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CB750 Barn find project - First Timer
hairygit:
As regards power to the coils, check that you have 12v reaching the kill switch on the bars (inside headlamp). As regards the clutch, it's not a difficult job to strip it out and free it off, and far safer than bumping it and hoping it will free off, especially if you have hotwired the coils!
Underdog1:
--- Quote from: Nurse Julie on August 20, 2018, 03:04:40 PM ---Well done. Take the tappet covers off to see if oil is spitting out and maybe you should locate the tacho drive cable in correctly 🙂🙂🙂
--- End quote ---
Already done the tappets and there’s oil spitting about in there :D with regards to the tacho cable it’s a super cheap one from mandp and isn’t a very good fit despite them saying it fits the bike
--- Quote from: hairygit on August 20, 2018, 03:05:57 PM ---As regards power to the coils, check that you have 12v reaching the kill switch on the bars (inside headlamp). As regards the clutch, it's not a difficult job to strip it out and free it off, and far safer than bumping it and hoping it will free off, especially if you have hotwired the coils!
--- End quote ---
Nice one mate that’s why we ask these questions (so I don’t end up in my neighbours hedge!)
Underdog1:
Today was a good day
Found that one of the kill switch wires was going into the lighting circuit rather than to black, sorting that out sorted the power to the coils, not sure how I missed that the other day!
Popped the clutch out and rubbed down each of the metal plates with 600 grit, plenty of wear left all round so just reinstalled and voila, my clutch is working.
Popped the tank and seat back on along with some half painted side covers and took her out for her maiden voyage (private road of course). All seems great, apart from a lumpy idle, carbs haven’t been synced so that may help but I don’t think pods do the idle any favours, had to set it to >1000rpm to avoid stalling. Brakes need adjusting but no real dramas there.
Was very surprised with how nicely it pulls especially as I’ve just stuck #42 and #120 jets in there as just somewhere to start, was fully expecting It to be rough whilst I dialled it in.
Where’s best to go from here with the carbs - sync them and get some miles on the clock and then note down flat spots etc check plug colour and adjust from there?
Also one or two carbs are overflowing when the engine is switched off, floats aren’t stuck and the pins are nice and clean, any usual suspects to look out for?
Bryanj:
There are only a few reasons for carb overflow,,
Float height incorrect
Bad needle tip/seat
Crack in brass standpipe inside float bowl
Underdog1:
--- Quote from: Bryanj on August 24, 2018, 06:31:47 PM ---There are only a few reasons for carb overflow,,
Float height incorrect
Bad needle tip/seat
Crack in brass standpipe inside float bowl
--- End quote ---
The carbs have been fully rebuilt with a cruzin image kit, I set the floats to 26mm above the carb body, no cracks in any standpipes.
It’s intermittent and seems to happen after I shut the engine off which in my head makes me think potential stuck float - maybe there’s a burr or something.
Will have to get the bowls off again and have another look, for now I’m just turning the pet cock off when I stop
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