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Recent content by madmtnmotors

  1. madmtnmotors

    New to 750s, Have a few questions

    http://www.sohc4.com/cb750/cb750k/
  2. madmtnmotors

    New to 750s, Have a few questions

    People seem to value the earlier models (69-76) more highly than the later models (77-78) which works for me since I value my K8's quite highly: Plus, I'm having an absolute blast with them! I would steer clear of the "A" (automatic) models since they are sort of freaks of mechanical nature...
  3. madmtnmotors

    A golden moment.

    The older SOHC/4 Hondas (69-78) typically get a lot of attention wherever I go. Everybody either had one or knew someone that had one (dad, brother, best friend, etc). Been to Bike Week at Daytona many times and my Harley riding buddies get so pi$$ed when people fawn all over my 78' CB750...
  4. madmtnmotors

    Low top speed

    What motivated you to put huge 125 mains and then step up to massive 130 mains? Stock mains were 115's. Have you checked your plugs? I'll bet you find them black from carbon being overly rich. Check your compression while you're at it and let us know what you find.
  5. madmtnmotors

    Maiden ride didn’t go so well

    Hard to say, you are making too many changes at once to be able to pin down a single cause. The air fuel screw has the most impact at lower rpm and I don't think it would have much effect at higher rpm. As for syncing the carbs, these motors run very well with a proper carb sync, but I would...
  6. madmtnmotors

    Maiden ride didn’t go so well

    2 and 3 can indeed be timed separately with the Dyna S. https://www.mpsracing.com/instructions/Dynatek/DS1-1_1-2.pdf You can swap the coils from 1/4 and 2/3 by switching the blue/yellow and the spark plug leads to see if the problem follows the coil. If not, then you can focus on the 2/3 trigger.
  7. madmtnmotors

    Stockish rebuild? What should I do

    Agreed. I've used the anaerobic sealer that was specified by the manufacturer to seal the case halves on two stroke outboard engines.
  8. madmtnmotors

    Stockish rebuild? What should I do

    Sounds like you are well on your way to spending in excess of $5,000 on just the engine... Any sort gasket between the case halves would affect crankshaft main bearing clearances. Hondabond, used sparingly, and absolutely NO SILICONE.
  9. madmtnmotors

    Stockish rebuild? What should I do

    That last picture looks like it could very well be leaking between the upper and lower case halves. Splitting the cases gets expensive when you fall down the rabbit hole mentality of "while it's apart" might as well do the following: >New primary chains and tensioner >New primary drive cush...
  10. madmtnmotors

    Stockish rebuild? What should I do

    I was just reacting to your $1500 budget for the engine. If you split the cases you can quickly exceed $1500. I don't know if I've ever seen a CB750 leaking between the seams in the upper and lower case, typically the leaks are at the gaskets or seals which can all be replaced without splitting...
  11. madmtnmotors

    Stockish rebuild? What should I do

    How many miles on it? Does it currently run? A rebuilt head will cost you $1000 to $1500 (or more) depending on what you have done. I just had a cylinder head "stage two" done for $1500 and that was with friends and family discount. Align honing the cases for the crankshaft is overkill unless...
  12. madmtnmotors

    What size bulbs

    $1.38 is too expensive? The same bulbs were used in 70's and 80's Honda cars, Honda part #34902-259-000: https://www.hondapartsnow.com/genuine/honda~bulb~dash~34902-259-000.html
  13. madmtnmotors

    Front Caliper Bolt

    I would remove the wheel, drill the head off, and remove the caliper. This should leave a "stem" of the bolt where it passes through the fork lower that should be enough to get purchase with vise grips.
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