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Post by grumps on Mar 2, 2015 18:22:38 GMT
Is there a simpler way of balancing the carbs other than using a set of vacuum gauges?
I don't particularly want to shell out on a set just for the odd time I need to sync the carbs. Or does anyone know where I can hire a set?
Thanks
David
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Post by silverdave on Mar 2, 2015 21:15:37 GMT
Hi
I used lengths of plastic tubing fixed on a board to make a manometer when I had a BMW twin, never tried it on 4 cylinder bike (although its the same principle)but only takes you longer to do it
Dave C
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Post by spike240 on Mar 2, 2015 21:15:56 GMT
Hi. I'm no expert, but I seem to remember someone (CD?) Describing a way of balancing by ear.
Maybe he will see this thread and let us know.
When I have done my carbs, I have been able to borrow a twin set of gauges. It is possible to do a 4 cylinder bike using these, but is much simpler with a 4 gauge setup.
Atb
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Post by grumps on Mar 3, 2015 7:59:42 GMT
I used to do my Mini carbs years ago by ear...I reckon they were never very good!!!!  I'll nip down to my locak bike shop today and ask them for a price. |
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Post by kirriepete on Mar 3, 2015 9:47:40 GMT
As silverdave says up above, bit of tubing on a board with some ATF does the job. It's Sunday name is a Differential Manometer and it is very accurate as it shows the difference between carbs, not any absolute value, so if the levels match it's job done. Here's mine:  How to use it on a 4 cylinder bike? Balnace carbs 1&2, the 3&4, finish by balancing 2&3. Bit more of a bother than doing all 4 at once, but with a set of Morgan Carbtunes going at about £60 and a tube onna stick costing less than a fiver to make, as Kevin Bacon says "No brainer". |
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Post by grumps on Mar 3, 2015 16:37:19 GMT
Food for thought!
ATF as the liquid = think I've got some of that
Looking at your pic do I assume the top (open ends) of the tubes go to the two carbs? Vacuum in the pipes 'pulls' the ATF one way or the other so you balance till they are level?
Thanks for the tip
David
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Post by crickleymal on Mar 3, 2015 16:59:57 GMT
You're not a million miles from me. I have a digital air pressure meter with balanced inputs. Put the plus to one carb, the minus to the other and adjust for minimum difference. I've used it to balance carbs before now.
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Post by kirriepete on Mar 3, 2015 17:10:41 GMT
Yes David, that's just how it works, here's a video I made a while back of it in action on the nephew's chinese thing:
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Post by grumps on Mar 3, 2015 17:13:10 GMT
Mega---thanks
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Post by silverdave on Mar 4, 2015 19:31:23 GMT
Hi
I started to use a manometer to balance the carbs after I returned from the BMW dealer after a major service with the bike running "lumpy".I took the tank off to investigate only to find that the mechanic had nipped a fuel pipe between the tank and the frame. So much for a test run, investigating a little further showed a plastic cover missing off the top of the fork yoke. When I returned the bike they told me it was missing when I brought the bike in and charge me £0.75 for a replacement, (the "service" was in the hundreds of pounds). I have never set foot in the door since and that was 15years ago.
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Post by grumps on Mar 4, 2015 19:38:09 GMT
I was quoted £45 to balance the carbs by my local shop. For an extra few quid I can buy some gauges. Still thinking about the DIY tip above  |
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Post by m40man on Mar 4, 2015 20:34:25 GMT
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Post by grumps on Mar 4, 2015 20:41:42 GMT
Lol...I have plenty of empty boxes!! |
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Post by m40man on Mar 4, 2015 20:45:43 GMT
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Post by grumps on Mar 5, 2015 8:46:46 GMT
So far, two boxes and one Twinmax - choices, choices.  Keep the ideas coming! |
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Post by sledgegreen on Mar 8, 2015 13:26:29 GMT
How to use it on a 4 cylinder bike? Balnace carbs 1&2, the 3&4, finish by balancing 2&3. I don't think this is right - if you do things in this sequence, balancing 2&3 means that you are forced to adjust one of those carbs out of sync with the carb you originally synced it to. 1&2 will be balanced first, and then 3&4 will be balanced, but those pairs might be quite far apart. So, if you adjust 2 to match 3, you will have 2,3&4 in sync and 1 out of sync. Similarly, if you adjust 3 to match 2, 1,2&3 will then be in sync, and 4 out. The way I was taught was to sync the two central carbs firs. Once done, don't change the adjustment on those two, but adjust each of the outer carbs to one of the central carbs. Because 2&3 are already in sync, the outer carbs are then then both brought to the same value. |
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Post by crickleymal on Mar 9, 2015 10:46:54 GMT
6 of one and half a dozen of the other. There are individual carb adjusters and also an adjuster to balance the pairs, hence doing 1/2, 3/4 then 2/3. Certainly that's the way I've done it in the past.
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