Onan 'B' Series Master Tune Up/Decarbon/Valve Adj With Oil Filter.  The Onan B43, B48, B43M, B43G, B48G, B48M engine is commonly found in Case Ingersoll Models 226, 446, 448, 648 and some 646 (Note: some extreamly late model years of these tractors do NOT have points and those models would use an Onan P series Performer kit) CHOOSE AIR CLEANER SIZE 8 inch OR 6 inch wide outside. CHOOSE Carburator You Have DD13, Nikki Early, Nikki Late LOOK at Photos
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It is recommended and extremely important that all Onan engines get decarboned at every 250-500 hours.  Depending on engine use, oil consumption, operating engine temperature, carburetor adjustments and spark plugs, if you did not  have good hot complete combustion, burning lots of oil, or rich running condition your carbon buildup can happen much faster. Not de-carboning or adjusting valves can lead to catastrophic engine failure, lower performance, and lower fuel economy.
 
Onan 'B' Series Master Tune Up/Decarbon/Valve Adjustment, Ignition and Filter Kit,
Included in this kit we give you 2 aftermarket condensers.  High-quality aftermarket set of points (we have tried many aftermarket points manufactures and options, and these by far we have seen the best results with and are far more economical than the expensive OEM option.  If in the budget, we recommend OEM points. Current OEM points are NO longer the superior quality "Repco" points but they are good quality, OEM points and the option is available at check out to upgrade to them.
 
  Also, included is a high-capacity fuel filter, two top-quality NGK spark plugs, a high-capacity OEM Onan/Cummins/Fleetguard oil filter, high-quality air filter that is all included in our seasonal tune-up kit.  In addition, you will receive the gaskets needed to do a decarbon and valve adjustment job.  Included will be high-quality USA made to our specs, 2 intake gaskets, 2 valve cover gaskets, Carb to intake gasket and air filter housing to carb gasket, points gasket, And two very high-quality aftermarket head gaskets or you will have the option to choose Onan OEM head gaskets at check out. 
 
A Carburetor gasket for the halves is include so you can clean your carb too. These years machines with "DD Style" carbs should have the DD13 from factory, but someone could have swapped a DD11 make Note if You have a DD11. DD carbs have 6 inch Air Filters.  OR if your tractor is a late model 226/4446/448 If you have a Nikki Style carb choose "early" or "late" Nikki and the large 8" air filter choose at check out. Look at photos.
 
SELECT AT HECK OUT Carb Style and Air Filter Size
 
OPTION- add the grommet for the oil filter. It is a needed piece to keep your engine properly cooled and avoid catastrophic engine damage. It is an oil filter to tin/heat shield grommet. If you do not have one or yours is damaged it is a MUST HAVE item on your Onan. 
 
PLEASE NOTE 5/2023 OEM CONDERSORS ARE NOT AVAILABLE, they are currently on national backorder with no ETA. We are replacing them in our  kits with TWO AFTERMARKET condensers. These are the best aftermarket ones we have used and found. We will offer OEM one as if and as soon as they become available. Also Acell spark plug wires ahve been out of stock for over a year, but we have found a great replacement of the same quality. 
 
Be sure to watch our videos on how to adjust values and decarbon Onan engines.
 
Video Links:
How to De-carbon & Replace Head Gaskets On A Onan or Many Small Engines. DO BEFORE ADJUSTING VALVES
 
How to Adjust the valves on a ONAN Small Engine

 
This kit includes what you need to do your routine seasonal maintenance, tune-ups, and major tune-up/decarbon/valve adjustments.  This is what we use in our shop.  The high-capacity oil filter helps with keeping cooler engine oil temperature, filtration, and oil contamination dilution, any time you can get more oil capacity in a small engine it is a great benefit. The spark plug heat range we select here for our kit we have found works best with today's gasoline.  The OEM-owned fleetguard filter brand is the number-one filter company in the world.  This kit is what you need to make your Onan "B" series run like new and stay that way.  (Kit will work on most brands of tractors that have 'B' series engines B43 B48)
 
NOTE: THERE IS AN OPTION ON AIR FILTERS TO BE DECIDED AT CHECKOUT.  Depending on the year of your machine there were different air filters used,  90 percent of Onan B Series will use the smaller dimension filter, and the smaller filter is used with ALL DD Carbs. (Measurements for this smaller filter are: 3 inches high; 4 5/8 inch ID; 6 inch OD)  The DD Carbs are square with a fuel pump bolted right onto the carburetor.  If you have a  Nikki carburetor and your tractor is a very late model 226, 446, 448 you will need the larger OD air filter. (Measurements for this larger air filter: 2 1/8 inches high; 6 5/8 inch ID; 8 inches OD) Most Onan-powered tractors with the plastic dashboard use the larger OD filter but to be 100% sure you are selecting the correct filter, measure the filter on your tractor before ordering.
 
SHOP TIP: We recommend always running high octane, premium gas in ALL small engines and Case Ingersoll machines, and even better if you can get ethanol free.  We have found a noticeable difference  in performance and reliability/issues
SPARK PLUG GAP .025 - .030
Valve Adjustment Clearances:  .005-.008 on intake;  .012-.014 on exhaust are the clearances we use
POINT GAP:   .021 BUT WE HIGHLY RECOMMEND timing the engine and setting the points with either a test light or using the timing gun method.  CLICK here to get to our video on this.