SOHC.co.uk Forums > CB750
CR carbs
Rozabikes Tim:
Should be renamed PMT carbs perhaps?
Sorry to any girls amongst us!
ST1100:
--- Quote from: rozabikes on January 16, 2016, 10:17:44 AM ---Sorry to any girls amongst us!
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Methinks you're fine as long as you don't name any parts PMS... ;)
...hon' I swear that this stands for Parked Motorcycle Syndrome, really!!... ;D
MarkCR750:
--- Quote from: Greebo on January 14, 2016, 12:14:19 PM ---
--- Quote from: bladeboy on January 13, 2016, 07:39:19 PM ---Hi, I'm thinking of fitting a set of 29mm CR carbs to my 78 cb750,
Can anyone advise me if it's a good idea or not... Cheers
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I look into this a couple of years ago before building my CB 750 K6 café racer, so I agree with Bryanj stick with the stock carbs especially if its a standard engine [not tuned]
CR carbs can even cause unreliability for race tuned engines, they are also difficult to ajust in situe.
I finished up putting K&N filters on mine [stock motor] along with re-jetting which took a bit of sorting, but it goes like stink now.... ;D
I put 135's in my k7 carbs, cheap cone filters, new diaphragm in the accelerator pump, needles on middle slots, I expected loads of messing about but it runs great, also a home made 4 into 1 (well a drastically altered piper 4into1 I should say) no flat spots, I was very surprised tbh, might go up to 138's then!, I don't know where the timing is cos it's fitted with an old piranha gizmo, I just built a new she's so now have space to complete the build at last!.
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Greebo:
MarkCR750
I forgot to mention that I also fitted a electronic ignition [ Dave Silver] & iridium spark plugs.
I would also like to add that when trying to set up the carbs it wasn't easy initially, & with the stock jets it ran like a pig, we tried different main jets & needle settings before we finished up with the set up mentioned previously.
Greebo:
--- Quote from: Greebo on January 17, 2016, 11:31:49 AM ---MarkCR750
I forgot to mention that I also fitted a electronic ignition [ Dave Silver] & iridium spark plugs.
I would also like to add that when trying to set up the carbs it wasn't easy initially, & with the stock jets it ran like a pig, we tried different main jets & needle settings before we finished up with the set up mentioned previously.
PS... when we tried the needle on the middle slot it was still lacking fuel ,even with the 138 jets,so we gradually moved it down & to get the correct fuelling the needle finished up on the bottom slot
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