Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: johncam on May 23, 2018, 10:49:50 AM
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Hi, has anybody got good experience with a particular set of four carburettor vacuum gauges – my 750 is rattling like a goodun and from what I understand carb balance can be a primary cause. There are plenty of kits out there with varying reviews from £40 up to over £100 and a key issue seems to be finding gauges which are well damped and don’t flick all over the place.
Any advice gratefully received!
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John, I have this cheap kit and it works fine.[attachimg=1]
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Just bought a set. 38.95
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Morgan carb tune do rod ones, i have had mine for a long time and have never had any problems with them.
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Have used all sorts including those shown and the nearest to Honda ones are the sealey ones at about £110 and used far beter gauges than the ones in the picture which are not all that accurate
https://www.ebay.co.uk/itm/Sealey-Carburettor-Synchronizer-Vacuum-Mini-Type-Bank-Of-Four-Mini-Gauges/301927858737?epid=8017014200&hash=item464c4d8231:g:6-MAAOSwUUdXDeSN
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Morgan carb tune do rod ones, i have had mine for a long time and have never had any problems with them.
I'd seccond that had a set for a while been spot on
(https://i.imgur.com/7rHvWVW.jpg)
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Morgan carb tune do rod ones, i have had mine for a long time and have never had any problems with them.
I'd seccond that had a set for a while been spot on
(https://i.imgur.com/7rHvWVW.jpg)
Yep, another vote for Morgan Carbtune. Had mine more than 30 years, cannot go out of calibration by virtue of their design, and much easier to watch working than 4 dial gauges while checking/adjusting. ;D ;D
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You can manage with the cheaper dial gauge units shown at the top. They are not brilliantly accurate, ignore the text on the dial, compare the gauges by trying each one in turn on the same cylinder at a few set RPMs, and fiddle with the inline restrictors that damp the movement.
But it can be a little frustrating. If you want less stress and hassel go for the other gauges mentioned here. Think I'd put the Morgans top for value for money/less hassel.
PS: Where is AshimotoK0 when we need him.?
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Tell us where you are John (put it in your profile)
I have an old Morgan Carbtune in my garage that you are welcome to try if you are local.
Steve (Wokingham)
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Thanks all for the great response and advice - excellent1 Steve, very generous offer but I am quite a way from you in Suffolk - thanks again!
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I've used Davida gauges for quite a few years now - I'm in Norfolk (near Watton) if you want to come and try them on your bike.
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The cheap biketek gauges have arrived. What values would I expect to see at idle?
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Every bike will give different readings at idle. What is important is to have all cylinders within 2cm mercury of each other, the closer they are the smoother the idle. That said, no point even getting them hooked up until ALL servicing has been done, Tappets, camchain, ignition timing, engine oil clean and at the correct level, air filter clean or new. Balancing the carbs is a waste of time if the other parts aren't done first.
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The cheap biketek gauges have arrived. What values would I expect to see at idle?
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when you start to use the gauges ,firstly fit the brass tubes ,longer for inner pots ,mount the gauges ,ideally across the handlebars,
,I suggest connecting the 4 hoses to the gauges then cut them about 5" from the gauge so you can fit the white taps ,
just connect all 4 hoses to brass pipes ,and your almost ready to go.
have you a method of supporting the tank well above the carbs ?
so you can ccess the adjusters,,and don't worry to much about the reading,just try to get them almost the same .
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A remote tank as seen in John’s photo is worth investing in, I think mine was £17 from eBay, one of the best 17 pounds I’ve ever spent.
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A remote tank as seen in John’s photo is worth investing in, I think mine was £17 from eBay, one of the best 17 pounds I’ve ever spent.
I second that. The valve on mine is a bit leaky though.
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I'm on a washing up bottle hung from the flower basket hangar with a bungee
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I'm on a washing up bottle hung from the flower basket hangar with a bungee
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Love it. It reminds me of Blue Peter ;D ;D ;D
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When doing the balancing do you use any form of cooling for the motor whilst it's running ?
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Never used to in the workshop, but if everything else was done right first never took too long anyway
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Paul... on my last balancing act, a lovely summer’s day, and bearing in mind I’m no professional, my 750K2 got rather hot (& smelly). On the very next ride out a coil failed - aargh. In my wee mind I’ve no doubt who’s fault it was 😢. From now on I’ll be using a fan across the cylinders for peace of mind...
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I use a large FAN :)
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Fan it is,cheers
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Looking at the reviews I'm edging toward the Morgan Carbtune pro 4 £70 delivered. The syncpro sounds good but much more expensive and the need to calibrate each time is a little off putting.
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I bought the cheaper 4 gauge unit,
in use I don't worry over much about the figures,just try to get all the needles about the same .
works great,and a nice quiet tickover
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Did you need a fan ?
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no.I ran the bike to get it warm,then removed the tank and connected the gauges and mini remote tank,(I think it cost about £4 on Ebay,also needed a Y junction )
it ran OK
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Looks to be a nice set. I have already ordered the Morgan so it will be an idea to compare notes one day. Having never set eyes on any of this kit my learning curve just gets steeper !. Considering I haven't really touched a bike ( other than change the oil , oil filter and air filters ) I'm kinda enjoying getting stuck into the whole maintenance lark. My bank balance has suffered recently but so far my wife hasn't twigged things so all is good.
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I got burned with a set of those on Ebay, but got my money back thankfully. If a deals too good to be true then it usually is. But I still fell for it. :-[
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Sealey, nearest to Honda original made today and a good set, i got some couple years ago.
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Bit like Austin and Morris Ken, same thing dofferent badge! No idea who actualy produces them though.
Used mine more on my mates 1200 wing trike than anything else.
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If the origin is in doubt, it is a good guess at China, they copy most things at 1/2 the price and not necessarily of poor quality
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They are very good, way better than the blue steel backed ones you see
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All the adaptors came on seperate model boards as well!!