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novadose2009
23-10-10, 11:12 AM
hi i have just bought a 01plate cagiva mito 125 evolution and it lasted one day then head gasket and top end went on it. i have bought all new gaskets piston kit small end bearing ect. All i need now is a replacement barrel but i cannot find any anywere and not buying a new one.

Any one had one of these before or no of any good parts suppliers ect

thanks
satchellm
23-10-10, 11:23 AM
Do You Defo Need A New Barrel Or Could You Get Away With It Being Honed? I Had One,loved It. I Jacked The Oil Pump Up A Little Done 16000miles In 18months And It Never Missed A Beat Sorry I Know That Doesnt Help Much.
MattBrown
23-10-10, 11:26 AM
Do You Defo Need A New Barrel Or Could You Get Away With It Being Honed? I Had One,loved It. I Jacked The Oil Pump Up A Little Done 16000miles In 18months And It Never Missed A Beat Sorry I Know That Doesnt Help Much.

Hone through a nikosil lining? :roll:

You need to send it to grampian motors in Birkenhead, then can put a cast iron sleeve in the barrel, and this will eneable 3 rebores also.

To do that much damage, there must be a serious problem, my guess is oil pump, cheap oil, or riding it like a tool from cold.

Be prepared to put £130 into a barrel, and what make of piston have you bought?
Lee-1984
23-10-10, 11:27 AM
hi i have just bought a 01plate cagiva mito 125 evolution and it lasted one day then head gasket and top end went on it. i have bought all new gaskets piston kit small end bearing ect. All i need now is a replacement barrel but i cannot find any anywere and not buying a new one.

Any one had one of these before or no of any good parts suppliers ect

thanks

try a bike dismantler, theres 1 in ely, or look in the back of bike auto trader
novadose2009
23-10-10, 11:41 AM
well i thought if i had the barrel rebored then the piston i had bought would then be sloppy and i bought a domed twin piston ring vortex piston kit.
MattBrown
23-10-10, 11:51 AM
well i thought if i had the barrel rebored then the piston i had bought would then be sloppy and i bought a domed twin piston ring vortex piston kit.

Oh no, a sloppy piston? lol

Ok, so what size is the Piston you have bought?

Standard bore?
satchellm
23-10-10, 12:10 PM
[quote=MattBrown]Hone through a nikosil lining? :roll:

quote]

good point must admit id forgotten that! DOOOOH
novadose2009
23-10-10, 12:34 PM
its a standard bore barrel but was 4 different sizes for the piston but all only0.01 of a tho bigger but the 1 they gave me was standard size sent if not specified
Pistol Pete
23-10-10, 12:58 PM
Surely your barrel will have the size on. Cant imagine you need a new one though. I had a circlip snap on me once...scored the barrel a treat. Langcourt saved it. Cost me though lol
novadose2009
24-10-10, 08:00 PM
i think itl be cheaper to get another barrel. would the oil pump be worth checking then?
Lewis.
24-10-10, 09:15 PM
put a cast iron sleeve in the barrel

i'm sorry, but that is the worst advice i've ever heard anyone give on this subject. 2 stroke technology has come on leaps and bounds in the past 40 odd years, and just about reached a peak, with the ultimate setup being a piston and barrel being made from the same material allowing equal expansion rates and therefore small tolerances to be used, thus increasing thermal transfer. mostly made possible with the use of nicosil plating.

so you are suggesting he has a cast iron sleeve fitted, and undo over 30 years of advances in racing technology, and in doing so he has a uneven expansion between piston and barrel, so larger tolerances are needed, resulting in a lesser ability to transfer heat to the water jacket, increased running temperatures, and reduced piston and cylinder life. :wtf: wow, sounds great :roll:

O/P:
some good advice would be to send the barrel to Stan Stephens (http://www.stanstephens.com/index.html), in Kent (arguably the BEST 2 stroke tuner in the UK) who can replate a single barrel for £95, and weld and replate a damaged bore for £125 on exchange basis.
MattBrown
25-10-10, 08:00 AM
i'm sorry, but that is the worst advice i've ever heard anyone give on this subject. 2 stroke technology has come on leaps and bounds in the past 40 odd years, and just about reached a peak, with the ultimate setup being a piston and barrel being made from the same material allowing equal expansion rates and therefore small tolerances to be used, thus increasing thermal transfer. mostly made possible with the use of nicosil plating.

so you are suggesting he has a cast iron sleeve fitted, and undo over 30 years of advances in racing technology, and in doing so he has a uneven expansion between piston and barrel, so larger tolerances are needed, resulting in a lesser ability to transfer heat to the water jacket, increased running temperatures, and reduced piston and cylinder life. :wtf: wow, sounds great :roll:

O/P:
some good advice would be to send the barrel to Stan Stephens (http://www.stanstephens.com/index.html), in Kent (arguably the BEST 2 stroke tuner in the UK) who can replate a single barrel for £95, and weld and replate a damaged bore for £125 on exchange basis.

