FREE SHIPPING NEE0124K- Onan 'B', BM Series Master Tune Up/Decarbon/Valve Adj WITH Oil Filter.  The Onan B43, B48, B43M, B48M, engine is commonly found in Case Ingersoll Models 226, 446, 448, 648 and some 646 (Note: some extremely late model years of these tractors do NOT have points and those models would use an Onan P series Performer kit) 
These engines were used in many different brands of equipment as well like John Deere, Wheel Horse, Cub Cadet, Toro, Miller, etc. 
IF YOU HAVE A  ONAN B "BG" SERIES ENGINE LIKE A B43G OR B48G SO WE HAVE A DIFFERENT LISTING     CLICK HERE FOR  B43G OR B48G
CHOOSE- AIR CLEANER SIZE 8 inch OR 6 inch wide outside. 
CHOOSE- Carburetor You Have DD13, Nikki Early, Nikki Late LOOK at Photos. 
 
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,high-capacity fuel filter, 2 top-quality NGK spark plugs, a high-capacity OEM Onan/Cummins/Fleetguard oil filter, high-quality air filter,  high-quality USA made to our specs, 2 intake gaskets, 3 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. 1 aftermarket condenser.  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. 
(WE do have a small supply of REPCO points for sale listed separately, note they are no cheap and very, very hard to find but we are offer a limited amount to those who want them)
  
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 Filter.  OR if your tractor is a late model 226/4446/448 If you have a Nikki Style carb choose "early" or "late" for gasket (look at photos) Nikki use the large 8" air filter choose at check out. Look at photos.
SELECT BEFORE ADDING TO CART Carb Style & 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. 
 
NOTE 5/2023 OEM CONDENSERS ARE NOT AVAILABLE,  in our  kits are quality AFTERMARKET condensers. These are the best aftermarket ones we have used and found.  Also Acell spark plug wires have been replaced we have found a great replacement. 
 
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 oil 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.
 
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 on Case Ingersoll 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.
 
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

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 for B M Series. BUT WE HIGHLY RECOMMEND timing the engine and setting the points with either a test light or using the timing gun method and your manual for your model.  CLICK here to get to our video on this.