B-80 to B-100

[Hornet 8]

Hi, just joined. looking forward to posting questions about putting a K241 on a B-80.

[ebinmaine 67,655]

 

 

 

 

What's the need or desire to switch engines?

 

 

[clueless 3,005]

what year is the B-80? 4sp or 8sp?

 

[Sparky-(Admin) 21,339]

 

  Should be a pretty straightforward swap 

[Pullstart 62,916]

 

[Marv 924]

Easy, straight forward as mentioned. I currently have a k321 on my B80. I call it a B80/140. I am assuming that the bigger engine is fronm a Wheel horse of course. If not, you are going to need a replacement crank sleeve for the PTO as the one on the B80 engine has a smaller ID than the "new engine"

Marv

[Hornet 8]

ebinmaine

2 hours ago, ebinmaine said:

 

 

 

 

What's the need or desire to switch engines?

 

 

I hate to admit this but I must be honest and say it has more to do with physical appearance than anything. I just really like the look of that bigger engine. I know... I should just leave the good running little 8hp on there and leave it alone but I have a hard time leaving things alone. call it a sickness if you want. hahaha

[Hornet 8]

2 hours ago, clueless said:

what year is the B-80? 4sp or 8sp?

 

1975 and 4sp

[Hornet 8]

24 minutes ago, Marv said:

Easy, straight forward as mentioned. I currently have a k321 on my B80. I call it a B80/140. I am assuming that the bigger engine is fronm a Wheel horse of course. If not, you are going to need a replacement crank sleeve for the PTO as the one on the B80 engine has a smaller ID than the "new engine"

Marv

thanks Marv. I dont have an engine yet. I'm looking for any big K engine off of a wheel horse that I can make work with my PTO to run a mower.

[ebinmaine 67,655]

13 minutes ago, Hornet said:

ebinmaine

I hate to admit this but I must be honest and say it has more to do with physical appearance than anything. I just really like the look of that bigger engine. I know... I should just leave the good running little 8hp on there and leave it alone but I have a hard time leaving things alone. call it a sickness if you want. hahaha

I understand that from beginning to end.  

 

I'd be prone to looking for a 12 HP Kohler engine though.  

 

The difference between an 8 and 10 will be slight, if anything.  

The 12 will give you a good increase in torque.  

 

[Hornet 8]

54 minutes ago, ebinmaine said:

I understand that from beginning to end.  

 

I'd be prone to looking for a 12 HP Kohler engine though.  

 

The difference between an 8 and 10 will be slight, if anything.  

The 12 will give you a good increase in torque.  

 

I like your way of thinking. I think I will do That. unless I find a deal on a10 that I cant refuse. I like the idea of a 12

[oliver2-44 9,761]

1 hour ago, ebinmaine said:

IThe difference between an 8 and 10 will be slight, if anything.  

 A K341 16 will give you a good increase in torque.  

 

 

[Wheel-N-It 2,969]

4 hours ago, Hornet said:

thanks Marv. I dont have an engine yet. I'm looking for any big K engine off of a wheel horse that I can make work with my PTO to run a mower.

 

Yes, go with a K engine unless you want to rewire the tractor. The M engines use a magneto. 

I'm actually a big fan of the K's.  

[Racinbob 11,095]

 The 76 and 77 B's and C's have same frame and transmission. The 74 and 75 B's have a 2" shorter frame. That may give you some additional challenges but I can't be sure of that. I purchased a 76 B-80 brand new and it wasn't long before I had a K-341 on it. Assuming the shorter frame won't matter make sure you get an engine spec'd properly for a Wheel Horse. That's actually very easy. I purchased my K-341 from WW Grainger when the K's were being phased out. It was spec'd fine for my use. The threaded mounting holes under the oil pan for the right side bolts were there and the shaft was fine. Because the crankshaft is bigger it required the PTO bearing to be replaced. The K-181 uses a 6935 bearing while the 341 uses a 6658 bearing. The bracket that mounts on the engine is also different. A 104732 on the small block, a 104729 on the big block. Initially I was able to adapt small block bracket and it was fine for many years but I finally did get the correct bracket. Other than those items it was a very simple swap. A few minor things will come up but are easily solved. 

 A few other minor differences between the B's and C's for those two years were the rear tires, 23-8.5 on the C's, 22-7.5 on the B's. I swapped those. High back seat vs low back. Again, an easy swap. Headlights aren't standard on the B's but I bought a kit when I bought the tractor. The steering wheel on the B's are 13" vs 15" on the C's. I left that as it because I prefer it. 

