Frustrated with your carb never working right and no amount of service, cleaning, and repair seems to get things going? Finding a suitable replacement carburetor can be quite the challenge. The PB100 engine was used in a Yale Forklift for a short time and a near identical aftermarket replacement has been found for the factory Nikki 210028 carb but is NOT CHEAP. You will need to swap some linkage hardware, however, this appears to be an identical carb to to the factory Nikki used on the S650G and S550G. You can Click Here to buy it on Amazon or you can search online for part number 901278894.

We have not tested the above carb but it does appear at the core to be identical to the OEM Nikki used on Satoh Tractors.

Some have found a variety of suitable replacement options that they were able to get work with some fabrication. A handful of working options can be found looking at past posts on our Facebook Page.

If you are at your wits end with your original carburetor and cannot afford to buy a new replacement option, here is an option a Satoh owner has shared, having success using a Solex H30/31 PICT carburetor which was used on 1200 to 1600cc air cooled Volkswagon engines. The larger VW engines often used a 34 PICT carburetor. Genuine Solex can be found used on ebay but brand new generic replacement H30/31 PICT carburetors can be found new from a variety of places online. Click Here to buy 30/31 PICT-3 at Amazon.

A Video showing the custom lower manifold fabrication and the carb working on an S650G can be viewed here:

UPDATE!!!!

There is a new option we found after reading a comment on our Facebook page. Aparently another Satoh owner has already done this and their simple mention of it turned us on to a potential bolt on carburetor with minimal modification to work. An aftermarket carb for a Renault 12 and a Fiat 850 called a 30 ICFA. It looks like this (image linked to amazon)

Although not easy to find. There are a handful of options on Amazon and they can be found on AliExpress (called a SherryBerg carb). Ebay used to have them but they seemed to have dried up there.

Ultimately the carb was designed to for a different engine so when installed the choke and fuel line face the wrong way but the throttle and fuel bowl and vacuum line are essentially in the same place so it still works. To get this carb to mount you have to drill new holes in the base to match the bolts for the Satoh S650G intake manifold using the gasket as a template makes easy work of this. The U shaped linkage piece needs to be removed and replaced with the stock Satoh Carb connecting arm so it can connect to the Governor linkage. This is a simple process as it is just a nut and washer (careful not to loose either) A longer aftermarket choke cable may be needed to reach the choke connection. A longer fuel hose and some creative routing to the new fuel input location on the carb makes connecting the fuel easy. Finally you need the ability to hook the stock air cleaner to the larger diameter carb intake. A simple 2″ I.D. rubber or silicone coupler can work for that.  Surprisingly once the new holes are drilled and the oem linkage arm installed this carb simply bolts up and works.

To drill the holes you just need to take the bottom gasket off and match it up to the base of the new carburetor. Mark where the new holes need to go and then drill them out careful not to interfere with any of the internals of the carburetor. Using a punch to mark the center then drilling a pilot hole ensures you get things lined up. Also a drill press ensures perfect straight holes, however, if you are careful you can drill the holes by hand (we did in our test).  On our test the end of the carb base needed to be cut off so it fit with the stock throttle cable mount (image linked to amazon).

As you can see there is plenty of room to drill new holes in between the current holes and the carb internals.

Our carburetor choke cable will need to be replaced with a longer one so it can reach the new carb which is why the choke is not hooked up in the picture below. The choke attachment and function is the same as OEM, it’s just a longer reach. If you look closely you can see where the edge of the base is notched so it fits near the throttle cable to the governor.

The base vacuum line can gently be bent to connect to the new carb no problem. These pictures are from our test so the OEM intake tube was temporarily taped as shown in this picture. We have ordered a 2″ ID Turbo tube coupler to see if that can seal up the connection between the intake tube and the carb mouth.

The fuel line length will need to be increased so you can re route it around moving parts and get it to the new fuel hookup location and angle without binding the hose for free flow.

The stock Satoh connecting arm just needs to be installed in place of the one that comes with the carb. Position it so it lines up with the governor arm and then snug the nut down to hold it firmly in place. The arm may need some adjustment to ensure a low enough idle and high enough revs for using the PTO. The arm seems to hold its position no problem once the fastening nut is tightened enough allowing the carb to work just like the OEM carb. Also below you can again see the notch in the carb base we had to cut out to allow fitment.

We are happy to report that our test of this 30 ICFA Carb for a Renault 12 and a Fiat 850 was an easy to perform success, making it one more option for a replacement carb for your Satoh S650G. Some simple holes drilled, a linkage swap, and a longer fuel line was enough for us to fire off this Satoh without issues and once the intake boot was sealed we were able to operate and drive our S650G without any adjustment or further modification.

We will update this thread with new pics once we have the choke cable installed and the intake boot sealed properly.