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Post by midlifecrisisrd on Mar 7, 2021 14:33:27 GMT 1
I don't think it is getting to the main
If it won't rev past 4k it's way rich
I'd have thought 52 was nearer
Steve
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Post by steeley on Mar 8, 2021 7:58:10 GMT 1
Chris hi , jetting is a bugger had a couple of melt downs over the years . I saw this a couple of months ago , this chap does work on scooters but its the same methodical principle tuning wise . He has a you tube channel and has done work on lcs ect . www.shiny-red.net/guides/keihin-carburetor-jetting/ |
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Post by sidney81 on Mar 8, 2021 8:03:30 GMT 1
Chris hi , jetting is a bugger had a couple of melt downs over the years . I saw this a couple of months ago , this chap does work on scooters but its the same methodical principle tuning wise . He has a you tube channel and has done work on lcs ect . www.shiny-red.net/guides/keihin-carburetor-jetting/Thanks steely I'll check it out 👍 |
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Post by pdxjim on Mar 8, 2021 8:41:12 GMT 1
If you're starting from scratch, you'll want to get the pilots and needles sussed before you spend much time fussing with the mains. I would throw the biggest mains you have in there, and get the idle, off idle and midrange feeling good, then work your way down with the mains til it revs all the way out cleanly. But that's just me, and I've probably been doing it wrong for years  What needles did Dave set you up with, and where do you have the clips? |
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Post by pdxjim on Mar 8, 2021 9:05:45 GMT 1
I should add, you’re in good hands with Martin77.
I believe I’ve got the only set of his pipes in the states on my TDR
A friendlier, more helpful fella would be tough to find.
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Post by sidney81 on Mar 8, 2021 9:06:00 GMT 1
If you're starting from scratch, you'll want to get the pilots and needles sussed before you spend much time fussing with the mains. I would throw the biggest mains you have in there, and get the idle, off idle and midrange feeling good, then work your way down with the mains til it revs all the way out cleanly. But that's just me, and I've probably been doing it wrong for years What needles did Dave set you up with, and where do you have the clips? morning!! I think there jjh ? The clips set in the middle ,it idles well but when you ride it it's spluttery and boggy it won't rev past 4 k ,then I go down on the pilots and it won't even run off choke ! I'm a little out of my depth really as I can't tell between rich and lean really ,I know cutting out is lean but that's about it , |
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Post by pdxjim on Mar 8, 2021 9:13:35 GMT 1
morning!! I think there jjh ? The clips set in the middle ,it idles well but when you ride it it's spluttery and boggy it won't rev past 4 k ,then I go down on the pilots and it won't even run off choke ! I'm a little out of my depth really as I can't tell between rich and lean really ,I know cutting out is lean but that's about it , JJH or N68A are generally considered the ones you want. I’d suggest you drop the needles/raise the clips to #2 and see If it gets better or worse Pilots are 50s now? |
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Post by sidney81 on Mar 8, 2021 9:59:35 GMT 1
It's on 52 s at the moment , Martin is very helpful to 👍
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Post by midlifecrisisrd on Mar 8, 2021 13:36:27 GMT 1
With foam filters I'd have said n68's were needed
JJH is usually for using with the airbox
Steve
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Post by sidney81 on Mar 8, 2021 13:46:08 GMT 1
With foam filters I'd have said n68's were needed JJH is usually for using with the airbox Steve Worth getting a set Steve ? |
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Post by midlifecrisisrd on Mar 8, 2021 14:28:52 GMT 1
If you can find a set yes
I don't think they are causing your problem but on LC and YPVS 350's they help it runn smoother in the mid throttle position off the pilot jet
Steve
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Post by sidney81 on Mar 8, 2021 14:30:50 GMT 1
If you can find a set yes I don't think they are causing your problem but on LC and YPVS 350's they help it runn smoother in the mid throttle position off the pilot jet Steve Ok ,I think it's my jetting the issue and me not knowing where to go with it !! Could the float height's be a problem?? |
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Post by midlifecrisisrd on Mar 8, 2021 14:35:10 GMT 1
If it's too high then yes
Can't remember pwk float height off the top of my head but 19mm rings a bell
It may well be the wrong bell though 🤣
Steve
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Post by sidney81 on Mar 8, 2021 14:42:28 GMT 1
If it's too high then yes Can't remember pwk float height off the top of my head but 19mm rings a bell It may well be the wrong bell though 🤣 Steve I'll check them Steve ,it's really wet at the pipes it's coverd my wall in oil |
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Post by muttsnuts on Mar 9, 2021 0:20:20 GMT 1
float heights will be fine, they are brand new carbs.
