SOHC.co.uk Forums > CB750

Got it running but got some problems

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Robbo:
I finally got my beauty running this weekend - what a treat.

There are a few bits that need adjusting and I thought I would put it out here to see what you guys advise.

Carb 1+4 spit back sometimes, Carb 1+4 leak petrol through the jets that point to the filter, Downpipes 2+3 are hot, whilst 1+4 are lukewarm.

I'm sort of guessing the floats need adjustment as the fuel begins to spill from the jets as soon after the fuel has been turned on, not quite sure about the spitting(backfiring?) but again this might have something to do with over fuelling perhaps? What I really don't have clue about it the difference in downpipe temp.

Any advice or info would be very helpful.

LesterPiglet:
Yep, check those carbs and clean them. 1 and 4 use the same coil/points so check those areas. 1 and 4 are colder cos they aren't firing properly due to the point/coil...possibly carb problem.

K2-K6:
I'd go with floats and needle valve first as well.

If you turn the fuel on until it just starts to leak then turn it OFF again it should then run reasonably well if it's just the fuel overfilling (they would run to about 5 miles with fuel off with those carbs). Should allow you to verify if it's just the carbs (float operation) doing it if the running cleans up.

UK Pete:
The press in pilot jets in these carbs are really prone to blockage causing low running problems , i would take the carbs off and apart, cleaning everything , also the accelerator pump jets and diaphram can cause problems in a bike that has sat about a few years
pete

Robbo:
How do I get the press in pilot jets out? I had a look before but I thought they were fixed?
I have had them apart and sprayed carb cleaner through all jets until they were clear. I'm getting pretty good at removing and replacing these carbs now!
How do I know if the pump is working and how do I fix it if it isn't?

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