Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: philward on November 01, 2021, 01:56:32 PM
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Just bought a Keyser carb kit for my 500k2 to try to cure mid range hesitancy (following recent post by Erny solving similar issue). Bought at £112 a set from Wilson Racing via eBay - bought from UK company at top of price range to try to avoid 'fakes'.
When they arrived they were in Keyser branded clear plastic bags but no Keyster branded cardboard boxes (as per previous kits I have bought)
How have members received packaged Keyster kits?
If I contact the seller and ask if they are not genuine, he is unlikely to say so!
I might just ask for a refund.
Thanks in advance
Phil(https://uploads.tapatalk-cdn.com/20211101/b8732472bcafa0072f453da7e85b8748.jpg)(https://uploads.tapatalk-cdn.com/20211101/274f148f8f2a38a0c02fb35ef9b57436.jpg)
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Don't know Ken. Used all original brass ware plus Julie's seal kit. Had new floats, quality float valves. Triple checked float heights. Bench synched and on vac guages.
As Erny highlighted his emulsion tubes were corroded and sorted his hesitancy issue by using Keyster kit, thought it was worth a try (had good results using Keyster kits on 750's)
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Middle slot I think - got carbs off in readiness for receiving Keyster kit so will be confirming when I strip
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Not got them out yet (strip down scheduled for tomorrow) but thought it best to replace then everything has been changed with quality parts based on Erny's experience. (Also, my 750k2 is on Keyster and has always run a treat).
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I presume the K2 is still using 627B carbs?
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The US model does apparently
Going to give the Keyster a try based on my previous experience and Erny's feedback - main issue is if they are genuine
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Thanks Ken, I'll let you know whats happening
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Bollox. Just fitted refurbished 069A with 40#, 100#. Am i goosed?
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To my 1973 k2…. :-\
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I also posses a set of 627B with 100# ‘ 40 #. Do I need to swap them back?
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That PDF was provided in a post on here by someone else - from another site. so can't vouch for its authenticity
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I bought Keyster kits from DS a few years ago and they came in Keyster cardboard boxes and the plastic bags.
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That PDF has been composed by me. A few thoughts. Although my carbs have served over 138.000 kms, I have no indication of any wear so far. Each float valve has passed around 2000 liters of petrol. My 649A carbs are stock. No parts have been renewed other than the O-rings around the main jets and the bowl gaskets. Even the O-rings around the T-joints are still the originals Keihin installed in the 70s. For experimental reasons - curiosity - I have raised the jet needles one notch, from 3rd to 4th from top, just to be able to evaluate the setting mentioned in a booklet edited in 1977(!) by American Honda. I still have my doubts; that US booklet is the only source that suggests '4th' for the CB500 and it may well be an error derived from an error in the Shop Manual CB500-550 p.165, where Honda mistakenly typed CB500 over the left column, where it should have been CB550. If one day I have nothing better to do, I may return my needles to their original 3rd (middle position) again.
I didn't know needle jets could corrode. They're brass and what has been interpreted as rust, may well be dried out leftovers from petrol. Needle jets can be cleaned quite easily with grandpa's pipe cleaner. Note that the 'F' models had a differently tapered jet needle than the 'K' models had.
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Thanks Gareth, I messaged the company via ebay earlier and they replied that they send them this way so they can send via envelope postage and said he can send pictures/numbers for the kit boxing - and I have requested that in my reply.
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Thanks Gareth, I messaged the company via ebay earlier and they replied that they send them this way so they can send via envelope postage and said he can send pictures/numbers for the kit boxing - and I have requested that in my reply.
👍
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Phew…thanks oddjob.
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How to I identify the carb type (ie 649A carbs) - is it somewhere on the carb body?
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Yes. Stamped on the manifold end.
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Yes, it is stamped in. See pics. We think it is safe to assume the 627B, 649A, 022A, 087A and 069A carbs are identical and only differ in jetting.
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FM. An entire carburettor mystery cleared up for me.
The carbs are the same, the stamping just denotes the jet sizes and settings. Entirely logical when you think about it. Thanks deltarider.
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Yes, it is stamped in. See pics. We think it is safe to assume the 627B, 649A, 022A, 087A and 069A carbs are identical and only differ in jetting.
Thats great - thanks
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Thanks Ken, will check tomorrow
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Hi, Oddjob.
My comment was a question rather than a statement. We got there in the end though. It’s aLl very confusing for a newbie like myself, but comforted to know that the carbs are essentially the same, but with different jetting.
Just a little unsure now whether to retain and restore the 627Bs on the K2 or stick with the restored 069A units (100#; 40#) I’ve fitted. It also appears I have the correct 069A 98#:38# on my F2, which is a relief.
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[...]
Not exactly correct, there are very small differences in some of the air vent sizes and air bleeds but they are not worth bothering with imo, mainly done for emission testing by the yanks and to suit the 4 into 1 system better. [...]
Can you be more specific? I have no source for that.
Phil if the bike was from somewhere in the states with thin air, like Denver for instance, the needle clips could have changed to accommodate this, always worthwhile checking.
A difference in the position of the jet needle is a difference in jetting, which will be expressed in a different stamped in number. Unless you know of exceptions ofcourse. It may be that the position of needles is changed in areas with thin air, but then, I take it, this has been done by local dealers after delivery.
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Just re-assembled the carbs with all new Keyster parts - starts and ticks over fine but havn't had time to road test yet to see if hesitency cured (although starts much better).
But! I seem to have misplaced one of the zinc plated circular blank off the carb body (at top of carb). Probably find it in corner of garage in a few years!
Has anybody got a scrap carb that they could take one off and sell me? Carb is 627B Type
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This is the one(https://uploads.tapatalk-cdn.com/20211107/c2600247589c1e67f78bd26db710033b.jpg)
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Just re-assembled the carbs with all new Keyster parts - starts and ticks over fine but havn't had time to road test yet to see if hesitency cured (although starts much better).
But! I seem to have misplaced one of the zinc plated circular blank off the carb body (at top of carb). Probably find it in corner of garage in a few years!
Has anybody got a scrap carb that they could take one off and sell me? Carb is 627B Type
Just seen this thread. Interested to know if you have had a proper test ride and whether it has solved the problem. I have been through the same journey myself and only fixed everything when I realised the needles and emulsion tubes have to be matched, i.e. come from the same source as the pattern ones will be subtly different to the originals. Good luck!
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Can't give a definative answer yet Charlie - since fitting the Keyster parts, it starts better but have only done about 20 miles and although all seems fine' didn't have many opportunities to roll it on in the mid range under load (where the problem was) due to traffic.
Will update when I've more info