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Post by JonW on Aug 24, 2015 23:18:05 GMT 1
Asked this in Advice, but its getting buried and I was hoping to get on these carbs today, so any help would be appreciated, ta! ...I need to check some things on a set of 4L0-01 carbs: 1, I think the answer is that this is correct, but I wonder about the two ovals on this set of carbs, one had a brass tube and a closed off passage, the other has no tube and no closure. Is that how it should be?  2, I assume the missing large brass ball on the top is correct? its the same on a set of 31k carsb I have...  3, I found a spare small brass ball in the bottom of my ultrasonic cleaner when I was finished cleaning these... Any idea where its from?  This is the side by sides of my set of carbs:        4, what needles and jets were fitted to the 4L0 carb? Im thinking its a 1K5 or similar... but has anyone use 4N10? I also assume 22.5 and 220 and the P345 nozzle? |
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Post by jon on Aug 25, 2015 8:02:21 GMT 1
Jonw, I must say the pictures confused me at first, trying to imagine left or right carb, and right way round.
I think I have worked out why, is your choke on the right carb? I thought they were on the left but haven't got time to check this morning.
If it is then 1) the brass tube in the float bowl is to the choke circuit and should have the bowl with the jet in attached.
2) I also have functioning carbs with this ball apparently missing.
3) Not really sure, although could it be someone has lost the slide locator and put this in instead? Couldn't see it on one carb in the photos.
4) 4N-10 needles are to an RD250LC. Check out 350.net for jetting.
Lastly they won't be fitted today unless you have the brass autolube spigot, or block them off and tank mix.
Jon
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Post by sp885 on Aug 25, 2015 8:39:57 GMT 1
Jon
My 350LC is running 22.5 pilot jet, 220 main jet and P345 emulsion tube as you have listed, all standard I believe for a standard spec bike, I'm using 5K1 needles, I got all this stuff from Norbo, couldn't get anything here mate
Steve
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Post by JonW on Aug 25, 2015 9:08:23 GMT 1
Thanks guys! ive answered some of these on my own but your help is greatly received. So, in reply after a busy day of internet and looking at all the Mikuni carbs I have (from all sorts of machines in all sorts of stages of decomposition lol): 1, I agree this is the choke circuit. From what I can see on these and other carbs the main parts of this system are in the body, the bowl has the cast in tube and almost at the bottom of the bowl it either has a drilling or not, this allows the fuel to flow into the circuit when the choke knob is pulled, this was the explanation I found online:  So... As I dont have the correct bowl I drilled a just under 2mm hole so fuel now can enter the tube that's cast in the bowl. Anyone else ever done this, or am I the only one? 2, I agree, Ive looked at lots of carb pics and seems they all look like this. phew! 3, The slide locators are there, thats my picture taking skills that show it poorly, sorry. Still baffled that I dont have a home for this ball, I hate having extra parts! 4, Yep I agree I need 5K1s. Anyone have a good set of spares they wont use? And Jon gets the extra prize for noticing the autolube has been pulled out, Ive aleady glued it back in  |
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Post by JonW on Aug 25, 2015 9:12:26 GMT 1
Jonw, I must say the pictures confused me at first, trying to imagine left or right carb, and right way round. I think I have worked out why, is your choke on the right carb? I thought they were on the left but haven't got time to check this morning. Jon, The carb with the choke is on the left in the lighter pics. But it would be on the left on the bike, sorry for the confusion, these are defo 4L0-01 carb bodies, so should be the same as any 350LC... I hope!  |
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Post by wwwRD350LCnet on Aug 25, 2015 9:15:16 GMT 1
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Post by JonW on Aug 25, 2015 10:36:10 GMT 1
Thanks Xavier, I should have said I looked in my manual earlier, but its good to know yours lists the same info as the one I have, must be the same settings the world over on these. |
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Post by JonW on Aug 28, 2015 0:18:25 GMT 1
A gentle bump as this is a bit messy now, but I'm still seeking answers to:
1a, As I dont have the correct choke side bowl, I drilled a just under 2mm hole so fuel now can enter the tube that's cast in the bowl to flow up into the choke circuit. Anyone else ever done this, or am I the only one?
3a, whats the small ball for, can you see where its missing from in my pics? or are there some inside that are hidden?
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Post by muttsnuts on Aug 28, 2015 8:00:28 GMT 1
Hi Jon, must have missed this post 1a. 2mm s too big, its more like 1mm, or maybe even 0.8mm, anyway, it should be ok, will probably not need choke very long that's all as it will flood it 3a. I suspect that little ball is from the hole you have mentioned already, there are no internal balls to worry about (there is only one and your's is in the right place on the right carb !) and looking at your carbs your balls are all in the right place externally as well , I suspect somebody has just plugged that hole with a ball and its come out, as long as the choke side carb has both brass balls in place you will be fine. To check, just look inside the carb to the roof of the venturi, you should see 2 small holes which correspond to the brass balls, sp long as the carb with the ball missing doesn;t have a hole inside then its fine if its missing Hope that makes sense |
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Post by JonW on Aug 28, 2015 8:58:56 GMT 1
Cool Cheers for the resp Mutts! I think the hole was just over 1.5 actually, it was a 1.5mm drill. I agree with you its not a huge issue to have it larger, just not as ideal as it could be I guess. Cheers for the correct sizing tho, I could always seal it up and re drill or just drill the other bowl and fit that if its a problem I guess Thanks for checking me balls  Tis appreciated. Im starting to think the ball could have come from my 31k carbs... they were last thru the US cleaner before these, hmm... |
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Post by bare on Aug 29, 2015 4:39:55 GMT 1
Seriously Mate!
Spend Large and BUY a Brand New Pair of Keihin 28mm PWKs
Yes Not Free.. but they work SOOOO much better than crapped out poorly designed Mikunis.
A purchase you will Not regret.
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Post by JonW on Aug 29, 2015 13:08:53 GMT 1
haha too funny bare, I actually have a set of PWKs here, but... Im building a resto bike so trying to put all original parts back on |
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