what do you think of getting a metrakit 70cc big bore kit and just rejetting the carb on my own? Does anybody know what jet specifications i should use on a derbi atlantis bullet with the metrakit 70cc big bore kit? Is there anything else I should be concerned with?
thanks so much
> > Hi guys,
> >
> > While I was away this summer I let my brother ride my
> 2003
> > Derbi Atlantis Bullet. My brother let the oil run out and
> I
> > think the engine seized! Therefore, i put more oil in it
> > after it seized. I then rode the scooter about 4 blocks
> and
> > the scooter seized again.
> >
> > 2 hours later, I tried starting it again by kick
> starting
> > it started. However, I did not ride the scooter for fear
> of
> > doing more damage. Any ideas on how to fix this? Would
> an
> > option be upgrading to a 70cc kit be a cheaper route
> than
> > replacing the current engine? How much do you think
> repairs
> > will cost? Please any info would be appreciated. If you
> > could tell me the what parts and where to buy them from
> > would be great
> >
> > thanks a bunch. Currently transportation-less
>
> If the oil reservoir ran out of oil, the oil pump needs to
> be bled to get the air out. This is probably why the engine
> seized again. Drain the fuel tank. Premix one liter of gas
> with oil, about a 2% ratio of oil to gas to lubricate the
> engine. Disconnect the oil feed hose at the carb manifold.
> Start the engine and let it idle. Run the engine till a
> steady flow of oil comes out of the hose and reconnect the
> hose. Fill fuel tank with clean fuel to dilute the fuel/oil
> mixture or drain the tank of the fuel/oil mixture before
> refilling.
>
> Usually once an engine seizes, the damage has already been
> done. A quick check if you don't want to bother with
> bleeding the oil pump is to just add the oil to the gas
> tank to premix in the same 2% ratio. Run the engine. If it
> seizes again the engine will need to be rebuilt. A complete
> engine tear down would be needed to determine the damage and
> required replacement parts.
>
> 70cc rebuild is the way to go, but you will need to also
> upgrade exhaust, drive train and carb jetting. Expect to
> pay at least $500 or more. Derbi parts are harder to get
> since Piaggio bought out Derbi. There are many after market
> cylinder kits available. Check out Polini, Malossi, and
> Metrakit to name a few. Best of luck with your repair.
>
>
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