OKay I have a brother that has upgraded his 400EX to a 440 along with hot cams etc. I have another brother that has a CHERRY 85' 350X. My question is, can you make the stock 400ex piston work in a 350X motor? and the cam also??

Is it possible?

Thanks
Biggerisbetter.

 

Neither will work.

The wristpin on the 350X is larger and the piston has a different deck height from the 350X.

The cam wont work simply because both engines are so different. The 400EX is a RFVC type.

Powroll offers lots of parts for the 350X to make it scream.

If it's any consolation to you....the 350X can be built to make more power than a 400EX can be built for. It all depends on the size of your pocket book.

 

Thanks Knowsalot! (thats all I needed)

I knew if you saw this thread you would reply, and with the good info.[img]i/expressions/face-icon-small-smile.gif[/img]

Thanks agian.



Biggerisbetter.

 

The head and jug from the FT 500 Ascot can be mated to the 350x bottom end. I am not sure how big or how much power it had but I saw one years ago @ Silver Lake, Mi and it was unbeatable.

 

Trx440,

Thanks for the reply, FT ascott 500??? was that a honda motor? and was it a single cylinder? I thought the old Ascotts were twins.

DO you have any more info on this One-off machine??? sounds cool!



Biggerisbetter.

 

Knowsalot, will the RFVC head or head/clyinder from an XR350 work on the 350x bottom end? What about the 250x/XR250? What have you heard about the ascott combo? I too thought it was a twin.

 

There was a FT 500 single the first year, then a V-twin the following year. They were both called Ascot. -RT

 

I do know that and 87 XR 500 cylinder on up will bolt to a 350x and een line up in the mounts perfect, but it dosen't have the oil lines so you hca to block them off from the case...

 

Hey mad200xer, I don't find any information on a 1987 XR 500. I don't think they made it then. All I find is a 400 and 600.

Anyone know which it is for sure? I would like to try this top end as a project.

 

XR/XL/FT 500 series topends DO NOT fit onto 350X bottom ends. I have pictures to prove it. Even if they did, the topen is about a inch and a half or so taller, which would make it nearly impossible to fit into a 350X frame without hacking on it.