Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: davidrsmith on September 25, 2016, 08:48:50 PM
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Hi
I'm trying to refit my carbs on my K3, I have fitted the air box to the back of the carbs, however I am finding it extremely difficult to get the carbs onto the inlet port stubs, is there a good lubricant I can put on the stubs or on the inside of the rubbers that won't damage the carbs?
Anyone got any good advice on this one?
Many thanks
Dave
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Try heating the rubbers with a hair dryer or hot air gun (not too close or hot with the latter!) and possibly a water based lubricant such as KY jelly, DO NOT use Vaseline or other petroleum based lubricants ie grease, oil, WD40 etc
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If they are that tight buy new rubbers, it will make it a lot easier
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http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9
Thought these look good even if you only want the clips
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http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9
Thought these look good even if you only want the clips.
Heard some bad reports on Cruzinimage rubber parts Rich
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I use a different method, I unbolt the alloy manifolds from the head an fit them to the carbs first using a heat gun to soften the rubbers. It is then possible to slide the assembly in as a unit and bolt them back up.
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http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9 (http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9)
Thought these look good even if you only want the clips.
Heard some bad reports on Cruzinimage rubber parts Rich
I got the Cruzinimage intake rubbers for the 350F. Just had to take the carbs off as its running really rich and noticed the rubbers are already cracking. They have done a total of 120 miles.
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http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9 (http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9)
Thought these look good even if you only want the clips.
Heard some bad reports on Cruzinimage rubber parts Rich
I got the Cruzinimage intake rubbers for the 350F. Just had to take the carbs off as its running really rich and noticed the rubbers are already cracking. They have done a total of 120 miles.
Glad you are backing me on that Roy ... I was thinking it was just me that was of the opinion that they are sh*te on rubber parts. Imagine if that was a camchain roller or guide !
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I thought the previous reports of Cruzinimage rubber parts being sh*te applied more to internal rubber parts (rollers, guides) but it seems there is more to it than that. You live and learn .... Better to find out now than later, as Roy has done.
I see DS have four genuine rubbers in stock (http://www.davidsilverspares.co.uk/CB550K3/part_5392/) so perhaps get them while you can!
They also sell a cheaper pattern set of rubbers but no stock right now anyway.
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I thought the previous reports of Cruzinimage rubber parts being sh*te applied more to internal rubber parts (rollers, guides) but it seems there is more to it than that. You live and learn .... Better to find out now than later, as Roy has done.
I see DS have four genuine rubbers in stock (http://www.davidsilverspares.co.uk/CB550K3/part_5392/ (http://www.davidsilverspares.co.uk/CB550K3/part_5392/)) so perhaps get them while you can!
They also sell a cheaper pattern set of rubbers but no stock right now anyway.
550F3 ones at £6.90p each, wish they sold genuine 750F2 rubbers for that price. Snap their hands off whilst they are there. Come to that the genuine 350F rubbers are £23.10p each that's going to be about £100 for 4 delivered. Ouch.
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I think I have a nice soft Genuine Honda set you can have ... thought they would fit my 500K0 but they didn't so bought Genuine NOS then found a nice soft 500 set too. If Rich, RGP 750 is reading this do you want the 500 ones they are used but nice?
Yours for the postage.
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Was that to me Ash or the 550F3.
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Was that to me Ash or the 550F3.
sorry ..for 550 &500/4 Roy ..don't have any 400/4 ones
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http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9 (http://www.ebay.co.uk/itm/74-76-Honda-CB550K-Carb-Intake-Set-4-Intake-8-Clamps-CI-CB550KINBT-/252078323401?hash=item3ab109f6c9)
Thought these look good even if you only want the clips.
Heard some bad reports on Cruzinimage rubber parts Rich
I got the Cruzinimage intake rubbers for the 350F. Just had to take the carbs off as its running really rich and noticed the rubbers are already cracking. They have done a total of 120 miles.
Glad you are backing me on that Roy ... I was thinking it was just me that was of the opinion that they are sh*te on rubber parts. Imagine if that was a camchain roller or guide !
I still haven't had any problems with their rubber bits, they must rummage through and find the best ones to send to me 😃😃😃
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Don't know if mine on the 350 are knackered yet, but spotted external cracks when taking the carbs off. They may be okay inside, haven't checked fully. Will have a good look at weekend and report back.
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I always fit the carbs to the inlet first then attach the air box. I also found a drop of washing up liquid on the finger and rubbed around the rubber helps it slip in without to much resistance.
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550F3 ones at £6.90p each, wish they sold genuine 750F2 rubbers for that price. Snap their hands off whilst they are there. Come to that the genuine 350F rubbers are £23.10p each that's going to be about £100 for 4 delivered. Ouch.
I wonder what the quality of the 'Aftermarket Part' version they sell is like?
They would most likely have fitted these to any rebuilds they did that needed them (having looked at some of the lists of parts fitted to their rebuilt bikes pretty much all parts used were pattern versions) so I would have thought probably OK.
At £38.40 for a set of four that is a lot less than £100, should you need them.
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To be honest Chris, if you look at the pictures of the DSS genuine items they look pretty rough as well. Not sure how these things are constructed so will have a really good look at them come weekend. If they have central reinforcement they may be okay inside.
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550F3 ones at £6.90p each, wish they sold genuine 750F2 rubbers for that price. Snap their hands off whilst they are there. Come to that the genuine 350F rubbers are £23.10p each that's going to be about £100 for 4 delivered. Ouch.
I wonder what the quality of the 'Aftermarket Part' version they sell is like?
They would most likely have fitted these to any rebuilds they did that needed them (having looked at some of the lists of parts fitted to their rebuilt bikes pretty much all parts used were pattern versions) so I would have thought probably OK.
At £38.40 for a set of four that is a lot less than £100, should you need them.
I did ask DS once but he wouldn't give me any tech info and just said 'sold lots never had any returns' so I voted with my feet and ordered new Honda ones from a guy in Italy
My spare 500 ones are winging their way to Rich (RGP750) but 550K3 ones still up for grabs. I think, to work properly these rubbers need to be soft and still elastic, so that the metal clamps can suitably clamp against the carbs/inlet stubs and maintain sealing during extremes of temperature. The Genuine CB750 one I had analysed was found to be made from an enhanced grade of nitrile rubber, that is compounded to give good petrol resistance.
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I was told on here that you couldn't get k3 rubbers. I ordered some listed on eBay and they weren't correct.
Red rubber grease is ok, warming can help, but expect it to take some effort regardless of the assembly order.
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I have had my carbs on and off so often recently I found a easy method but may be hard to describe.
Take off the air filter box and with your pinkies push the filter side rubbers back in to the air box . You do not need to push them all the way through in to the airbox just back so they rotate on the second lip.
This will give you much more clearance for sliding the carbs in and out.
Once you have slid the carbs in which is so much easier now you have some extra clearance you can then pull the rubbers back out of the airbox with a pull/ rotate motion and then fit them on to the carbs
Using this method I can have the carbs in and out in 30 mins without skinning my knuckles or cussing very loudly