Aerox oil pump, tuned engine need advise please........

Galaxy Tramp · L Plate Warrior Joined: 20 May 2009 Karma :

Hi

I have just completed the rebuild on my sons Aerox 50.

Previously he had a local garage "tune" the bike with 70cc Polini kit, bigger Dellorto carb, power pipe, rollers etc. During this process they removed the oil pump and tank saying that it would not provide sufficient lube for the engines state of tune. I believe the real reason may be one of getting it to work with the new carb. As a result my son has been adding oil to the fuel at fill up time.

After 2000km and him forgetting to do this a couple of times (or more) the piston let go, hence the rebuild using a 70cc Polini kit again.

I would like to refit the pump and tank, although we no longer have them, in order to remove the need to add oil to the fuel manually.

Does anyone agree that the pump will not do the job and can somebody tell me where the pump actually fits? Preferably with an image or two.

I presume the pump fits into the crankcase somewhere and there is a connector to pump the oil into the carb or manifold??

Appreciate your help with this.

Regards

GT

steo · Nova Slayer Joined: 08 Jun 2009 Karma :

Check that the carb has a connection that can actually take the feed from the 2 stroke pump, a lot of those replacement race carbs are designed to fit different scoots with big bore kits & will only run on a premix, hence that's why the pump & oil tank were probably done away with in the 1st place.
The alternative would be to replace with the standard carb & up-jet, your son may not be too please as he'll probably lose a bit of power. I think the Aerox is similar to the Neos so the oil pump should be located below the barrel on the right hand of the scoot just to the right of the flywheel.

Galaxy Tramp · L Plate Warrior Joined: 20 May 2009 Karma :

Thanks for the reply.

Not sure about spending more money on a standard carb, the garage kept all the removed parts and has since gone to the wall!! I cannot see any thing to connect the oil feed to, does it fit on the carb or manifold?

I would be interested to know what ratio of oil/fuel you guys would recommend using. There seems to be quite a bit of oil residue running down the outside of the carb, is it possible to overdo the oil addition?

I will take a look at your suggested location for the oil pump or though I have to say that I have not noticed a hole or plug in the position you mention that the oil pump should live. Will take a better look though.

Regards
GT

steo · Nova Slayer Joined: 08 Jun 2009 Karma :

The 2 stroke tube is attached to the carb & should have a feed nipple similar looking to that of where the petrol tube goes but slightly smaller. It will be obvious if there is one but I've seen those carbs on ebay & I'm almost positive they're a premix set up.
I don't know what oil your using (semi synthetic/ fully synthetic)? so I can't comment on the ratios to premix. It should be written on the container or measurements on the side advising of the mix.
The oil pump is covered by a plastic casing so you'll have to undo a few bolts to find it. They should be allen key type so be careful unscrewing them as they tend to get seized & easy to ring the heads. The only other advice I can offer you if you're keeping the current set-up is to have a five gallon drum of premix in the garage & get the youngfella to make sure the ped is always topped up.

Galaxy Tramp · L Plate Warrior Joined: 20 May 2009 Karma :

Does it really matter where the oil is added, could I not drill and add a feed nipple to the manifold?

GT

steo · Nova Slayer Joined: 08 Jun 2009 Karma :

I'm not a expert so I couldn't advise you on doing something like that, you would have to ring someone that tunes 2 strokes to answer that one. I'd imagine the reason manufacturers don't have the feed in the manifold is the oil & fuel are mixed more efficiently going through the carb, probably the way a 2 smoker inducts fuel/air/oil. also where the oil feed which goes into the carb is a type of jet which distributes the right amount of oil for the engine.

The manifold is only made of rubber so how would you get a good tight seal without the nipple coming loose or worse still, getting sucked into the engine!

Galaxy Tramp · L Plate Warrior Joined: 20 May 2009 Karma :

The base of the valve block is solid so I thought perhaps I could install it there just above the reeds.

Anyway it seems a bit of a non starter if the oil is fed through a jet rather than just a pipe.

Somebody else must have come up against this predicament before I am sure! Dont be shy let us know what your solution was.

We use Castrol 2T semi synthetic oil by the way.

GT

tshort2007 · Scooby Slapper Joined: 07 Jun 2009 Karma :

Not that i recommend it, but my AR125 oil pump as standard does not feed strait into the carb. It connects to a hole in the casing, between the carb and the valve. But please bear in mind the AR doesnt use a Reed valve like most 2 strokes, it uses a rotary valve, so i couldnt advise if a direct feed into the intake manifold AFTER the carb will distribute the oil evenly. If you did decide to try it, you would need to drill and tap a hole in the intake, and use a metal screw in nipple, similar to the ones on brake calipers, but ensure that its through flowing when tight! i'd advise using locktite or PTFE tape to airseal the connection, and a small jubilee clip to hold the hose on the nipple.