Mikuni 40's

Tech tips and how to's

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CSP311
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Mikuni 40's

Post by CSP311 »

I have come across a pair of Mikuni 40's, how can you tell if they are correct for the roadster? I see things like type Q on conversations here.... it has the Mikuni sticker with 21100-88236 with a google are for a Toyota. Were they specific for the Toyota, or they fine for the roadster, as in the same type (Q)

Yes, I know they will fit physically..
1965 Nissan Silvia (CSP311) for total restoration
1978 260Z finally on the road (Rebello 3.2L)
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Gregs672000
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Re: Mikuni 40's

Post by Gregs672000 »

Dave Premo will likely know, but as far as what's "right" for a Roadster, they all work pretty much the same. It really is more a matter of figuring out linkage, venturi sizing (at least 34mm for a U20) and jetting. As you said, they should bolt right up. Should work well to 7000rpm.
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spl310
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Re: Mikuni 40's

Post by spl310 »

You will likely have to jet them and figure out the linkage, but they will work fine
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Re: Mikuni 40's

Post by JT68 »

Yes, they will work. Dave will have the parts for rebuild and jetting, we should have the
necessary linkage.
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Re: Mikuni 40's

Post by Datsunparts.comInc »

I have some nice new foil stickers for those here: https://www.datsunparts.com/2127

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Re: Mikuni 40's

Post by CSP311 »

Thanks all.
Yes Dean, I had your stickers stored in my brain (somewhere) for future use..

Seller has a pair of 40 PHH-2 which look like original BMW mid-1960's fitment, but those would work too with jetting...
1965 Nissan Silvia (CSP311) for total restoration
1978 260Z finally on the road (Rebello 3.2L)
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Re: Mikuni 40's

Post by spl310 »

Can anyone tell me what the stickers for the type Q (Type 2) Mikuni carbs would look like?
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Re: Mikuni 40's

Post by SLOroadster »

CSP311 wrote: Sun Sep 26, 2021 5:01 am Thanks all.
Yes Dean, I had your stickers stored in my brain (somewhere) for future use..

Seller has a pair of 40 PHH-2 which look like original BMW mid-1960's fitment, but those would work too with jetting...
Are these Mikuni Solex or Solex Phh-2 (Q type) I've never seen 40mm Q type Mikunis. That doesn't mean they weren't made, I've just never seen any. If they are Solex made pHH-2s I think I'd hold off until I found some Mikuni made carbs. The Solex carbs aren't that great.

Roadsters never came with 40mm carbs. Will they work? Sure. The 1600s did have a Nissan Comp MIkuni intake for 40s, but I'm pretty sure those were the type 4 Mikunis, not the type 2s (Q type) They never (as far as I know) came from the factory with them installed. Only the 2L came with Mikunis from the factory

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CSP311
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Re: Mikuni 40's

Post by CSP311 »

Thanks Will.
They are the Solex, not the Mikuni Solex. If they fit, so be it, if not, its a restore and sell back as original equipment (not for the roadster). They were cheap, so worth it from that point of view.
I don't intend to go Solex/Mikuni for my engine build, just they happened to pass and I grabbed, both lots as a restoration project on the side.

I will post some pics for interest/reference when they arrive...
1965 Nissan Silvia (CSP311) for total restoration
1978 260Z finally on the road (Rebello 3.2L)