Today's solex maintenance ...

[SLOroadster]

Garm and I have been talking back and forth and he brought up a good question that I couldn't answer. What about messing with the inner venturis? I've considered doing this, but I've never been able to source anything other than what I already have for inner venturis. It seems like this could be another tuning option that is overlooked. Any thoughts?

Will

[spl310]

Unless I am mistaken, there were different inner venturis available at one time, but they would be hard to find now.

[SLOroadster]

Unless I am mistaken, there were different inner venturis available at one time, but they would be hard to find now.

Yes, I've found part #s for them, but I can't seem to find anyone with them.

Will

[spl310]

What did Todd at Wolfcreek say? Isn't he the North American dealer for all things Mikuni?

[SLOroadster]

What did Todd at Wolfcreek say? Isn't he the North American dealer for all things Mikuni?

I have no faith in that guy. Apparently he doesn't even have any #8 Jet blocks and is now only using OA jet blocks that don't work in anything but 50 mm or type 2 carbs. If he doesn't have #8 jet blocks (the most common ones made) I doubt he has inner venturis. He doesn't list them either.

Will

[Gregs672000]

I've done some research but don't find any postings where people have tuned the car via the inner Venturi. There are 3 available at about $40 each for a Dell. As a result of this search I did come across some more info on how to adjust the pump rod to get max flow without the linkage hanging up, which was the problem I experienced, so I appreciate that this topic has continued.

[SLOroadster]

I figured I'd post a couple pics of the different Mikuni Jet blocks for quick reference.
Left to right, #8, OA and OB.

And from the top


Its funny, this thread has been referenced by guys from the Japanese Nostalgic car forum as well. There is a ton of good info here.

Will

[notoptoy]

Great post Will, this is a great thread, though it goes over my head every now and then and I have to wade through it. I want to try to get a handle on the Mikuni's before I tear into the set I have ready to go on my H20.

[SLOroadster]

Ok, I have another set of pics to add. I'm thinking these are a set of drilled out OAs or OBs, but I'm not sure. Has anyone else seen a set of Mikuni Jet blocks like these? They came in a Hakosuka from Japan, in a set of type 5s. There are no identifying marks on them.




I've never seen a set like this. The other possibility is that they are the "O" blocks that from what I understand are mythical creatures. I can't even find the source that mentioned them at the moment. The Mikuni manual doesn't list them.

In looking a these ones and comparing them to my OA/OBs they would have had to have been machined smooth to drill the holes in them removing the hump that the OA/OBs have. I've never seen them before.

Will

[Down under 311]

Pictures not coming through ??

[SLOroadster]

Pictures not coming through ??

I was wondering if that would happen. Ok, let me re host them. I guess I can't link pics directly from my email.

Will

[SLOroadster]

Lets try these pics.



Will

[Down under 311]

How does the bleed tubes work - or dont they have them ???

[spl310]

I know a couple of local guys that were BIG into the old Honda Civics - the early 70's ones. They had Dellortos on them and would buy LOTs of jets and emulsion tubes. With some number drills and a pin vise, they would modify them to make them run better. Yes, they ruined a bunch, but in the end, they had some stormers.

[SLOroadster]

How does the bleed tubes work - or dont they have them ???

These don't have bleed tubes. It looks like the holes down the side act as bleed holes. The car these came out of has a big stumble and I'm guessing this is the reason why.

Will