Carbs suck? |
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Tony G
Senior Member Joined: 02 Aug 2020 Location: CO Durham Status: Offline Points: 375 |
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Posted: 14 Sep 2020 at 15:13 |
So I've the old air filter housing out, and found a 1989 filter wedged in place. new one ordered.
Cleaned carbs, found plenty of grot and blown out filters. Fittered plunger style chokes. Started up out of curiosity, still dose not like choke so would point to rich mixture.Left hand carb ( when sitting on bike ) sucks plenty of air, at idle but stalls if I put the choke on. Right hand carb sucks very little air at idle and the choke makes no differance. when the left hand plug cap is pulled the engine nearly stalls but the right hand plug makes no differance. both carbs suck air when revved. Any ideas
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I'll get their soon
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Had exactly the same on the Monza and only cured by replacing both plugs but am replacing the caps as well
CHRIS
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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Tony G
Senior Member Joined: 02 Aug 2020 Location: CO Durham Status: Offline Points: 375 |
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Thanks Chris ,I'll at those to my list
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I'll get their soon
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chrispy
Senior Member Joined: 18 Sep 2019 Location: Selby Status: Offline Points: 101 |
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My bike starts quite well ,
I have noticed that you require next to no choke on these bikes starting from clap cold, If I touch any choke it will stop the engine .I have only used choke a couple of times when bike has been stood for a week or so ,even then I only need choke for a second or two. have you adjusted the cable free play so both carbs slides are moving together from lifting off the idle stops ,it can be done with carb balancer gauges, or if you have the filter off try the peg trick by putting half a wooden peg resting on the carb slide sticking out of the end of the carb,then as you twist the throttle you can see the pegs start moving, they should obviously move in unison,great visual aid for getting the carb slides in balance. Cheers Chris
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Richard Hyatt
Senior Member Joined: 14 Oct 2019 Location: Dorset Status: Offline Points: 1097 |
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If the left plug cap removal makes no difference than something is not right on that cylinder.
Can you swop the plug cap and plug to the other side , then run it and see if youve 3xported the fault to that side
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Tony G
Senior Member Joined: 02 Aug 2020 Location: CO Durham Status: Offline Points: 375 |
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I did a quick visual look with the carbs of the bike. The right hand carb dose slide befor the left.
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I'll get their soon
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Tony G
Senior Member Joined: 02 Aug 2020 Location: CO Durham Status: Offline Points: 375 |
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I was toying with that idea I' do that the next few days
Thanks all
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I'll get their soon
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Well you do need to synchronise the carbs first. Both should open or close at exactly the same moment. Adjust the cables until they do, then see if it's improved.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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AdrianW
Senior Member Joined: 05 May 2019 Location: Bristol Status: Offline Points: 993 |
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Tony, As Brian says you need to synchonise the carbs first.. With mine I replaced the cables (I do this on any bike new to me) and adjusted them until I could hear them both "plop" down together. You probably need the air cleaner / pods out of the way to hear this properly. I had already refurbished the carbs at this point (new needles, needle jets & float needles) and was lucky enough to borrow a vacuum carb sync tool to finish the job. Tickover is a bit high when hot but the plugs are a lovely colour and it runs well - one of the few success stories with my bike so far...... Cheers, Adrian Bristol UK
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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It probably goes without saying but if they're that far out make sure you wind the throttle stop screws right out before doing as Adrian says. Obviously this means it won't idle but at least your cables will be properly synchronised.Then when you do a proper synchronisation using carbtune or whatever you can tweak the cables to suit.
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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Tony G
Senior Member Joined: 02 Aug 2020 Location: CO Durham Status: Offline Points: 375 |
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Thanks for all the helpful info. I'll check in the next few days and report my findings.
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I'll get their soon
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iceni
Senior Member Joined: 16 Sep 2014 Location: Colchester Status: Offline Points: 2480 |
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Not wishing to hijack the thread, I’d be chuffed if I could revert from EFI to a carb on the little Benelli!
Edited by iceni - 15 Sep 2020 at 12:32 |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Anything is possible I've been told. My response is usually "Try striking a match on a jelly".
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Brian.
Better 5 minutes late in this world than years early in the next. |
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i24
Falcone Joined: 16 Sep 2017 Location: Cape Town Status: Offline Points: 43 |
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My procedure for this:
If the carbs are clean and working properly, the bike should run nicely! Replacing worn or damaged throttle cables is a good investment. |
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Tony G
Senior Member Joined: 02 Aug 2020 Location: CO Durham Status: Offline Points: 375 |
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Brilliant advise. Thanks.
EFI to carbs, I had a similer thought with a car I had. and another thought at one time convert from petrol to diesel. I did'nt get round to the efi which is theoretically doable but probably not as efficient? As for petrol to diesel, I sold the petrol and bought a diesel. once more thanks for advice
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I'll get their soon
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