Alpha Sports 49cc resurrection

[drphilwv]

Howdy all,
Working on the Alpha Sports 2 stroke I was given recently that I plan to turn around and give away! So I was able to get a lot done today and I have pics and some questions.

I removed the engine and this is the tag/SN. Minarelli clone is what I’m thinking.

This is where the carb was sitting on a fancy manifold. Gonna have to find a gasket set. Everything was loose.

Here is the electric choke carb. Is there a vacuum line from the carb to the fuel petcock that acts as a pump? There isn’t one there but there sure looks like a pump on the tank.

Yeah, that jobby on the right.

Hell is this piece? I can’t figure out there he took this off.

A pic of the 2 stroke oil injection pump. The oil in the reservoir is the right color but really high viscosity. Gonna flush it out and replace. Is there a way to check if this pump works with the bike off? I’m guessing not. I see that the oil flows from the oil reservoir to this pump (in a 6mm line I believe). It then flows away from the pump into a prob 3.5mm line which was not
Attached anywhere. I’m sure I can find a schematic of the oil and vacuum lines somewhere online.

There is a crush type washer on the exhaust. Does this need replaced upon reassembly?

Anyway, the carb was full of rusty fuel so just going to replace it. The air box must be broken or something as there was a piece of PVC in the air box manifold.

I have ordered a full set of fuel lines. I may need to order a new vacuum line or whatever goes to the petcock


Waiting for Godot!

Phil C in the WV

[oldgeek]

Got yourself quite the project there! For starters someone cobbled a 4T carb in there, the scoot will likely reject it. The part in question that has been cut on the tube part is the carb top from the original carb. The oil injection was likely disabled during the carb and throttle cable replacement, lets hope they went to premix.

[drphilwv]

Feb 12, 2019 15:43:28 GMT -5 oldgeek said:

Got yourself quite the project there! For starters someone cobbled a 4T carb in there, the scoot will likely reject it. The part in question that has been cut on the tube part is the carb top from the original carb. The oil injection was likely disabled during the carb and throttle cable replacement, lets hope they went to premix.

Aha! So that explains why the end of the throttle cable was boogered too. So I need to get an original carburetor. Perhaps order a oil injection pump too. And maybe a flywheel puller.

[oldgeek]

You should be able to get a original style carb at a reasonable price. Oil pump is probably fine, but you will need a new throttle cable that has a splitter for the variable oil pump.

Post a picture of the parts you have, a stock airbox would also be a good idea. You might want to try to do a compression test to see how that looks because you may find it needs a cylinder kit too. You have the shrouds for it?

[ryan_ott]

Oil pump can be checked by spinning it over with a supply line installed and primed (small screw on side) flow is very minimal only a bubble of oil every few seconds. The smaller line on the fuel tank should go to a vacuum source. Open up the cvt and check it over and also gear oil, especially since you have it upside down. It tends to leak out the vents. Exhaust gasket can be reused but if your getting a gasket set it usually comes with it.

[drphilwv]

Feb 12, 2019 19:33:57 GMT -5 ryan_ott said:

Oil pump can be checked by spinning it over with a supply line installed and primed (small screw on side) flow is very minimal only a bubble of oil every few seconds. The smaller line on the fuel tank should go to a vacuum source. Open up the cvt and check it over and also gear oil, especially since you have it upside down. It tends to leak out the vents. Exhaust gasket can be reused but if your getting a gasket set it usually comes with it.

Spinning it with the cable pull or do I need to remove the flywheel and get to the rotating end of the pump?.

Wasn’t sure where the vacuum line goes but I reckon I’ll sort it out tomorrow. I’ve ordered the correct carburetor and new fuel/oil/vacuum lines.
Fun little project.

[drphilwv]

Feb 12, 2019 16:27:50 GMT -5 oldgeek said:

You should be able to get a original style carb at a reasonable price. Oil pump is probably fine, but you will need a new throttle cable that has a splitter for the variable oil pump.

Post a picture of the parts you have, a stock airbox would also be a good idea. You might want to try to do a compression test to see how that looks because you may find it needs a cylinder kit too. You have the shrouds for it?

Shrouds meaning all the plastic fairings and rubber covers? Yes. And I have a stock air box. The cable to the oil pump is still in place and works. The tip of the throttle cable is still correct for the original needle valve. It was rigged in to this carb. It’s dark out now but I can post some pics tomorrow. From what I can tell it’s pretty complete.

[ryan_ott]

Feb 12, 2019 19:54:26 GMT -5 drphilwv said:

Feb 12, 2019 19:33:57 GMT -5 ryan_ott said:

Oil pump can be checked by spinning it over with a supply line installed and primed (small screw on side) flow is very minimal only a bubble of oil every few seconds. The smaller line on the fuel tank should go to a vacuum source. Open up the cvt and check it over and also gear oil, especially since you have it upside down. It tends to leak out the vents. Exhaust gasket can be reused but if your getting a gasket set it usually comes with it.

Spinning it with the cable pull or do I need to remove the flywheel and get to the rotating end of the pump?.

Wasn’t sure where the vacuum line goes but I reckon I’ll sort it out tomorrow. I’ve ordered the correct carburetor and new fuel/oil/vacuum lines.
Fun little project.

There are a few ways to check the pump, the cam or valve just meters flow. Open it for more flow. You could pull the pump off and spin it by hand or with a drill. Or just run some premix in the fuel tank and pull the outlet line off with the engine running. Very likely it’ll work just fine, they don’t fail that often. They are more prone to leaks then a complete failure. Show us a pic of the carb when you get it and we will point you in the right direction.