CBR 900RR 1993 - 1999 Honda CBR 900RR

Help! Not firing on No#3 carb issue?

Old Nov 18, 2021 | 08:55 AM
  #21  
tommoturbo's Avatar
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Hi there thanks for the suggestion. I've made better vac hose connections for the cylinder head ports and numbered all hoses and gauges I was going to tabulate all the results but it didn't go to plan.
First I used gauge #4 On cylinder 4 got 12 mmHg or whatever it's measured in gauge #3 on cylinder 1 got 10 mmHg gauge #2 on cylinder 1 read almost 0 couldnt adjusted brass **** just went erratic. Put gauge 1 on 1 gauge was erratic adjusted brass **** got it to settle around 2mmhg.
Put all gauges back, 1 and 3 where erratic and 4 and 2 steady.
I tried each gauge on cylinder 1 they all read 2mmhg after slight adjustment. Put all gauges back and again 1 and 3 erratic.

I do think there is slight calibration errors on the gauges when pulling a harder vac and also carb / engine issues. It runs ok but with a slight miss mid range and idles ok once warm without choke and slight idle adjustment.

Thanks again buddy
 
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Old Nov 18, 2021 | 04:37 PM
  #22  
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If they're erratic, I'm suspecting then it's a vacuum leak.
 
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Old Dec 5, 2021 | 11:23 PM
  #23  
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Just an update. many thanks for your patience and help. After another strip down, clean and bench synch i managed to get it set up in the end. i was supplied incorrect main jet sizes hence the running lean over 3000 rpm replacing them solved that issue. I used a single gauge method to carry out the final set up and smaller OD vacuum hoses to eliminate any potential leaks and started adjusting the pilots in 1/8ths of a turn each time and vIts now running sweet.
Its been a learning curve and to be fair ive quite enjoyed it but couldnt have done it without the wealth of knowledge shared on here.

Cheers Ian
 
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Old Dec 6, 2021 | 05:12 AM
  #24  
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Glad you managed to sort it, what a pain being supplied the wrong jets!
A+ for effort and perseverance, I'm sure many would have given up before now
 
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