Carb seal kits

[RickOliver]

Hi, Blair

I would definitely be interested in buying a batch of carb kits if they could be done for a reasonable price as my potential supplier has fallen through.

I can send you OE kits as patterns if required.

Please mail me off forum ricknc30@gmail.com or give a ring eves/weekends on +44 1603 720387 if you`d like to discuss further...

Rick

[speedy231278]

Yes I would by a set!

I found this pic. So what happens after you pop the nut off that throttle shaft? Must be something holding the shaft in the body, apart from the butterfly, if the shaft is not removable.

The other end of the shaft is flattened, it can't be withdrawn from the carb body. I can't remember if rvf carbs are constructed the same way.

I'm 90 miles away from my spare carbs at the moment, but I can tell you that on the #1 carb at least there's a circlip next to the body where the shaft comes through. I think the end of the shaft is flattened to locate the balancing tab on the end of it in one side, and the other side of this particular one has the throttle pulley on it which is held on by a nut . Again, I think it's a flattened job to keep it in place. Supposedly my current carbs are worn in this area which is why I'm refurbing my spare set for the bike, though I'm convinced there's a little bit of play in this one too. The shaft must come out, after all, it went in, so all that can stop it getting back out would be modification to the shape after it is installed. Even if a little grinding is needed in order to restore the profile of the rod to permit it to be removed, surely it's not beyond reason that everything can be fitted back together again? My biggest concern would be making sure the screws holding the butterfly were properly peened over again, and didn't get eaten by the engine!

[Maelstrom]

Please note that I have edited this post as I was previously incorrect to state that the JIS recess angle was different to that of the ISO 7047/DIN 966.

@Speedy
Sounds like it can be removed. You usually have to grind the existing stake off with a dremel or similar. Put the new ones in with Loctite 243 on the screw thread should be fine and stake them if you want. Like all these cross head screws on Japanese machines they are Japanese Industrial Standard (JIS). You must have a JIS screwdriver, in this case a number #2. A phillips screwdriver will not work. Despite all the posts that you see saying that these screws are rubbish they are actually very good if you use the correct tool. It would behoove the user to stop for a moment and ask themselves the question "Am I smarter than Honda Motor Corporation?". You can put a lot more torque through them than is possible with a phillips. Phillips are designed to cam out whereas you can strip the thread when using a JIS. The difficulty is finding them. I will have some in soon for my carb kits, but I had to buy 3000. I have only seen phillips screws sold for this application on the web. A phillips screw, ISO 7047 or DIN 966, has a head diameter of 5.6mm vs the JIS of 6mm. Does this matter? Since I intend to supply screws, I will supply the same as original. You are free to use whatever you like.
The next issue is the seal. The mikuni carbs use a custom size so once again have to pay for moulds and small production runs, ouch! I would really like to get hold of the Honda shaft seal so I can find a replacement or have them made. If someone can help me out here then I would appreciate it. Free carb kit for you.
cheers
Blair

[Maelstrom]

On another note. Thanks to the interest and correspondence with Rick Oliver, I am proceeding with these Honda kits now. Lead time is about two months. Suzuki just went to the end of the queue.

[krisztian_andre]

How about this: http://www.motorcyclecarbs.com/FELT_CV_ ... 03C680.cfm
What's the throttle shaft diameter and the housing ID?

[Maelstrom]

Yes, thanks for your input. I have seen that website. Their double sided seal is interesting. It might come in handy if you were contemplating running a blow through supercharger. There is also another business called SCI that sells them too, but you can buy the genuine ones for about $2. I don't know what size Keihins use or the style, but one would assume from that advertisement that they are the same size as the Mikuni. That would be good news for me.

However, whether they charge $2 or $6 is moot because they will then charge you $30 to $80 for shipping. One US firm that I tried to buy some genuine o-rings from quoted me $82 to send to Thailand. I sent them an image of the US Postal Service charge for that, which was $2.65. There response was, "company policy". Which, along with the fact that you cannot buy a comprehensive kit for the Yamahas, is what prompted me to make these kits in the first place. All I wanted was some seals and O-rings and it turned into a huge saga. I guess if I just shelled out $300, like I am supposed to, then I would have nothing to complain about.
cheers

[speedy231278]

Not sure what family the VFR uses, but the RVF uses Keihin VP carbs, so according to the part listing, they won't be suitable for that. I'm not sure if the carbs that are going to come off my bike will be suitable for measuring stuff if they really do have wear, and I'm not willing to start ripping the spare ones to bits to find out, just in case I ruin them! I'd be happy to investigate the old ones however, as one day the new ones will wear out and it would be handy to be able to refurb a set to be sealed like new....

[Maelstrom]

As you said Speedy it is just a shaft. Not rocket science. When do you think you would have time to check out these old ones?

[krisztian_andre]

Yes, thanks for your input. I have seen that website. Their double sided seal is interesting. It might come in handy if you were contemplating running a blow through supercharger. There is also another business called SCI that sells them too, but you can buy the genuine ones for about $2. I don't know what size Keihins use or the style, but one would assume from that advertisement that they are the same size as the Mikuni. That would be good news for me.

However, whether they charge $2 or $6 is moot because they will then charge you $30 to $80 for shipping. One US firm that I tried to buy some genuine o-rings from quoted me $82 to send to Thailand. I sent them an image of the US Postal Service charge for that, which was $2.65. There response was, "company policy". Which, along with the fact that you cannot buy a comprehensive kit for the Yamahas, is what prompted me to make these kits in the first place. All I wanted was some seals and O-rings and it turned into a huge saga. I guess if I just shelled out $300, like I am supposed to, then I would have nothing to complain about.
cheers

The idea is to order new parts, fit them to the carb to confirm it's the right part and then order similar parts from a manufacturer using the new part as a pattern. Custom manufacture is too expensive most of the time so you'd have to go with the nearest thing.
From what I found, when they repair throttle shafts that don't use a seal (I'm not sure if the NCs use them) they usually fit bushings and new shafts like this: http://www.google.com/url?sa=t&rct=j&q= ... Mw&cad=rja
Which parts are still missing from your kit?

[speedy231278]

As you said Speedy it is just a shaft. Not rocket science. When do you think you would have time to check out these old ones?

To be honest, not for a month or so. My bits will allegedly get shipped next Monday, but it will be quite a while before I have a free weekend to swap the carbs over. I've got other commitments most Sundays for a month or so now, and as I only go back 'home' on occasional weekends, I can't afford to have something go wrong on a Saturday that would affect Sunday at very short notice! I'm literally looking at November before I can set upon it in anger now...