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running problems after rejeting
Old 04-26-2016, 06:11 PM   #1
kensshadow
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running problems after rejeting

I wasn't sure were to put this topic (here or on my build but thought it might serve better here)
anybody that followed my build or seen me posting knows I was afraid to lose the air box and rejet ,,, well my fears have become a reality , hope it can be sorted as I hate a bike that doesn't run properly ,I'm using a slightly baffled straight pipes,stacks and jets from carbjetkits ( two Main jets size 125 , two Pilot jets size 42 and 2 shim for each Slide Needle). the bike starts from cold good and revs freely and idles , after about 4-5 mins you notice that's she hunts up and down a little , if left alone she will die out and doesn't start very nicely , if you give her a few good revs she will be ok for another minuite but will start to drop revs again and die out , I took out a couple of the plugs and they are sooted so shes not getting starved of fuel , if you let her die out and sit a couple of minuites she will only start with a full throttle and black smoke everyware and a strong smell of petrol (she feels flooded) listen to the folling video , the bike was stopped a few minuites and this sound starts , I cant tell if its from one carb or both (I think its only one though) it sounds to me as if fuel is leaking into a cylinder , whats your thoughts ?normal ? cause ? solution? thanks
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Old 04-26-2016, 06:16 PM   #2
kensshadow
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and I have tried different settings on the air mixture screw (1'1/2,, 1'3/4,,2,,2'1/2,, 3 , made no difference , seemed happier around the 2 I think but still dies out
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Old 04-27-2016, 01:04 PM   #3
gb6049
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How does it run on the road? Checked for vacumn and exhaust leaks? While the engines are slightly different, I believe the carbs are the same for the the VLX and my VT750DC. I ended up with Keihin 45 slows, and 145 mains 2.5 turns out. Runs good and idles fine.
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Old 04-27-2016, 02:09 PM   #4
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I'm thinking its a stuck or dirty float needle , I'm going to stop down and look
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Old 04-27-2016, 03:22 PM   #5
gb6049
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Good luck with it. If you haven't already, look at some of the carb tuning post by McV. Might find something that answers the problem.
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Old 04-27-2016, 05:44 PM   #6
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No luck ! Striped it down tonite and could see nothing wrong , no obvious dirt or sticking needle , I washed it all out again and blew an airline through it , when blowing through the petrol line it stops ok when you close off the float , float seems to be closing off at a normal place ( float floats ok too) built it up again and fired her up , she idled like a new bike for about 5 minuites and then started to hunt again :-( eventualy dieing out , restarts ok but again 30 secs later dieting out , let her sit and a few minuites later you can here the same sound again !! I tried to start her after 5 mins and eventualy started but the smell of petrol and black reek was terible ,!!! Btw when I removed the carbs I looked down the inlet into the cylinders and one of them had a wee puddle of petrol sitting there ! What is letting the petrol into the cylinder when stoped ????
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Old 04-28-2016, 01:51 PM   #7
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Which cylinder? Float is not letting the needle valve seat or there is a bad needle valve in that cylinders carb.
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Old 04-28-2016, 06:32 PM   #8
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guy thanks for the help and staying with me on this !!! I didn't know what type or how the choke operated and was afraid that maybe I had fouled a cable or something and was stopping it from going off, well I was able to check it tonite and an was even able to remove it and its defiantly not a choke problem ,,i have a few photos and 2 videos I want yous to see , ill tell yous what I did tonite, I checked the choke thing and was nearly 100% sure it wasn't at fault so I fired her up
this is her running li9ke a new bike


and after a few minuites it started dieing out again well I waited for the hissing noise again and it started , I went as quick as I could and removed the tank to get close to the stacks , the folling video shows the sound coming from both stacks !

well I pulled off the carbs as quick as I could as I wanted to see was there petrol running into the cylinder , ,,,,,



2 of the cylinders are flooded !! well that's proven shes getting plenty of juice anyway lol
anyway I striped down both carbs again (3 or 4th time ) I first removed the slide and then the needle , I had installed 2 washers per slide so I removed one washer and rebuilt each slide (both were striped and rebuilt singly like I did at the install time so I didn't mix anything up )there is nothing wrong that I can see (clean and no tears and everything sitting in its place)
I removed the bowls/needles/floats again still working and look ok , as ther has been a lot of mention of the float needle I took a photo of it , there looks like a line around it where it seats but you cant feel it , (is this the fault?)

well I rebuilt the bowls up again and checked that nothing on the outside of the carbs was fouling (all linkages etc are moving and stopping where they should )
put the carbs back on the bike and fired her up again ,,,,,,,,,,,,,,,,,,,,,,,,,,,,
still the same :-(
turned her off and walked out the door !!!
let me take this all in now :-)
the fault is in both carbs ? yes because its flooding both cylinders ? pretty conclusive
so if it is a float needle it has to be both of them ? yes , seems pretty not likely do yous not think ? the bike was running good before I stripped it down last year , do yous think the carbs laying off didn't do them any good ? I only have a couple of options now ,, I pull out the jets and put her back to standard (btw I forgot to say I removed the 4 jets tonite also and checked they were the rite ones and not way out on sizes etc) I could try this and it will rule out the jets fault , or I order a pair of float needles ! I don't mind doing this at all (just have to wait on them )

Last edited by kensshadow : 04-28-2016 at 06:35 PM.
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Old 04-28-2016, 08:10 PM   #9
fastdadd
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have you looked at the float height...it sounds like they are too high and not closing
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Old 04-29-2016, 03:48 AM   #10
kensshadow
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Quote:
Originally Posted by fastdadd View Post
have you looked at the float height...it sounds like they are too high and not closing
I'm not sure on how or what the measurement should be ! Again it's unlikly that both would be out ,,, I did operate the float with the bowl off the carb and seems to close at a likkly enough place , the tab an all looks straight and the same on both,
Carbjetkits have been in contact with me (they are very quick !!) I gave them a link to this topic and they are shocked at the amount of fuel in the inlet valve chamber, they say that the fuel must be running straight through the carb ,i (we) have decide to order a pair of new float needles and flat seats , so hopefull that sorts it out , thanks again guys !!!
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