93 Zxr750 vacuum lines question
Discussion
Just balanced the carbs on the bike. Centre two carbs were joined together with a vacuum pipe, this was t'eed off in the middle and ran up to gubbins.
Vacuum line on first carb just had a little tube hanging down blanked off, number 4 carb however had no vacuum line on it at all, will I just blank that one off too? Cheers.
Vacuum line on first carb just had a little tube hanging down blanked off, number 4 carb however had no vacuum line on it at all, will I just blank that one off too? Cheers.
Are you talking about small brass pipes on the inlets between the carbs and the cylinder head, specifically for balancing the carbs?
If so then they usually have a rubber cap on them to seal them in normal use, with one of them having a pipe up to the fuel tap to provide the vacuum to open the tap when the bike is running. Is that where your tee'd off pipe goes?
If so then they usually have a rubber cap on them to seal them in normal use, with one of them having a pipe up to the fuel tap to provide the vacuum to open the tap when the bike is running. Is that where your tee'd off pipe goes?
This is the the thing when you buy second hand bikes, don't know if previous owner's got things arse over tit.
There are four brass vacuum outlets on the engine block, I think lines have been put on wrong by someone.
In a diagram I saw online the third brass outlet on the Block (3rd away from you standing on left of bike) should be blocked by a bolt. So I'm thinking the line I have with the t piece in the middle should join from carb 2 to 4.
The t off goes up over the the top of the engine to some emission gubbins thing.
So the 1st vacuum outlet on the left of the bike which someone has blocked off should go somewhere and 'not' be blocked off?
There are four brass vacuum outlets on the engine block, I think lines have been put on wrong by someone.
In a diagram I saw online the third brass outlet on the Block (3rd away from you standing on left of bike) should be blocked by a bolt. So I'm thinking the line I have with the t piece in the middle should join from carb 2 to 4.
The t off goes up over the the top of the engine to some emission gubbins thing.
So the 1st vacuum outlet on the left of the bike which someone has blocked off should go somewhere and 'not' be blocked off?
If you have a vacuum tap, which is the norm on a carbed bike then it has to get a vacuum or it will not work. That usually comes from one of the inlets, although I can accept that joining two together and tee'ing off from that will perhaps give a more stable vacuum feed to the tap.
Emissions control on a ZXR? Bit old for that, perhaps.
Emissions control on a ZXR? Bit old for that, perhaps.
Emission control, you know what I mean, the canister things on top of the engine, only way I could think to describe it, hoses come off them going all ways.
Anyway, an update, balancing went perfectly, last night I discovered a diagram for a European model, routing of the vacuum pipes. I've included a pic, the two pipes that go up over the top of the engine to the canisters were linked up differently to mine, so I changed them to suit.
Fired bike up, it just seemed to pop more rolling off the throttle when revving it, and little intermittent pops at idle. Thought then maybe it's because air box is off and more air was getting in, put on air box and it didn't change anything.
The four brass outlets the vacuum pipes are connected to, I'm starting to think it doesn't really matter what outlet goes to what, a vacuum outlet is a vacuum outlet!
Tried linking it up all ways and bikes always running the same.
I just feel there's tiny little misses in the idle that weren't there before, I'll give it a run and see how it goes.
(Incidentally, haven't been near fuel tap hoses]
Anyway, an update, balancing went perfectly, last night I discovered a diagram for a European model, routing of the vacuum pipes. I've included a pic, the two pipes that go up over the top of the engine to the canisters were linked up differently to mine, so I changed them to suit.
Fired bike up, it just seemed to pop more rolling off the throttle when revving it, and little intermittent pops at idle. Thought then maybe it's because air box is off and more air was getting in, put on air box and it didn't change anything.
The four brass outlets the vacuum pipes are connected to, I'm starting to think it doesn't really matter what outlet goes to what, a vacuum outlet is a vacuum outlet!
Tried linking it up all ways and bikes always running the same.
I just feel there's tiny little misses in the idle that weren't there before, I'll give it a run and see how it goes.
(Incidentally, haven't been near fuel tap hoses]
Edited by robbocop33 on Sunday 5th November 12:31
Been out for a run, worse than it was before I balanced carbs?? Must be these vacuum hoses. Bike starts perfectly, idles fine, revs freely at idle.
When driving it today it pulls well in first, second. However say if you're pootling along in 3rd about 40mph and pin it it's flat as hell, no response, drop down to 2nd and off it goes.
Just ran it around the streets, didn't go out for a real good run up the gears due to knowing bike wasn't pulling.
When driving it today it pulls well in first, second. However say if you're pootling along in 3rd about 40mph and pin it it's flat as hell, no response, drop down to 2nd and off it goes.
Just ran it around the streets, didn't go out for a real good run up the gears due to knowing bike wasn't pulling.
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