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Post by 4ce on Mar 2, 2020 21:22:59 GMT 1
Drilled the brass balls out of carbs. tried to poke a straightened paper clip through with no joy.
put them in the ultrasonic tank and tried again with no joy.
I am right in thinking there should be a hole through to where the emulsion tubes were?
If so what should i use to clean these out?
Thanks
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Post by steve h on Mar 2, 2020 21:27:05 GMT 1
Soak in some solvent like carb cleaner. It's only a small hole, don't think you'll poke anything down it
I have known paint thinners being used to soak the carbs in, not tried it myself and I guess it will wreck any plastic or rubber...
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murp
Drag-strip hero
Posts: 239
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Post by murp on Mar 2, 2020 21:27:15 GMT 1
guitar string, or a bristle from a wire brush should be ok, and yes the hole should extend to where the emulsion tube is located
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Post by midlifecrisisrd on Mar 2, 2020 21:34:40 GMT 1
I use a carb cleaner aerosol with a straw on it to check it's clear.
You can see the jet spray in when it's clear
Steve
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Post by shaunthe2nd on Mar 2, 2020 21:37:24 GMT 1
A paper clip will be too thick to go through. Take ball out, ultrasonic clean and then use a bit of fuse wire. As others say you should be able to blow through some cleaning fluid.
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Post by 4ce on Mar 2, 2020 21:40:04 GMT 1
Thanks lads will try some carb cleaner
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Post by JonW on Mar 2, 2020 23:20:34 GMT 1
dont look too closely at it when you spray, if it spurts back of doesnt flow straight you'll get it in yer eye and that wont go well.
But yes I use carb cleaner too.
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Post by doohanno1 on Mar 2, 2020 23:26:12 GMT 1
Here is what you should see when the brass ball comes out..A tiny hole that a couple of strands of copper electical wire will pass through...hth   |
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Post by Dixie Dean on Mar 3, 2020 9:15:32 GMT 1
Hi do you have to put another brass in there to replace the one that you can have drilled out?
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Post by shaunthe2nd on Mar 3, 2020 10:02:25 GMT 1
Yes, you need to reseal with a new brass ball ideally. If you didn't drill all the way through the original ball you could reuse but for the cost of a new one it's not worth it in my opinion.
Or you can tap it out and put in an M5 brass grub screw which makes removal much easier next time.
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Post by Dixie Dean on Mar 3, 2020 10:04:51 GMT 1
A bit thick her what’s the idea behind the bras ball?
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Post by midlifecrisisrd on Mar 3, 2020 10:26:04 GMT 1
A bit thick her what’s the idea behind the bras ball? When the carbs are made they can't drill round corners so they drill from one angle then another and meet up The ball blanks the drill hole If the ball wasn't there the air circuit would be drawing from the air flow at the carb rear, not the still air from the float bowl vent Steve |
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Post by Dixie Dean on Mar 3, 2020 12:06:41 GMT 1
Ok thanks
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Post by 125lc1dt on Mar 3, 2020 16:05:16 GMT 1
I’ve seen this issue raised several times. What are the actual symptons if these hidden passages ways are blocked ?
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Post by shaunthe2nd on Mar 3, 2020 21:10:01 GMT 1
Bike will probably rev under no load but will struggle when running on the road to pull the revs. Depends how much blocked.
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Post by muttsnuts on Mar 3, 2020 22:18:40 GMT 1
the air corrector jet is only 0.50mm on the 350 and 0.80mm on the 250, so it needs to be very thin wire to poke through it, be careful not to open the hole bigger if you poke something through that is abrasive as that can affect your air/fuel at low rpm
HTH
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Post by dalmahoy on Mar 20, 2020 7:46:32 GMT 1
Can anyone give me a idea on what brass balls need drilled out?
I can see the one alongside the needle jet as in the picture.
Am I right is saying there is one other that needs drilled.
Asking because my bike has a terrible flat spot/miss fire approx 4-5k revs where the fueling moves from pilot to main jet.
Cheers
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Post by stusco on Mar 20, 2020 8:04:01 GMT 1
Can anyone give me a idea on what brass balls need drilled out? I can see the one alongside the needle jet as in the picture. Am I right is saying there is one other that needs drilled. Asking because my bike has a terrible flat spot/miss fire approx 4-5k revs where the fueling moves from pilot to main jet. Cheers The ball is 4.5mm diameter if that helps rdlccrazy.proboards.com/post/373745 |
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Post by dusty350 on Mar 20, 2020 8:29:22 GMT 1
This is an Rd400 carb, but it's the same sized brass ball as the Lc/Pv - 4.5mm  20200101_161003 by dusty miller, on Flickr Drill a hole - you may need to carefully centre punch the ball first - then wiggle the ball about before trying to ease it out. Dusty  |
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Post by dalmahoy on Mar 20, 2020 10:53:57 GMT 1
So there's two in total needing drilled out per carb?
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Post by midlifecrisisrd on Mar 20, 2020 10:54:55 GMT 1
So there's two in total needing drilled out per carb? No, just the large one Steve |
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Post by loudy on Mar 20, 2020 16:10:03 GMT 1
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Post by dalmahoy on Mar 22, 2020 20:28:06 GMT 1
Removed the carbs today - l/h carb has no brass ball fitted - r/h carb does! Might have found the problem. s.amsu.ng/GHRDN7HKWO8N |
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Post by dalmahoy on Apr 1, 2020 7:45:18 GMT 1
Question - is Araldite still the best adhesive to use for gluing in the brass balls?
Cheers
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Post by shaunthe2nd on Apr 1, 2020 8:13:51 GMT 1
Araldyte should be fine, only use a little as you don't want to clog up the passage you have just cleared.
I sometimes use a drop of threadlock or loctite.
If you use a new brass ball of correct size you would probably be ok with nothing, but like you I always put a drop of something in to assist to seal it.
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Post by beardy on Apr 1, 2020 9:03:49 GMT 1
I used Gorilla 2 part epoxy resin. Only because that’s what I had in the garage. But similar to araldite
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Post by 4l04ever on Apr 1, 2020 13:59:17 GMT 1
What length M5 grub screw would be best if you wanted to use those instead of a ball?
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Post by shaunthe2nd on Apr 1, 2020 14:26:06 GMT 1
What length M5 grub screw would be best if you wanted to use those instead of a ball? M5 x 5mm long. I have a couple spare if you need any Rob, just PM me your address and I will drop them in the post. |
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Post by bernardo on Apr 1, 2020 14:51:44 GMT 1
And just to hijack the thread, where can I get replacement balls and what size do I need
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Post by shaunthe2nd on Apr 1, 2020 15:41:50 GMT 1
4.5mm diameter brass balls. Plenty on eBay, again if yr stuck I may have a couple spare if you PM me your address.
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