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Warkton Tornado No.1 wrote:Out of interest, does the Mikuni carburate well with the set up? Presumably your choice of Mikuni may be down to personal preferences, involving experience, brand loyalty etc, but did you also look into compactness by comparison with any viable alternatives?
vegansydney wrote:Warkton Tornado No.1 wrote:Out of interest, does the Mikuni carburate well with the set up? Presumably your choice of Mikuni may be down to personal preferences, involving experience, brand loyalty etc, but did you also look into compactness by comparison with any viable alternatives?
I've been using Mikuni TM24s for around a decade as they're a small, Japanese-made flatside. I've found them to be super responsive and affordable. They can be purchased for as little as $115 (~£85). Jets are also wildly available. They use 30mm ID mounting rubbers so PHBL manifolds (GT manifolds being the odd exception!) can be utilized. The only downside I've found is slides and atomizers are slightly harder to find (not all Mikuni suppliers carry the entire range), but that said, I've had no trouble getting what I need by shopping around. Personally I'd prefer the fuel inlet to be on the RHS, but it's only a very minor issue.
I've regularly heard people complain they could never get TM24s set up right. This, I believe, is due to them using the stock atomizer (454 Series Q0). In my experience, atomizers need to be richer (454 Series Q3 or Q4), and slides leaner (4.0+), than what the TM24 come with from the factory. For piston-ported set ups with Clubman type exhausts, I've found (unsurprisingly) that pilot jets need to be smaller (10, 12.5, 15). All of these recommendations are at odds with most of the recommended jetting set ups available online, but I've verified through multiple jetting runs with a wideband UEGO sensor and complemented with plug chops.
I did toy with the idea of a Polini 24mm PWK clone when I found the TM24 wouldn't fit the GT 25mm manifold. I like that the PWKs are so compact, but the issues with float bowl setting, fuel flow and chrome flaking off slides on the PWK clones (Polini, OKO, Stage 6, Koso, unbranded etc..), along with the added investment in jets made me reconsider the TM24. For a larger displacement engine (or different tune) I would consider a genuine Keihin PWK 28. If there was a genuine 24mm made by Keihin I'd seriously consider it, but for now I'm not interested in PWK clones (licensed or not).
vegansydney wrote:Nice work. Great to see it will fit!
I originally calculated that the manifold needs to be moved ~7mm forward for it to fit, but the looks of your picture it could be closer to 5 or 6mm. Please post some photos when you've finally fitted it. Thank you
For jetting piston-ported engines I've found that 454 Series Q3 or Q4 atomizers and slides of 4.0+ are needed. I've not jetted mine yet (still waiting on the frame to come back) so I'd be interested in how you get on. I've never had a problem using 30mm (PHBL) rubber manifolds on the TM24s.
Warkton Tornado No.1 wrote:With many engine configurations, removal of the barrel complete with 'U' pipe can become impossible with engine in situ due to the splash plate.
Last time the issue reared it's ugly head, I made another splash plate from an old recycling bin lid (black plastic) & made it removeable. I hot-air-gunned it to bend forward, rather than back, made it a bit deeper & symmetrical about the centre line.
Warkton Tornado No.1 wrote:With many engine configurations, removal of the barrel complete with 'U' pipe can become impossible with engine in situ due to the splash plate.
Last time the issue reared it's ugly head, I made another splash plate from an old recycling bin lid (black plastic) & made it removeable. I hot-air-gunned it to bend forward, rather than back, made it a bit deeper & symmetrical about the centre line.
vegansydney wrote:Niiice work! Are you going to run a filter? The fact that the TM24 (and TM28) can fit GP/dl 150/200 air hoses are just another reason why they are such a great little carb.
Wish they fitted with that much room without the 8mm packer. If you want to convert that manifold to a flange type, send me a message and I'll get some more flanges laser cut.
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