Cagiva Mito conversion to 250 TZR

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Hi all, some pics of my Mito 250 build. With a bit of tuning it should hit 60-70 hp.

I stripped the bike to individual parts and then had the main parts all dipped, stripped, blasted then powder coated.



I used an RS 250 cup rear shock from ohlins. I had to alter the top mount. I will have this rebuilt and valves / sprung to my weight.

I wanted twin discs on the front although the 250 engine isn’t any heavier than the mito 125. I used twin mito discs on a duke 916 wheel. Ohlins gsxr k2 ohlins front suspension and k2 callipers.



The engine is mounted on billet mounts and has a billet inlet manifold that will allow much bigger carbs as the tzr is quite restricted by the standard ones.



Added a set of carbon side panels along with a carbon light bowl from a 916 and I have carbon infil panels.

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This is my 125 mito that I built up from a box of bits.

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Evolved said:

That’s amazing mate. Always loved the MITO, a mini Duke. Should go well with that setup! Work looks top notch as well.

Thanks, yes they share a lot with the Duke. I believe Cagiva owned Ducati.

I had a cr500 engined one and that flew…similar peak HP but lots more torque (and vibrations)

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Turn7 said:

Thats lovely, and a great idea for the conversion.

I had some great rides on Stinkwheels...

Stink wheels….love it.

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I am 6ft and long in the leg and I fit quite well.

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I recognise the 350.

I have a ypvs converted Mito frame but need an engine for it.



Here is the one with the CR500 engine I just sold. And my one with the 350 ypvs engine in it before the engine was removed.

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My 350

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Yes, the RS250is bigger but a good one is very expensive now.

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podman said:

Thats just cracking mate, love it .

Thank You, glad you approve.

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Decky_Q said:

Damn you, the Mito is one of my favourite bikes and now that the idea of an rs250 engine swap is in my head I expect I will be losing garage space and a wad of cash with another project!
The 2 stroke rs250 is carb fed yes?

Yes, carb fed.

You need to use the 1KT side by side TZR engine, not sure how the RS250 would work - also doesn't the RS250 have the chain on the "wrong" side or is that only the 125?

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Little update today - fitted a new Ducati master cylinder (brembo), new braided brake line and then bled it up with the new pads.

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Birky_41 said:

Caddyshack said:

Yes, the RS250is bigger but a good one is very expensive now.

I paid £7,200 for my '99 MK2 with 10,500 miles. Its in good but not great condition

That sounds on the cheaper side. I would expect to pay £10k for a mint one with a fresh engine (Ish). It is easy to spend £5k to £8k building a refurbished mito with a bigger engine but I have built my ones out of partial bikes and 2 I came to own by accident. I find building them up over 12 months doesn’t feel like a cost whereas buying a bike for £7.5k is noticeable.

I think your RS will hold its money very well.

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Yes, need to rubber mount big thumpers.

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Marquezs Stabilisers said:

Fastdruid said:

There was even the Yamaha SRZ 660 which was a factory "special" basically being a TZR125RR fitted with a XTZ660 engine... From all accounts it was terrible.

On the subject of shaking themselves to bits I do remember a long time ago way back when there were a variety of motorcycle magazines there being a special featured in one which used an old British parallel twin in an RS250 or RGV250 chassis (it was a long time ago, I can't remember which one now). I bet that thing would shake your fillings out!

A British twin would be grim but a Honda CB500 liquid cooked twin...

I know a chap with a cb500 in one…people berated him for going 4 banger but I can see the appeal.

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Wiring nearly finished. I just need the zeeltronic to arrive now.

I have used the mito switch gear and spliced what is needed to run the TZR in to that. The Yamaha past masters racers use a cut down loom so I used one of those.

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Twin lectron carbs should mean it is easy to dial in- no messing with jetting.

The inlet is a custom billet to allow for the bigger carbs and rd350 / banshee reed cases. It positions the carbs higher up and it needs that to clear the engine.



The inlet has an internal cross over link with an o ring to seal it.



Ducati 916 light bowl in carbon and clocks wired in and mounted…just need to tidy the wiring once the new clock bulbs arrive.



Rev counter is aftermarket to work with the 250 engine. I have got all of the warning lights fitted. Just nee to find room for a shift light at 12,000 rpm.

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Re trimmed the rear seat

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I bought some tuned expansion chambers for a tzr 250 from Len at Merlin, he thinks these will be good road pipes, his engine dyno showed a largely standard engine made 58hp at 10,500. I have added tyga tail pipes.

I had to make a few mods to get them to fit the mito and then weld on some mounting points etc. they might need a tiny bit of alignment but happy with them.

Just waiting on the opposite Lectron carb to arrive from USA. I have wired in the zeeltronic and will build a base map then it’s off to the dyno for setup.

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Trial fitted some fairings off my 350 ypvs mito and I think I can get more fairing on this bike so will order some from Germany. These ones had a big cut out for the ypvs clutch and also for the pipes.