vincejames
XS650 Addict
Edited
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Almost got her tuned juuuuust right
- Thread starter vincejames
- Start date
Edited
I'm satisfied your test and the diaphragms are both correct and working. Especially when I heard the rush of air when you removed your thumb from the right one.
vincejames
XS650 Addict
Agreed. Thank you for taking a look.
Brassnecks video shows you clearly what I have been saying all through this thread.
The slides should stay in place when you release them and then very slowly descend
Watch Brassnecks video then watch your own video ! See if you can spot the difference !
Your slides shouldn't suddenly drop sharply for the first 1/3rd of their travel This is the cause of your transition problem from idle to 1/4 throttle .
As you and WER clearly feel that you have a better understanding than me of how these carbs function I'll leave it to you to resolve the transition issue
Sorry that I couldn't be of more help
. good luck
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vincejames
XS650 Addict
I completely understand what you are trying to say. The slide should slowly fall at a consistent pace as soon as you life the slide then cover the hole. It should not drop suddenly (indicating an idle to 1/4 throttle issue ) THEN slowly fall.
I guess then for myself, and others who might view this thread in the future, what would you say would be the correct way to fix this quick descend? If my rubber is brand new with 0 holes and it is superglued into place, how would I then fix the problem? I see it as an issue with the diaphragm edges and them being lifting off of the slide body itself when the slide is lifted THAT high.
Thanks, Peanut. In no way am I trying to test your expertise. I'm just trying to wrap my head around your thinking..
Weekendrider says that your diaphragms are working properly
You have agreed that they are....
I'm not sure what you expect me to say ?
I have identified the source of the problem but you seem to be adamant that I am wrong .
Weekendrider seems keen to help so I'm happy to leave it to him .
I come on here for the pleasure of helping other owners and chatting to friends. I try to avoid those few members like WER that seem determined to disrupt and antagonise .
Life is too short
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vincejames, It is hard to see what really happens in your vid, It doesn't show the slide at all times, especially the right one, so it is hard to tell if the slide has dropped fast. When i do this test i always lick my thumb to help ensure a good seal.
I cannot understand how a slide will drop quickly, (as seen by others not me) and then slow to a crawl. It either has a leak or it doesn't.
If the thumb doesn't make a proper seal at all times you can get the result, that Peanut describes you are getting on the right side, but because i couldn't see the whole process i couldn't say if there was a problem.
In Brassneck's video i can see a good a clear view of the whole process at all times, in your video i can't, so i don't know why you are getting advice on something that cannot be seen
I cannot understand how a slide will drop quickly, (as seen by others not me) and then slow to a crawl. It either has a leak or it doesn't.
If the thumb doesn't make a proper seal at all times you can get the result, that Peanut describes you are getting on the right side, but because i couldn't see the whole process i couldn't say if there was a problem.
In Brassneck's video i can see a good a clear view of the whole process at all times, in your video i can't, so i don't know why you are getting advice on something that cannot be seen
yes thats a valid point. I have assumed that Vince had understood that the vent has to be completely sealed before letting the slide drop.
It would be a good idea for Vince to video a retest of both carbs so that it is clear whether or not the vent is sealed properly.
I think his perceived diaphragm problem was due to his testing method in his 1st vid. He blocked the oval slot off with electrical tape and the slide was still down. When he lifted the slide, that created pressure on that tape and I think it came loose in a couple spots. When he released the slide, it dropped and tried to create a vacuum. At first it couldn't because the tape was loose, so it dropped quickly. After it dropped quickly for a short distance, it sucked the tape in tight again, sealed it, and started falling slowly.
I didn't notice this post 2M.
I wasn't aware of the air link to the choke . You may have found the source of the air leak. Great post.
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I thought that Vince had redone the test using his thumb to block the vent .
If he hasn't then you're right about the tape leaking but..... that still wouldn't account for why his diaphragms don't appear to be enriching his throttle transition mixture off idle .
An easy test to prove this would be to partially block the carb inlets with the palm of a hand (without blocking any vents of course ) to raise the venturi pressure and see if the engine revs up cleanly off of idle when twisting the throttle.
