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Discussion Starter #1 (Edited)
Does anyone have any links to a website or another thread that gives reliable detailed information about the compatibility of parts between a brute force 750 and the other v twins.

I need to rebuild my motor and can easily find prairie cases and brute force 650 cases alot less exspenive. I hear some people say they interchange and some posts say they don't or need milled.

Are cylinders interchangable. Can I buy a complete bottom end from a 650 and put the 750 jugs and heads on it? ( I understand the 650 has a shorter stroke and I would be destroking it. But if it would work and get me riding again I know where I can get a 650 bottom end)

Does the arctic cat 650 motor fit in a brute? It's made by kawi and looks the same. I just want my quad to run again.

Of course I would love to put the high perfomance parts in it and make it fast but the finances are not there and I think even the 650 stock performs pretty well.

My quad is a brute force 750 I didn't want confusion becuase I keep throwing out 650. I have just found that I can buy a used 650 motor alot cheaper so I was thinking about putting that in for now. Thanks Ryan
 

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if its a 650i bottom end then bolt it in and go, im not sure if the 750 jugs will bolt in though without enlarging the holes in the case, but they might because they are aluminum like the 750.. the 650 solid axle bottom end is a little different, you will definately have to bore the cases for the 750 jugs, and the rear output is different somehow but it can be changed without much trouble..
 

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The 650 in the Arctic Cat is a prarie motor. That's what I have in mine. I'm fixing to do a 840 bbk on mine and Glenn at AMR said I will have to bore the case for the 750 jugs to fit on it, they will not just bolt on. I bought some jugs from Brett750 on here. If you go with a 700 crank and rods in that 650 you will like it. That's what I'm doing with mine. About 6 more hp with it. Hope this helps
 

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Discussion Starter #5
So does the Prarie Motor fit in a Brute Frame?

So does the Prarie Motor fit in a Brute Frame? Kawi has a different part number for the engine cases so I assumed something is different.
 

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Yes it fits in the frame. The 4X4 shaft is different, and you would have to use the 650 cylinders unless you machine the 650 cases to accept the 750 cylinders.
 

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Discussion Starter #7
So I have to change the shaft and mill the cases?

So if I found used Prairie cases I could put all my bottom end parts in the case and mill the cases and it would accept my 750 jug and heads.

Thanks Ryan
 

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Discussion Starter #9
My cases are broke

I had a conecting rod come apart and the cap went through the case. I am thinking about welding it but prairie cases are pretty reasonable on ebay so I could just buy some used cases. I was hoping someone on ther had a set of brute cases they would sell cheap but no luck.
 

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Kfx 700 and prairie 700 are the same cases, with same crank and rods. You would have to use your brute tranny if you want low gear(if you use a kfx700 case).
 

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Discussion Starter #11
JakeDogg Thanks for the info. I assumed the kfx 700 cases are different I thought they were 2 wheel drive and I assumed no front output shaft. Is there just a cover over the front output hole. The KFX and Prairie cases have a different kawi part number. If they are the same cases why are the part numbers different. I am not questioning your knowledge I just don't want to spend money on something that won't work. Thanks Ryan
 

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Yeah, they are the same. Like I said though, you would have to use your 4x4 shaft in any prairie or kfx engine.
 
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