Its a road bike, not a grand prix bike.

My rs125 had a cast sleeve, and it was exactly the same power as before, and gives you 3 rebuilds and bores before the inevitable.

How the funk do you plan to re-coat a barrel, thats had wear through the nikosil/chromium etc?

You would need to weld all the scores, machine it, then replate it.

£125? That is very, very cheap.
novadose2009
25-10-10, 10:05 AM
should i replace the oil pump also?

and my current barrel is a mitakia performance one and only one i can find is a standard cagiva barrel do u think that would make that much difference in performace as bore sizes are the same.
AlanH
25-10-10, 12:03 PM
join 1255ccsportsbike forum, lookup a guy called collywog and ask his advice, he's a mate of mine and has a lot of experience building and tuning mitos as well as a parts website, he will probably have a good cond. barrel lying round for less than a replate too. have to agree with lewis on the cast sleeve also, avoid at all costs IMHO. there are 4 different pistons, and about 8 different types of barrel for mitos, best trying to get the correct piston/barrel combo due to the fine tolerances these things run.
BongMong
25-10-10, 12:18 PM
Whaaaaaaaaaaaaa it only lasted 1 day.. i would be fuming! my curly whirly will be on the floor..

this happened to mine and had to have all the seals replaced!
L14MNP
25-10-10, 04:28 PM
Can I be the first to say who cares? lol

Kids bikes. Use your car. :)
MattBrown
25-10-10, 04:34 PM
Can I be the first to say who cares? lol

Kids bikes. Use your car. :)

lol lol lol

+rep:d
Lewis.
25-10-10, 06:33 PM
Its a road bike, not a grand prix bike.

My rs125 had a cast sleeve, and it was exactly the same power as before, and gives you 3 rebuilds and bores before the inevitable.

How the funk do you plan to re-coat a barrel, thats had wear through the nikosil/chromium etc?

You would need to weld all the scores, machine it, then replate it.

£125? That is very, very cheap.

no idea how they actually replate the barrel, as i've never had any need to have it done. perhaps you know? you profess to know everything else :roll:

and yes, if there is heavy scoring then they weld the damage, rebore, and plate. as i said in the last 2 lines of my previous post.

if you think its too cheap, then call Stan Stephens up, and say "O hai! i'm matt brown off of PNG, i know more about 2 strokes than you, so stop replating barrels because it can't be done, and you must charge more than you do as well"

and tbh, i dont give a flying **** if your RS has a sleeve, its still a backwards step, even for a 'road bike'. Mito's are in a high state of tune so saying "its only a road bike" is just toss. most 125's are gonne be ridden hard regardless
Pistol Pete
25-10-10, 06:59 PM
An interesting read....

http://www.langcourt.com/page27.html
Sloth
25-10-10, 08:31 PM
fit a different bigger engine.

try an xe...









and speedlines...














and gsi kit.....





lol
MattBrown
25-10-10, 08:35 PM
no idea how they actually replate the barrel, as i've never had any need to have it done. perhaps you know? you profess to know everything else :roll:

and yes, if there is heavy scoring then they weld the damage, rebore, and plate. as i said in the last 2 lines of my previous post.

if you think its too cheap, then call Stan Stephens up, and say "O hai! i'm matt brown off of PNG, i know more about 2 strokes than you, so stop replating barrels because it can't be done, and you must charge more than you do as well"

and tbh, i dont give a flying **** if your RS has a sleeve, its still a backwards step, even for a 'road bike'. Mito's are in a high state of tune so saying "its only a road bike" is just toss. most 125's are gonne be ridden hard regardless


lol

Yup I said I know more than stan stephans.

He has forgotten more about tuning than the whole of this forum will ever know.

He is a ledgend, especially with exhaust designs.

A mito isnt in that higher tune, and also, I read last night that a malossi barrel is differant to standard, and is chromed, with a chrome ring.

Now I have no idea who rechromes barrels, I know grampian motors can re nikosil, but chrome is a no go for me.

And the RS had done 8k with no issues when I sold it, so I must have done something right...