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  1. The Jimbonaut

    '81 CB750 rear wheel hub question

    Got the rear wheel off yesterday and opened up the hub and drum. According to the Clymers, this bearing retainer is supposed to unscrew, but mine is not moving for love or money, at least not by hand. Here's a photo of the wheel - The bearing retainer is looking a bit beaten up as well...
  2. The Jimbonaut

    Need to raise the suspension on my CB750

    Here's how it looks now - A previous owner chucked some 11¾" shocks on the back which is all fine and dandy but they ain't gonna cut it for the build I have in mind. I want to raise the rear to give the bike a straighter look, thinking 14" - 15", but trying to figure out which size to...
  3. The Jimbonaut

    Looking online for OEM parts for '81 CB750

    Evening one and all, Looking online for some fairly obscure parts for the front brake caliber (dust boots, piston, brake pads plus a few other random parts) - anyone recommend some well-stocked online sites? I've had a good look around (bikebandit, houseofhonda, partzilla, hondapartshouse...
  4. The Jimbonaut

    Decent cylinder compression but cold exhaust?

    Just finished a valve clearance check, replaced a few shims and now have 0.005" clearances across the board. Emptied a can of Honda's carb/combustion chamber cleaner into the carb intakes and compression check now looks better - #1 - 140 (130 before) #2 - 150 (same) #3 - 165 (150 before) #4 -...
  5. The Jimbonaut

    How to install new cylinder head cover bolts?

    Hi guys, The rubber grommets on my cylinder head cover bolts are shot (crumbling big time) so I bought some NOS replacements yesterday. I've removed the 4 outside bolts from the cover (not the 4 inside ones yet), but I don't know how to a) remove the 4 inside bolts and b) install all 8 of the...
  6. The Jimbonaut

    High valve clearance on #1 exhaust cylinder - cause for low compression?

    I did a valve clearance check today, the numbers looked like this (from left to right, sitting on the bike) - Exhaust - 0.004, 0.009, 0.002. 0.002, 0.003, 0.003, 0.004, 0.003 Intake - 0.004, 0.004, 0.004, 0.005, 0.004, 0.003, 0.006, 0.004 The compression test I ran the other day gave these...
  7. The Jimbonaut

    Oil not draining from cylinder head?

    I'm trying to check the valve clearances on my '81 cb750, and there's a lot of oil in the pockets in the cylinder head surrounding the valve lifters - so much oil in fact that the shims are totally covered in the stuff. The front cam (exhaust cam?) is almost overflowing over the valve cover...
  8. The Jimbonaut

    Hi from Montreal from me and my newly-starting '81 CB750

    Hi from Montreal, new guy here embarking on his first restoration/build project, and excited by the challenge. Well, after a week (I'm no mechanic it should be said) I got her running =) New battery, cleaned the carbs (not gonna eat your breakfast off them but good enough for starters -...
  9. The Jimbonaut

    Finding TDC on compression stroke on cylinder 1?

    Hi one and all, Need guy here so hello and high fives to one and all =) I'm working on my '81 CB750K, total novice (bought the bike a few weeks ago - cleaned out the carbs and got it running a few days ago but it's a long way from purring like a kitten), and going through the owners manual's...
  10. The Jimbonaut

    Hi from Montreal from me and my non-starting '81 CB750

    Hi one and all, Jimbo here in Montreal, after 5kms of pushing I finally got this beauty into my garage - Doesn't start, flat battery...this is my winter taken care of. This is my first Honda rebuild and restore, looking forward to getting started and thanks in advance for any help I get...
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