I've just not been available much these past few weeks to help Chris.
It really needs to go on the dyno for analysis as its a bit of a one off, so base settings are a bit hard to gauge TBH
The mains are 138's I think,the pilots started at 35's. if your on 52 pilots at the moment, and the lean throttle from idle is gone, then they are about right, but it sounds like the mains are too big if its struggling to go past 4k and its spluttery and spitting petrol out.
I'd be trying some 125 mains and seeing how it goes, the 28mm PWK's pilot affects the main jet circuit, so the extra fuel being thrown in by the pilots will be too much with the 138 mains would be my guess
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Post by sidney81 on Mar 9, 2021 7:20:48 GMT 1
float heights will be fine, they are brand new carbs. I've just not been available much these past few weeks to help Chris. It really needs to go on the dyno for analysis as its a bit of a one off, so base settings are a bit hard to gauge TBH The mains are 138's I think,the pilots started at 35's. if your on 52 pilots at the moment, and the lean throttle from idle is gone, then they are about right, but it sounds like the mains are too big if its struggling to go past 4k and its spluttery and spitting petrol out. I'd be trying some 125 mains and seeing how it goes, the 28mm PWK's pilot affects the main jet circuit, so the extra fuel being thrown in by the pilots will be too much with the 138 mains would be my guess Hi Dave ,no problems at all I know you have other things going on , thanks for the info I have some smaller mains in the way to try so I will know in a few days , I hope to book in to the Dyno , your 4 hours away from me so me and the misses might book a travel lodge stay the night and make a trip out of it 🙂 |
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Post by sidney81 on Mar 15, 2021 21:01:49 GMT 1
Hi everyone something still not right ,I mentioned it's very wet at the back well I took the pipes off and oil / petrol ran out of them ,I don't get it I would run off choke because it's lean on the pilots yet it's filled the pipes up ,unless the main was far rich and was flooding it , any ideas really getting fed up with it 😔  |
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Post by midlifecrisisrd on Mar 15, 2021 22:28:47 GMT 1
That's veeeeeeryyyy wet 🤔
I've only had it that bad twice
First was on a bog standard bike with standard carbs and no matter what I did it wouldn't run right until I fitted different carbs. It seemed to be way rich on the main
Second time was a DT125lc and it was solved by changing the stator
Steve
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Post by sidney81 on Mar 15, 2021 23:44:16 GMT 1
That's veeeeeeryyyy wet 🤔 I've only had it that bad twice First was on a bog standard bike with standard carbs and no matter what I did it wouldn't run right until I fitted different carbs. It seemed to be way rich on the main Second time was a DT125lc and it was solved by changing the stator Steve Hi Steve ! Yess definitely very wet I'm lost now it has to be very rich somewhere or the float height's possible ,? |
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Post by midlifecrisisrd on Mar 16, 2021 9:25:51 GMT 1
Float fuel level being too high will be like it is massively overheated
The pair of carbs I binned had problems with fuel level
Setting at the correct fuel height was giving 5mm off extra fuel level
Steve
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Post by sidney81 on Mar 16, 2021 9:46:18 GMT 1
Float fuel level being too high will be like it is massively overheated The pair of carbs I binned had problems with fuel level Setting at the correct fuel height was giving 5mm off extra fuel level Steve I've checked the carbs and the float level is correct ,but like you say maybe that's still to much fuel for the bike !! The carbs are brand new I must add so there not old worn out rubbish ! I will adjust the float height's |
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Post by midlifecrisisrd on Mar 16, 2021 12:15:25 GMT 1
I suppose if they sit at a different angle it can affect things
Open the drain screws and fit some clear tube vertically to look at the fuel level, not the float height in relation to the height of the overflow tube
As mutts says it may just be way over on the main
Try a much smaller main and see what happens
Steve
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Post by sidney81 on Mar 16, 2021 12:47:39 GMT 1
I suppose if they sit at a different angle it can affect things Open the drain screws and fit some clear tube vertically to look at the fuel level, not the float height in relation to the height of the overflow tube As mutts says it may just be way over on the main Try a much smaller main and see what happens Steve Good idea 👍 yes I've got some more mains on the way ! Getting expensive in jets 😱 |
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