I was woundering if you could take a 400 engine and swap it out with like a 500 or 600. My engine on my 400 locked up and needs replacing. I didnt know if this was possible.Let me know your ideas. Or if you know where i can find a new engine.

 

A 500 maybe, but not a twin.

 

Do you think I would have to change anything besides the engine and carb? Wiring, electronics etc...

 

LITTEL BIT OF THAT STUFF WOULD BE WORED ABOUT THE 500 FITTING

 

is the 400 2 or 4 stroke, if it is 2 stroke almost none of the engine electronics will work, sorry.

 

i have a polaris sportsman 500 engine in my atv it came with a 500 H.O and the prev owner had ploblems kpping teh front end down in trails with major hills and rocks and he has a sportsman 500 that was to sluggish for him so he swapped and i have a sportsman engine andcarb. its the 34 carb the scrambler has a 40 or something idk i think the engines are suppost to be the same on both atvs that are 500 but the H.O. put out alot more power. i hope everything works out for you it would be cool if you could fit a twin in that.

 

<div class="FTQUOTE"><begin quote>Originally posted by: sheepdogMSP8117

A 500 maybe, but not a twin.</end quote></div>

anything is possible if you know how to fabricate and have money. ive seen videos on teh web of people putting 4 cylinder snowmobile engines into scramblers and sports. and they fly!!!!!!!!!!!!!!

 

As far as I can tell, the four-stroke 425 that they call a 400 is built on a 500 block with a little bit smaller bore and stroke. I've seen them parked side by side and looked real close and didn't see any difference.

 

If its a 400 4 stroke the 500 4 stroke will bolt right in , they are based on the same motor the 500 has a longer stroke and bigger bore, if its a HO motor you will need the 40 mm carb and boots instead of the 34mm one.