i think my cagiva mito has siezed :(

Take the spark plug out take a pic & post it here & I'll tell you whether it's running lean or not.

Don't worry to much though even if you've holed the piston it's no biggy to change out. Stripped & rebuilt my 2 stroke 3 times one week. :p
 
Have you checked the condition if the reed valve? Given that you changed the exhaust it's most probably a jetting issue, but a dodgy reed could be exacerbated by it.
 
you have a good seal around the exhaust at the engine? if not itll suck air in

cant you bring idle revs down by adjusting the idle screw? usually a knob on left hand side

I cant see it needing rejetting,i never had to,but im no mechanic
 
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yep reeds and reed valve fine, carb fine, airbox fine.

i tryed adjusting that knob on the side of the carb but i cant get the bike started again, so i cant really do anything with that yet until it fires up again

any idea why it was idleing at 3500rpm? it used to idle at 1000rpm
 
beasty6 said:
yep reeds and reed valve fine, carb fine, airbox fine.

i tryed adjusting that knob on the side of the carb but i cant get the bike started again, so i cant really do anything with that yet until it fires up again

any idea why it was idleing at 3500rpm? it used to idle at 1000rpm
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The obvious ones are:
Idle adjustment on carb. Throttle cable not seated in carb or twist grip properly. Cable trapped somewhere. Carb slide sticking.

However, the idle will also rise if it's running lean, so check for blocked pilot jet, air leaks around carb and reed valve or you could have a leaking crank seal (which would give poor primary compression). Any of these would make it hard to start.
 
found out the problem guys, i checked the compression with a tool that my neighbor has, turns out that its only pushing out 75psi instead of 110psi, so it now needs a top end rebuild as well.

damn it, knew it would come to a rebuild, i have not got the time to do it atm and i need it running again asap, is there anywhere i can get it rebuilt and set up? i would prefer to send it to a well known 2stroke re builder, again who and where?
 
it was running fine before with that exhaust on? then it died?

how many miles has it done,i remember my kmx reaching just 24k before it needed new rings/small end

google stan stevens but he will be expensive,and you want the cylinder nikosil plated don't let them re sleeve it
 
well i was abit suspicious about the top end for a few days, was running fine but it started to make like a clunking sound, but the exhaust was getting worse so i thought it was that, it needed replacing anyway,

so it must have already giving in then the new exhaust just topped it off lol, i already have and he only dose bigger classic engines now, ive found a place that specializes in mito's, they are called mito mondo, going to give them a ring tommorow
 
when you did the compression check did you have a fully charged battery, and have the throttle fully open?

its normal for a 2stroke to need a new barrel and piston. id expect you to pay between 2 and 400 for the kit. very easy to fit.
 
Well when I bought the bike, it had been sat for 7 years do I'm going to get a complete engine rebuild, tbh, i dont think it's even been rebuilt in the past.

I gave mito mondo a ring today and he's on holiday until the 14th.
 
My father wants to have it off me when I'm finished with it as he wants it as a collectable, so he's paying for the re build as he wants it done anyway, just got to find a decent sports bike to fit A2 requirements, and it's not going very well atm :(
 
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