350x engine in a 300ex frame?

[m250r]

Would this work^^? I'm interested in doing it to increase the power in my 300. Would the engine fit in the frame? Could i use the same motor mounts? Let me know guys..HELP ME OUT HERE!:D

[Blown 331]

I know this is much help but yes it will fit, they sell kits to get them in there. Conversion exhaust and everything.

[Blown 331]

http://users.nlamerica.com/dixiebai/atv/html/250x2.html

example

[dirtmomma]

The 350x head will also fit on your 300 motor :blah: that'll give ya some UMP LOL I'm thinking of doing this w/ mine. One of our team members is goin to put a 350x in his 250x frame!!

[ryanh250ex]

it will definitely work, and it is supposed to be a nice boost in power.

i didn't look at your list of mods, but in case you havent done so already, you might want to do some suspension work. my friend knows a guy who did the same conversion a while back, and while he said it was REALLY fast, it was a bit too much motor and not quite enough handling. that's why i'm doing a 350X swap into a 250R frame.

[m250r]

yeah i was thinking about running a 400ex front up setup...any suggestions or feedback?

[bigfoot300ex]

the 400ex front conversion is awesome
i did the conversion from spindle to spindle
it feels like it jumps better than a stock 400 even though its the same suspension
a lot of people on here said the conversion is very bad
but i have raced on my front end for over a year with no problems

[m250r]

anyone else about the 400ex front end or the engine in the frame?

[wvspeedfreak]

I have 400ex control arms on my 250x.I am not using 400ex shocks though.I have a set of Works shocks up front that are designed to use your original upper shock mounts(to use the 400ex shocks you need to fabricate a higher upper shock mount).I couldnt be happier with mine,it is a HUGE improvement over stock.

[m250r]

wvspeadfreak-How did you get those shocks to fit with your original shock mount? Do you have any pics of the front end of your quad?

[Dupontster]

go to powroll.com, they sellnice kits with exhaust.

[wvspeedfreak]

I will try to post a pic.Works makes the shocks specifically for this conversion.

[m250r]

if u cant post it can u just e-mail it to me at m250r1234@hotmail.com

[Moded86R]

Originally posted by dirtmomma
The 350x head will also fit on your 300 motor :blah: that'll give ya some UMP LOL I'm thinking of doing this w/ mine. One of our team members is goin to put a 350x in his 250x frame!!


Are you sure the 350x head will fit on a 250x/300ex cylinder.Along time ago i was told it wouldn't work.Somethin about the 350x cam spins differently than the 300ex.So you would have to get a special cam made.Don't qoute me on that.I just read somewhere it wouldn't work.



Yes the 350x motor will fit a 300ex frame.You will have to grind the back motor mount on the motor itself.Powroll makes a bolt in kit.Along with an exhaust for the conversion.I rode a 92 250x with a built 350x motor in it.That thing hauled and it wasn;t running right.Now I am starting to build my own.

[dirtmomma]

Hmmm well maybe not but I swear a guy told us it would, he builds some fast quads, maybe he said he was going to try it, I'll have to find out if he ever did I guess & see if it worked:o