[callwill]

I have a case 448 with a performer 20 xsl transplanted into it. Ive used it for winter duty only but recently had to press it into mowing duty while i work on my craftsman. Last time i shut it off it ran on for a bit (it has never done that before). Today i could not get it to stay running, the plugs were wet/fouled and when i shut it off i could hear gas gurgling into the carb. After trying a few things and cleaning/drying off the plugs a couple of times with no luck, i went into the carb. I took the top off the Nikki carb (its a 6100? What are the other numbers for?) The Float and needle stayed in the carb body, took them out. Float seems good, but using a magifier i could see a ridge worn into the needle tip. I did not see any type of helper spring- should there be one?
Fast Source for a new needle?
Looked at pgs 7-2/73 of this manual for float adjustment..

http://manuals.casecoltingersoll.com/ServiceManuals/Onan%20Service%20Manual%20965-0762_watermarked.pdf

I dont see a reason to remove the carb body if i can help it.
Can i do float adjustment with out removing the carb body?
Lastly, what is the best sparkplug choice and gap?

So after posting i started "shopping" for a bit. I see there are brass floats as well as whatever mine are made of...Is the brass preferable?

 

[myerslawnandgarden]

callwill,

There is not a brass float available for the Nikki carb thus no spring is required either. Normally any repairs can be done without removing the carb body unless it needs to be soaked or ultra-sonically cleaned.

I do not have the needle available separately, but this kit should do the job at a reasonable price.

C29962 Carburetor Repair Kit Nikki (casegardentractorparts.com)

Bob

 

[callwill]

callwill,

There is not a brass float available for the Nikki carb thus no spring is required either. Normally any repairs can be done without removing the carb body unless it needs to be soaked or ultra-sonically cleaned.

I do not have the needle available separately, but this kit should do the job at a reasonable price.

C29962 Carburetor Repair Kit Nikki (casegardentractorparts.com)

Bob

Is the carb a 6100-146 0r is it a 146-6100?

 

[Bob MacGregor]

The carb is a 146-6100 Onan part number.

 

[Bob MacGregor]

Nikki carburetors overview and information

Hi Troops, Nikki carbs in various venturi diameters are found on later production B43M, B48M and all 16, 18 and 20 HP Performer series Onan engines. Later production P series Onan engines have a Nikki carb which has the addition of an accelerator pump. All Briggs & Stratton Vanguard twin...

www.casecoltingersoll.com

 

[callwill]

Nikki carburetors overview and information

Hi Troops, Nikki carbs in various venturi diameters are found on later production B43M, B48M and all 16, 18 and 20 HP Performer series Onan engines. Later production P series Onan engines have a Nikki carb which has the addition of an accelerator pump. All Briggs & Stratton Vanguard twin...

www.casecoltingersoll.com

Read through the overview post. Good stuff to know. In fiddling around while i wait to get parts and repair i am having a hard time figuring out how to make sure my float is set correctly with the carb on the tractor. This starts with laying it in correctly...i was not paying close attention when i took it out, is there a specific directin for that "D-ring" float hinge(left to right/right to left)? Ive tried it both ways and it wants to sit in there a bit cockeyed no matter which direction i chose. Also i noted that if i try to put the float and needle in without any fuel in the bowl, the float "angles" to a point where the needle slides out of its hanger tang. Im thinking to reuse my float and see if i can get a needle locally as i desperately need to mow, but cant figure out how to set this up from the directions ive read six times...

 

[Bob MacGregor]

https://www.casecoltingersoll.com/d3/manuals/ServiceManuals/Onan%20Service%20Manual%20965-0762_watermarked.pdf

 

[callwill]

https://www.casecoltingersoll.com/d3/manuals/ServiceManuals/Onan%20Service%20Manual%20965-0762_watermarked.pdf

Yes, i was referencing that manual..It is as clear as mud from the rudimentary drawings and the advice to turn the carb on its side...from the pics it looks like the retaining pin goes in left to right. Im hoping somebody chimes in with hints about doing it with the carb on the tractor.

 

[callwill]

Still looking for what spark plug recommendations...

 

[myerslawnandgarden]

Still looking for what spark plug recommendations...

Champion RS17YX for the Onan Performers.

In stock: RS17YX Spark Plug Onan Performer (casegardentractorparts.com)

Bob