 88.5

    I'd still save the 10 cents per gallon, and go with 87!


    **edit** - oops, I just Googled it - Pump Octane IS R+M/2, which would imply that you'd be good with today's 87. On the other hand, the CB360 came out in '74, when Honda surely would have known of the coming changes in fuels availability, and likely designed the engine around those availabilities. But not the older 350s, I'm thinking...
    Kirk


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  9. #8
    Senior Member JeyLux's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    mine CL350 ran like a top on the highest octane at the pump, and felt sluggish with 87. just my gut feel, but i will run the 5 dollars a more a year in gas for the good stuff.
    1972 CL350K4 [Sold]
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  10. #9
    Senior Member JeyLux's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    Quote Originally Posted by tbpmusic
    Quote Originally Posted by JeyLux
    mine CL350 ran like a top on the highest octane at the pump, and felt sluggish with 87. just my gut feel, but i will run the 5 dollars a more a year in gas for the good stuff.
    Like I said, the proof is in the pudding - you can't argue with results......

    My butt-dyno has proven to be pretty accurate in the past.
    1972 CL350K4 [Sold]
    1973 CB500/K Street Tacker [Sold]
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    2004 Husaberg FE450e [Dirt Bike]
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  11. #10
    Member gord's Avatar
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    Re: Evaluating Old Honda Twins - Six Easy Steps

    Hi, a question about comp. testing a cold engine, I understand that this will result in about 5 psi less than a warm engine but would the same apply to an engine that hasn't run in yrs. or should I expect less? Thanks

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