MBK ovetto 50cc problem

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

hi all i have just been given a non runner ovetto by a mate of mine. i have stripped it all back to the basics, i have seen it has got a good spark, but im not sure if fuel is getting to it, i have been trying to kick start as the electric start does not work, and it seems that it does not want to start at all!!

any help and replys would be very much appreciated

p.s.. i have been reading on the web and i have come across something called a cdi, would that control the fuel?

thanks
chris

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

think i have traced the problem back to the fuel tap, so got a new one ordered for Wednsebury.

there seems to be another problem with the electric start. when i press the start button in nothing happens, what are the chances of it being the starter motor?

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

right ive sorted the electric start problem.

still got this fooking problem with it not starting, ive put a new fuel tap on it so there is fuel now getting to the carb, put a new spark pug and ht cap on and still nothing. after about 10 minutes of trying to start it i thought ill take the plug out and clean it as it would be covered in fuel, so i take it out and its still bone dry....WTF.

could somebody please help me

p.s it seems to have very good compression

connornrg · Scooby Slapper Joined: 05 Jul 2010 Karma :

Have you tried fresh fuel?
Is petrol entering the carb? (open the float bowl, if petrol pisses out then yes petrol is entering carb.
Are the jets blocked?(whilst float bowl open unscrew the jet, commonly brass in colour and in the middle of the bowl)
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Lipsmoker · Trackday Trickster Joined: 22 May 2010 Karma :

I've used to have a Neos 50, the same as the ovetto

Take off the carb blow the jets out
while the carbs off under the inlet manifold is a reed block two Allen screws take that off you will see little petals hold the block up to sunlight and make sure you cant see ANY sunlight coming through.

A Compression tester could be useful too sticking your thumb in the plug whole is never accurate.

On the right hand side of the scooter you will see a little vent cover take off this cover and you will see your stator the stator will have a little metal strip (this times the spark) make sure the metal strip isn't rusty use some light sandpaper and get any rust off.

Fresh fuel wouldnt hurt either.

As for the Electric start problem i bet you wasnt pulling in the brake was you Wink

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Four wheels move the body. Two wheels move the soul.

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

Lipsmoker · Trackday Trickster Joined: 22 May 2010 Karma :

No worries let me know how you get on
Thumbs Up

____________________
Four wheels move the body. Two wheels move the soul.

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

thomp1983 · Crazy Courier Joined: 05 Feb 2011 Karma :

take the carb off, get some carb cleaner and spray a small amount into the intake stub the carb fit's into, refit the carb then see if it will start, if it starts on carb cleaner then fuels not getting through the carb

chris

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

right then i got the bike back from my local bike shop as i gave up on it.

he said at some point the engine has seized then sort of freed it self and in doing so has left scratches in the barrel, does that make sense?

is the engine completely shagged or can i buy one of these kits and fix it in the link below?

https://cgi.ebay.co.uk/NEW-BARREL-CYLINDER-KIT-MBK-OVETTO-50-50CC-AC-98-03year-/220759056014?pt=UK_Motorcycle_Parts&hash=item336643de8e#ht_5176wt_1139

thanks
chris

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

timsmith · Two Stroke Sniffer Joined: 09 Jun 2011 Karma :

I wouldn't bother to buy a second hand engine from E-bay as there is no guarantee that it is any better than the one you have. Have you taken the head off and had a look at the state of the bore? if it is scored then treat it as scrap. Don't buy a cheap barrel from any old where but one of the uk based specialists from E-bay should be ok. Don't forget to get a gasket set and if you are feeling flush a new little end while you are in there. good luck

Tim

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

right then, iv took the head and barrel off to check whats going on, it does not look good, the piston and the barrel are pretty badly marked (piston ring is still on)

what are the chances of it doing damage to the whole of the engine, and not just the top half ?

thanks
chris

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

do you think i would be better off getting a 70cc kit? as there the only one's i can find that are not chinese made

ill sort a few pictures out when i find out how to upload them

Nope. · World Chat Champion Joined: 16 Feb 2011 Karma :

chris vvc · Derestricted Danger Joined: 03 Jun 2011 Karma :

Brought a new 50cc top end kit that came yesterday. The old man put the rings on the piston as he said hes done a few back in the 70's Rolling Eyes

Anyway he's got them on but they seem loose, are they meant to be gripping the groves tightly?

thanks
chris