I rather like 2Ms suggestion for the source of the air leak. I had air leaks around both my choke bodies. If Vince had removed these to clean the carbs there could be a potential air leak there perhaps. I can't see where else air could be leaking in
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@vincejames, next time set the camera on a box or something where it will get the shot but you can use both hands.
@p nutz enough with the hate slinging.
@p nutz enough with the hate slinging.
Peanut. Answering every ones post is clogging up the thread and makes for a confusing read. Not everything is directed to you.
Don't answer to this post please, just think about it.
Don't answer to this post please, just think about it.
Why are you even posting here skull ?
You clearly had absolutely no idea what was wrong with Vinces carbs nor did you have any understanding of the throttle transition operation of CV carbs until I explained it .
We are all here trying to solve Vinces problem. There is nothing wrong with discussing the problem amongst ourselves in that process. Its how Think Tanks arrive at a solution. It is all about looking at the possibilities, weighing up the options, explaining details and contributing information and experience.
You clearly have no work/life experience of working as part of a team skull.
In case you have forgotten it was me that identified the transition problem ...you came along later to stick your oar in and stir things up as usual .You just can't help yourself can you
You are the only person in this thread that has made a completely useless,.. non constructive... post that contributes nothing to solving Vinces problem .Now in responding to your stupid interjection has made me the second .
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Fuck you Peasant..........................Your posting over everyone else who has an opinion, weather it is aligned with yours or not. You can't stand the idea that your opinion is not taken as the holy grail of peanuts great experience with CV carbs, and to hell with what any one else may know...........How would you know what my experience is when it comes to testing the diaphragm, or any thing related to CV carbs.
How many years did it take you to work out how to fix your carbs.....................By the way you never finished your threads explaining if you actually did fix your one set of carbs you have worked on.
So giving bad advice on based on results of something that isn't done properly in the video is just plain wrong and misleading.........................If you took the time to actually look at the video you can see that the same thumb that lifts the slide, is then used to cover the venture. Impossible to be done without the slide dropping quickly before the thumb blocks of the venture, and then it will drop quickly after that due to the fact that air has got into the top of the diaphragm between the time it takes to shift the thumb from the slide to the venture..
I made my post to give the OP another opinion rather than the bickering and "my opinion is better than yours" attitude that was getting posted by you, through out this thread
How many years did it take you to work out how to fix your carbs.....................By the way you never finished your threads explaining if you actually did fix your one set of carbs you have worked on.
So giving bad advice on based on results of something that isn't done properly in the video is just plain wrong and misleading.........................If you took the time to actually look at the video you can see that the same thumb that lifts the slide, is then used to cover the venture. Impossible to be done without the slide dropping quickly before the thumb blocks of the venture, and then it will drop quickly after that due to the fact that air has got into the top of the diaphragm between the time it takes to shift the thumb from the slide to the venture..
I made my post to give the OP another opinion rather than the bickering and "my opinion is better than yours" attitude that was getting posted by you, through out this thread
Vince I would love to continue helping you with your carb issues but I think there are two many prima donnas on here now that think they own the place and like throwing their weight around and bullying other members.I have several life threatening health issues and have too little time left now to waste with these w*nkers
As a parting observation I reread your first post and see that your Pilot jets are way too rich at 40.
What you need to do is to break your engine performance down into 4x throttle positions 4x quarters of the throttle range and tackle and resolve each section seperately.
The idle is governed by the pilot jet and the air mix screw together with the slide cutaway. Nothing else .
I suggest you fit 30 pilots warm the engine,adjust your idle speed to around 1000rpm then adjust your air mix screw 1/4 turn at a time until you get the best idle ,(usually when the idle speed will not increase or the engine note will not improve anymore). If the air mixture screws need to be less than 1x turn out your pilot jets are probably too lean ie too low number. If you need to screw the air screws out more than 2.5 turns then the pilots are too rich (too high number)and you need to go down ie lower number.
