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Ebay has piston , ring and gasket kits for about $30. The barrel is cast iron, so if there is no lip a simple hone may do. I f the barrel is pitted , you will need an oversize piston kit, and a machine shop to bore the barrel to a bigger size.
You need to rebuild the carburetor. As it is a 1 barrel its relatively easy to rebuild if you can find a kit, but it is the original carb and difficult to find parts. You may also consider buying a Holley 2 barrel carb - it will bolt right on and give you more power, and they are much more common and easier to find rebuild kits and parts. It's possible you may need an adapter plate, depending on the configuration of your intake manifold, but that will be easy to find. You can either shop online or buy from your local auto parts store or high performance shop. That old 1 barrel has had its day and I'm sure it served you well,but I think I would upgrade to a newer carb myself.You may be able to clean it out using carb cleaner spray but it would be hard to clear out that clogged jet that is causing your trouble, and then you will likely tear the gasket when you take the top off that carb.
Let's hope you didn't force it and snap the plastic point off.
Most Zefal pumps come with a reversible head that can adapt to either Presta or Schreader (like on cars). You unscrew the barrel at the working end of the valve, carefully tap out the rubber cylinder and the plastic internal piece behind it.
Insert the plastic piece in either of two ways. Pointy part Out (for Schrader) or just a round opening Out (for Presta). Rotate the rubber piece correspondingly to show the large opening for Schrader or the smaller opening for Presta and place it inside the valve over the plastic piece. Screw the knurled barrel on tightly.
hi yes the automotive kit is the same bar the main jet size a pump diaphram will be in the kit but if the pump is a piston type i dought there will be a piton they do wear a bit if it is worn out you could have a problem maybe a wreaker yard but put your jets in or you will lose top end and acceleration hope this helps merlin v12
The grease in the upper drive area used to be a purple looking grease and the grease in the barrel was a different color and weight. If you ordered the rebuild kit with the O rings and bolts I would use it in the barrel (light film coat on the parts )