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Post by shergar on Feb 28, 2021 21:46:31 GMT 1
looking for the correct jetting /needle clip position / float height for fitting 31k carbs to my 4l1 250lc please if anyone has any help it would appreciated it , cheers
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Post by Tobyjugs on Feb 28, 2021 23:37:47 GMT 1
Shergar you need to post some information about which exhaust system you using and air intake etc
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Post by shergar on Mar 1, 2021 0:01:23 GMT 1
Shergar you need to post some information about which exhaust system you using and air intake etc Bike is totally stock mate |
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Post by Tobyjugs on Mar 1, 2021 23:28:33 GMT 1
I have a 250 running withe the carbs you mention although a different set up, I would try;
220 main jet
25 pilot
standard needle and emulsion tube
You might have to go up or down on the main jet. This is basically my set up But i have pod filters so my main jet is 400 i think and the needles are raised one above standard as it is a little lean when driving away from standstill. Now the weather is warming up its getting better,
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Post by 4l04ever on Mar 2, 2021 11:22:55 GMT 1
Standard 350 (4L0) settings would have a 22.5 pilot, 220 main jet. Not far from Tobyjugs settings. The smaller pilot might work better with standard airbox.
Once up and running, probably best to get the fuelling checked on a dyno to get a bit closer.
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Post by shergar on Mar 2, 2021 18:42:52 GMT 1
iv tried std set up 220 and 22.5 but stalling at 4k to 6k badly.. so went to 190 and 20 as per mutts nutts recommended to start with still the problem at 4/5k to 5/5k but defo better takes off from stop perfect and hits 5.5k perfect so what should i move to now ye recon..needle at 4th should i move this to 3 also as im using 31k carbs and needles/emulsion tubes do i need to change these also to suit 250 ? ta
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Post by shergar on Mar 2, 2021 18:47:22 GMT 1
I have a 250 running withe the carbs you mention although a different set up, I would try; 220 main jet 25 pilot standard needle and emulsion tube You might have to go up or down on the main jet. This is basically my set up But i have pod filters so my main jet is 400 i think and the needles are raised one above standard as it is a little lean when driving away from standstill. Now the weather is warming up its getting better, sorry tonyjugs but when you say std needle and emulsion tube do you mean the 31k std or the 250lc std mate ? ta |
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Post by Tobyjugs on Mar 2, 2021 22:40:01 GMT 1
iv tried std set up 220 and 22.5 but stalling at 4k to 6k badly.. so went to 190 and 20 as per mutts nutts recommended to start with still the problem at 4/5k to 5/5k but defo better takes off from stop perfect and hits 5.5k perfect so what should i move to now ye recon..needle at 4th should i move this to 3 also as im using 31k carbs and needles/emulsion tubes do i need to change these also to suit 250 ? ta I did this and it was worse i ended up fitting the standard 31k emulsion tubes and needles back. My bike was also weak when driving off similar to yours i ended up lifting the needle higher and turning the pilot air screw in to try and add more fuel at the small throttle settings. |
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Post by shergar on Mar 2, 2021 22:50:14 GMT 1
so you went to 5th on the needle with the clip correct ? my pilot is set at 1 and 1/8 out so you went to 3/4 ish yes ? my plugs are staying black/wet at the moment but i havent done a plug chop yet .
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Post by Tobyjugs on Mar 2, 2021 22:59:10 GMT 1
I went from the 3rd groove from top if you count down from the top of the needle to the 4th groove. This improved things a little. After that i screwed the pilot screw from 1.5 turns out to 1 turn out. My plugs are a nice rich brown colour. Don't forget i am using Pod filters on the 250.
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Post by shergar on Mar 2, 2021 23:26:06 GMT 1
I went from the 3rd groove from top if you count down from the top of the needle to the 4th groove. This improved things a little. After that i screwed the pilot screw from 1.5 turns out to 1 turn out. My plugs are a nice rich brown colour. Don't forget i am using Pod filters on the 250. I’d say the pods are making a big difference alright mate , I’m at the 4th and bad iv just moved it to 3rd so get it out for a try tomorrow and see . I never cleaned behind the brass balls on the 31k carbs as I can’t get the replacements over here would it be part of this issue if blocked ? |
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Post by Tobyjugs on Mar 3, 2021 17:50:26 GMT 1
Yes it could be, personally i prefer to remove the balls and replace them with a grub screws. I think the problem with this method is people will screw their nose up at it if they don't see the brass balls.
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Post by shergar on Mar 6, 2021 21:21:02 GMT 1
I went from the 3rd groove from top if you count down from the top of the needle to the 4th groove. This improved things a little. After that i screwed the pilot screw from 1.5 turns out to 1 turn out. My plugs are a nice rich brown colour. Don't forget i am using Pod filters on the 250. I’d say the pods are making a big difference alright mate , I’m at the 4th and bad iv just moved it to 3rd so get it out for a try tomorrow and see . I never cleaned behind the brass balls on the 31k carbs as I can’t get the replacements over here would it be part of this issue if blocked ? got her out for a spin today tony in the 3rd position and defo better still a small stutter at the 4.5 to 5k but now when i hit the 7k she is stalling and going on on/off like this can this still be the jetting .. took a plug out and its dryer than it was but is still slightly wet and a hint of brown coming into it . |
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Post by shergar on Mar 6, 2021 23:31:49 GMT 1
I’d say the pods are making a big difference alright mate , I’m at the 4th and bad iv just moved it to 3rd so get it out for a try tomorrow and see . I never cleaned behind the brass balls on the 31k carbs as I can’t get the replacements over here would it be part of this issue if blocked ? got her out for a spin today tony in the 3rd position and defo better still a small stutter at the 4.5 to 5k but now when i hit the 7k she is stalling and going on on/off like this can this still be the jetting .. took a plug out and its dryer than it was but is still slightly wet and a hint of brown coming into it . Also ment to say it needs NO choke at all to start and on first kick so is that another issue? |
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Post by Tobyjugs on Mar 7, 2021 12:03:26 GMT 1
Yes it sound too rich.
Try just dropping one down on the pilot without altering anything else. Hopefully your idle speed will go up slightly.
Or screw the pilot screw 3 turns out to see if it needs choke to start it.
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