Cagiva Mito evo rebuild

[davthegreat]

54794586
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[Frost]

I'd say the damage was too bad to be repairable and that you will need a new barrel. Some places will do you and exchange one. Buying one off ebay is an option but you will need to budget for a rebore as most will need it. Depending on the size barrel you get and what size it is after a rebore you may or may not be able to use that piston.

[davthegreat]

45555555555555555567776877
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[BenR]

You'd be able to send it somewhere like PJME for a rehone & replate but TBH you could probably get a new barrel cheaper these days.
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Current bikes: suzuki RG125UN wolf. Yamaha MT-07

[ms51ves3]

I'm guessing the Mito barrel just has a steel liner. If so, take it to an engineering firm that does re-bores and see what they say.

Options open to you are:

If the damage isn't too bad, re-bore (so you'll have to buy another piston).

If it is past it and can no be re-bored, you could either get a new liner for the barrel or source a better condition second hand barrel.

I'm amazed you are actually considering putting a new piston in a barrel that looks like that. It'll get chewed up. It needs to be repaired properly, not with a dremel.

I'm also surprised that you thought the barrel could have been undamaged when the piston had broke in half.

[davthegreat]

ive looked at prices on pjme and its a good £100 to get my barrel repaired what sort of prices are a new barrel ive seen some being in the £200s......... does anyone on here have a second hand one for sale.
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[davthegreat]

thank you ms51ves3 i was only wondering what if at all it would run with a scored barrel. ok so best bet is to take it to a engineering firm to see what they have to say about it. and will mean having to buy a new piston, is the cagiva mito barrel re-boreable because ive seen people saying that it cant be re-bored as its nickle plate or something or do they not know what there on about ?
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[davthegreat]

i found this on pjme in there re-bore section


https://www.pjme.co.uk/acatalog/Cylinder_Re-Boring.html


so if i send my barrel to them it will cost £25 + vat and the price of a new piston ? thats if cagiva mito barrels are re-boreable
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[cagiva gezzer]

Cagiva barrels are plated (nikasil) and can only be re-plated to restore them as new.

You can re-bore them and fit a steel liner, however steel liners are not as good and you should also fit a piston which matches. (My opinion and experience).

You're original piston is a cheap (matika) one and this is probably why it broke up, so replacing it with another cheap one will result in the same damage.

Save up, suck it up and get an OE (Asso Werke) piston and a re-plate of the cylinder. I've been through enough cheap pistons to know that they're not worth it!
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"because one stroke isnt enough and four strokes waste two"

[davthegreat]

thank you cagiva gezzer so i need to buy a decent piston and (re-plate my barrel ? do you know what sort of price it is to re-plate? and what sort of places will do it.
____________________
1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[Frost]

If you dremmel the damage you will only be cutting deeper into the cylinder and making the hole between cylinder and piston deeper.
I think it would actually run, but very badly and you'd probably have another broken piston very soon

[davthegreat]

i see i see, problem now is where can i get a barrel replated ?
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[cagiva gezzer]

Colin from the forum is a good place to source parts.

As linked to above, PJ do re-plating. https://www.pjme.co.uk/acatalog/Cylinder_Re-Coating.html

They do sell cheaper parts, but i've never had them last long enough in my engines.
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"because one stroke isnt enough and four strokes waste two"

[cagiva gezzer]

https://www.pjme.co.uk/acatalog/Cagiva_Mito_125_TOp_End_.html
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"because one stroke isnt enough and four strokes waste two"

[davthegreat]

thank you very much for you help ill see what i can do
____________________
1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[steven_191]

try stan stephens too for replating.

the nikosil coat is very thin and you would probably have gone through that, but if you send it to stan stephens for inspection he may be able to weld up the damage then replate, but im not sure if thats a good idea for a few reasons.

if your that worried i would buy a cheap second hand barrel and get it replated anyway.



how did that damage happen anyway? looks really bad and the piston looks like really shit quality. sorry to say but ive never heard anything good about mitaka pistons.



good luck with the build though

[ms51ves3]

[cagiva gezzer]

PJ Engineering offer to upgrade the piston to a better brand when you buy a makita topend.......

Its a budget piston that should only be used in a restricted bike which isn't thrashed.
____________________
"because one stroke isnt enough and four strokes waste two"

[davthegreat]

hi again,
sorry about what has happened to my previous posts above. ill try sort them out.


i have a question though

will any cagiva mito barrel fit mine the evo model mito ? so will a Mk1 shape mito barrel fit a evo (ducati) look mito ?

here is the barrel will it fit ?

https://www.bikechatforums.com/files/mito_barrel.jpg
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1st (derbi senda 50)
2nd (mito which is in bits )
3rd (kawasaki kh125 "83")

[cagiva gezzer]

Not that one above.
____________________
"because one stroke isnt enough and four strokes waste two"