Pilot jets cost shirt buttons . I would suggest if you have 3x bikes you need to invest in a reasonable range like 27.5 (stock) 30, 32.5 , 35, I'd be concerned if you needed a richer pilot than 35 on a stock engine with stock BS38s .
Keep in mind when testing carbs that its all about throttle position not speed
As a parting observation I reread your first post and see that your Pilot jets are way too rich at 40.
What you need to do is to break your engine performance down into 4x throttle positions 4x quarters of the throttle range and tackle and resolve each section seperately.
The idle is governed by the pilot jet and the air mix screw together with the slide cutaway. Nothing else .
I suggest you fit 30 pilots warm the engine,adjust your idle speed to around 1000rpm then adjust your air mix screw 1/4 turn at a time until you get the best idle ,(usually when the idle speed will not increase or the engine note will not improve anymore). If the air mixture screws need to be less than 1x turn out your pilot jets are probably too lean ie too low number. If you need to screw the air screws out more than 2.5 turns then the pilots are too rich (too high number)and you need to go down ie lower number.
Pilot jets cost shirt buttons . I would suggest if you have 3x bikes you need to invest in a reasonable range like 27.5 (stock) 30, 32.5 , 35, I'd be concerned if you needed a richer pilot than 35 on a stock engine with stock BS38s .
Keep in mind when testing carbs that its all about throttle position not speed
Grow up skull ....
your continual aggression and and personal insults on this forum are becoming really tiresome.
It was only a few days ago that you set about attacking another member Yamaha77 as I recall.
its little wonder that you have no friends.......... you're so volatile, bitter and unpredictable who would want to hang with you
I don't suffer fools gladly..........................If that makes me friendless to you then i don't mind at all.
vincejames
XS650 Addict
Now now, we are all men here! I certainly don't know you guys as good as you guys seem to know each other because I've only been a member of the forum for a couple months. I just try my best to give as much knowledge as I can to people in need because I want to see more XS650s on the road so that one day they increase in value more than they currently are.
Let's get back to the issue at hand....Shall we?
Diaphragms: I went back and did the test by holding my thumb firmly over the hole. The slide drops very slow as soon as I let it go. I think that PEANUT had a really good point here. The diaphragms that came on these carbs were very worn out and the replacement diaphragms definitely helped with a stronger idle and less flat spots (my carbs were in very bad shape). HOWEVER, I'm to the point where I really DO think it is a jetting issue. Again, I have PRETTY short 2 to 1, (but not as short as some people on here) and am running a 40 pilot and a 145 main, needle clip at 3, mixture screw 1/2 turn out.
Peanut - I've tried a 145 main and a 30 pilot - still had flat spots. I'm now waiting on more jets to arrive to do further testing.
The weather in Chicago has been TERRIBLE, non-stop rain. I've yet to give it an official test ride after slightly modifying the diaphragms. Once I get a chance to take it for a test ride we will know who has been right and who has been wrong. Peanut - I actually did notice that one of the slides did turn slightly when I was doing my drop test the other day. You might have be right all along. Who knows? I will report back soon!!!!
Let's get back to the issue at hand....Shall we?
Diaphragms: I went back and did the test by holding my thumb firmly over the hole. The slide drops very slow as soon as I let it go. I think that PEANUT had a really good point here. The diaphragms that came on these carbs were very worn out and the replacement diaphragms definitely helped with a stronger idle and less flat spots (my carbs were in very bad shape). HOWEVER, I'm to the point where I really DO think it is a jetting issue. Again, I have PRETTY short 2 to 1, (but not as short as some people on here) and am running a 40 pilot and a 145 main, needle clip at 3, mixture screw 1/2 turn out.
Peanut - I've tried a 145 main and a 30 pilot - still had flat spots. I'm now waiting on more jets to arrive to do further testing.
The weather in Chicago has been TERRIBLE, non-stop rain. I've yet to give it an official test ride after slightly modifying the diaphragms. Once I get a chance to take it for a test ride we will know who has been right and who has been wrong. Peanut - I actually did notice that one of the slides did turn slightly when I was doing my drop test the other day. You might have be right all along. Who knows? I will report back soon!!!!
What was done?
