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View Full Version : 300EX Frame, 400EX Motor?


Rusty91o
12-18-2006, 05:50 PM
Will a 400EX Motor fit into a 300EX Frame? I came across a situation where I can get a 400EX motor, I thought maybe I could put it in my 300EX Will I need to fabricate any brackets? Or will I need to change anything?
Rider-trx_250ex
12-18-2006, 07:25 PM
i've seen it done but don't know if it requires fabricating
red4ever
12-18-2006, 09:33 PM
even if u do have to fabricate mounts or whatever else i think itd be worth it. pull up at the sand drag and just drive off and leave the other 300s.....wicked
Rusty91o
12-19-2006, 01:21 PM
Yeah man that's what I'm saying. Just skip the entire engine build up process, and see if I can just get a bigger better engine. Maybe save myself alot of time and money. Just I don't have access to all the tools myself, like spare metal and welder and a torch. Have it down at the shop, but I doubt I'd be able to use it. That's If I'd even have to.
Alias99
12-27-2006, 07:46 PM
Why not just save and get the whole 400?
Rusty91o
12-28-2006, 09:49 AM
I wish I could. But I had to give a kidney just to get what I got now lol.
Alias99
12-28-2006, 05:24 PM
lol true atvs r expensive
Rusty91o
12-28-2006, 08:40 PM
Yeah definitely. But it's so worth it lol.
Sjorge450R
12-29-2006, 07:51 AM
the 400ex motor is different in shape. I know when I put my 300ex motor in the frame, its always a *****, I cant imagine a 400ex motor. the 300ex fits in the 400ex frame so I would say no, the 300ex frame cannot hold a 400ex motor. Mainly because of the head pipe on the 400. Its got a duel pipe so I know its going to be next to impossible to fit two pipes around the frame...
HondaEXrider22
12-29-2006, 09:11 AM
Originally posted by Alias99
lol true atvs r expensive

True that. But its better than a bag of weed or pack of ciggs lol.


BTW, if you can get pics. I am interested.
Rusty91o
12-29-2006, 12:40 PM
Originally posted by HondaEXrider22
True that. But its better than a bag of weed or pack of ciggs lol. That's what I'm saying lol.
ryanh250ex
12-30-2006, 01:55 PM
I know a guy who did this

it can and will fit

takes some fabrication
Rusty91o
12-30-2006, 02:25 PM
I had heard it was done but hadn't seen it also. But I probably wouldn't be able to do it if it requires alot of fabrication, due to the fact that I don't have all the tools and equipment. I would even imagine dropping the frame in the center a little bit, the cutting the pipes to go around the frame. There could be a bunch of possibilities.