 Because you have a 75 4-speed your axles will be 1" vs the 1.125" on the 76 & 77. Don't fret that. It's got plenty of strength. 

 You might notice the lack of a 'B-80 8 Speed' decal on the side. I removed them back when I did the swap. I now wish I wouldn't have. I always thought about ordering a couple 'B-160 8 Speed' decals but just haven't yet. 

Good luck, have fun and show us the results if you make the swap. 

 

[Retired Wrencher 5,465]

Hornet     I hope you find this site enjoyable and helpful.

[Pullstart 62,916]

10 hours ago, Hornet said:

ebinmaine

I hate to admit this but I must be honest and say it has more to do with physical appearance than anything. I just really like the look of that bigger engine. I know... I should just leave the good running little 8hp on there and leave it alone but I have a hard time leaving things alone. call it a sickness if you want. hahaha

 

9 hours ago, Hornet said:

thanks Marv. I dont have an engine yet. I'm looking for any big K engine off of a wheel horse that I can make work with my PTO to run a mower.

There’s a really amazing show in Arendtsville, PA in about a month that will have what you’re looking for!  It’s the Big Show!

[Hornet 8]

10 hours ago, Pullstart said:

 

There’s a really amazing show in Arendtsville, PA in about a month that will have what you’re looking for!  It’s the Big Show!

Thanks! and yes, I,m really trying to make it to that!

[Hornet 8]

11 hours ago, Retired Wrencher said:

Hornet     I hope you find this site enjoyable and helpful.

Thank you!

[Hornet 8]

12 hours ago, Racinbob said:

 The 76 and 77 B's and C's have same frame and transmission. The 74 and 75 B's have a 2" shorter frame. That may give you some additional challenges but I can't be sure of that. I purchased a 76 B-80 brand new and it wasn't long before I had a K-341 on it. Assuming the shorter frame won't matter make sure you get an engine spec'd properly for a Wheel Horse. That's actually very easy. I purchased my K-341 from WW Grainger when the K's were being phased out. It was spec'd fine for my use. The threaded mounting holes under the oil pan for the right side bolts were there and the shaft was fine. Because the crankshaft is bigger it required the PTO bearing to be replaced. The K-181 uses a 6935 bearing while the 341 uses a 6658 bearing. The bracket that mounts on the engine is also different. A 104732 on the small block, a 104729 on the big block. Initially I was able to adapt small block bracket and it was fine for many years but I finally did get the correct bracket. Other than those items it was a very simple swap. A few minor things will come up but are easily solved. 

 A few other minor differences between the B's and C's for those two years were the rear tires, 23-8.5 on the C's, 22-7.5 on the B's. I swapped those. High back seat vs low back. Again, an easy swap. Headlights aren't standard on the B's but I bought a kit when I bought the tractor. The steering wheel on the B's are 13" vs 15" on the C's. I left that as it because I prefer it. 

 Because you have a 75 4-speed your axles will be 1" vs the 1.125" on the 76 & 77. Don't fret that. It's got plenty of strength. 

 You might notice the lack of a 'B-80 8 Speed' decal on the side. I removed them back when I did the swap. I now wish I wouldn't have. I always thought about ordering a couple 'B-160 8 Speed' decals but just haven't yet. 

Good luck, have fun and show us the results if you make the swap. 

 

Beautiful Tractor! That's exactly what I want. Thanks for all the info!

[Hornet 8]

16 hours ago, Wheel-N-It said:

 

Yes, go with a K engine unless you want to rewire the tractor. The M engines use a magneto. 

I'm actually a big fan of the K's.  

Thank you!

[ebinmaine 67,655]

14 minutes ago, Hornet said:

Beautiful Tractor! That's exactly what I want. 

 

What year is your own B80? 

[Racinbob 11,095]

18 minutes ago, ebinmaine said:

 

What year is your own B80? 

He said it is a 75 4-speed which is why I qualified my reply. 

[ebinmaine 67,655]

33 minutes ago, Racinbob said:

He said it is a 75 4-speed which is why I qualified my reply. 

Ya know if I'd pay attention once in a while..... 

[richmondred01 2,237]

I told you this was a good group of guys……

[Hornet 8]

5 hours ago, richmondred01 said:

I told you this was a good group of guys……

Yes! Thank you for telling me about it!