Priming 2stroke oil pump

[Martay]

Hi,
Just rebuilt a 2stroke 50cc scooter and the haynes book says to prime the oil pump, by cranking the engine at full throttle, with the oil pipe off the reed block into a container (plug cap removed) Oil should appear from the pipe, continue until free of air bubbles.
Following the instructions, but no oil comes out, although the tank is full and cap removed.
Is it necessary to prime the pump, if so, can you recommed a better method?
Many thanks
____________________
Eat well, poo hard
Drives: Cavalier 2.0 16v
Rides: Slightly ratted Honda City Express

[Billing]

You have to crank it for quite a while if the system is dry, you using the electric or kickstart? I remember the TZR being a right pain to do, took ages to get the system clear (Y)
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
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[Martay]

Yeah, using electric starter. Im a bit worried about cranking it without an oil supply?
I tried sealing the pipe from the air compressor into the cap of the tank, to blow the oil through, it just made a horriffic mess! oops
Il try it again tommorow, cranking it over...
Ta
____________________
Eat well, poo hard
Drives: Cavalier 2.0 16v
Rides: Slightly ratted Honda City Express

[ben350]

If you look at the pump itself there should be a drain bolt (usually a philips screw) that you can remove to allow 2T oil to flow from the tank down to the pump - when you see oil and no air bubbles screw it back in.

What I would do next is add a little 2T oil to say 1/2 a tank's worth of petrol and run the bike at idle with the reed inlet blocked off (so no air gets sucked in). Then with the bike idling and getting lubricated by the pre-mix you can simply hold the pump pulley fully open and then pump will bleed a lot quicker with the engine not at risk as its getting oil / petrol.

When done re-connect the pipe to the reed block and check for leaks - fill up the petrol tank and you're done - the bike will smoke a wee bit more than normal on that tank but as long as you did'nt go crazy with 2T oil it's fine.
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Ducati 996 Biposto
Suzuki Goose 350
DT125R Supermoto (Project)

[Martay]

That sounds like a plan!
Il do that after work tommorow. Need to test run it after a top end rebuild, so killing 2 birds etc.
Many thanks

____________________
Eat well, poo hard
Drives: Cavalier 2.0 16v
Rides: Slightly ratted Honda City Express