need thoughts on this project

[TRX_Thumper]

ok...i have a brand new 350x motor...and a couple month old 2002 300ex motor...im going to use the 350x motor and sell the 300...but i have noticed this...both left an right sidecases interchange with these models...and the top ends would 2...except that the 350 has a stroke of 68 and the 300's is 65.5...so i dont think puttin the 350 top end on the 300 would work but i dont no? anyways im a woods racer...i need more power and electric start...for the starts...so do u think its possible to take the left sidecase,stator an flywheel and starter and put on my 350x motor off my 300 motor? would this work? the sidecase will bolt up but after that i dont know...these motors are much alike just wonderin if any1 has ever done it before

[2fastandfurious]

Should work. Hey I threw a chain and cracked my stator case. I could take the 300x one for ya. How mucha re you gonna sell that motor for? I might be interested.
-Ben

[honda250xrider]

i have heard of people putting 350x heads on 300ex before in fact i think tc might do that not to sure though

[TRX_Thumper]

i think im going to try puttin the electric start on the 350 motor...or puttin the 350 top end on the 300 lower end...either way the 300 motor isnt goin to be complete....ok guys heres a serious question...the 300's rod was designed for the 300 cylinder...the 350x's is 68...unless the cylinders are the same heigth...how would this work...if the cylinder are the same heigth this would put the motor bein around 335-340 cc's i think...

[99'300EX]

i dont think it will work out but ask around...

[Live2Ride300]

The 300ex rod might not be long enough for the 350X top end. Im not really sure tho. I dont really know much about hte 350X motor. Where did you get yours btw? Ive seen a few on ebay, that were brand new , they were used in a tech school.

[TRX_Thumper]

yeah the 350x cylinder is around 1 1/2 half inches longer no way that would work without a rod...so what about puttin the e start on the 350 motor? would that work?? sorry not to sound like a dick but im not gona say where i got my motor...no its not stolen or to the sort...just somethin i gotta keep to myself lol

[Live2Ride300]

Lol, damn. You know a guy at Honda and he had one built for u? lol, you must have some kind of connection. Know nething about a new honda quad, lol ---just kidding. Maybe you could have a custom rod machined just for that purpose, maybe give powroll a call and talk to mickey or call TC racing. I have no idea about the electric start, but that might involve changing gears and stuff like that, maybe machining the case, i duno. Maybe it could be done.

[TRX_Thumper]

yeah if my memory serves me correct i think there is a gear machined into the main cases for the electric start...i really dont wanna split any cases to install a rod so i will just run the stock 350 motor for now..then later...maybe do some work to it...high comp piston an cam..i can tell u this...honda didnt stop makin the 250r cause they wanted 2...just like they didnt stop makin the 350x cause they wanted 2......just a thought

go here for some info and a phone number to call and ask a pro aboutt it.. Nice meetin ya this weekend dude,,see ya at the races.

http://www.atving.com/editor/racing/feature/techtip/chassis.htm

[TRX_Thumper]

thanks for the link rico....so what place did u end up finishing overall? have any wrecks or anything happen?go here (http://msws.org/) to find out what u finished if u dont already know

[JabberJaw]

need thoughts on this project

I try to think.....but nothing happens!

[SpeedBump]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=10368&item=1873904658&rd=1 hey, here is a alternative to hackin up your 300ex motor. You can buy a brand new goki starter for $289 . look in any dirtwheels mag. I have seen good running 300ex engines go for upwards of $600 or so. that is complete running engine. I have a 300EX/350X conversion that i just finished. I love it. I do miss my electric start, and this spring, i will get me a goki for my quad. I also have the 300 engine, and i have looked into switchin the sidecases, but it also has a hole in it for the reverse shifter shaft. it would need to be welded or plugged. also, there is no mounting bosses in the right side of the case to screw the starter motor to the engine. the one bolt that holds it in the left sidecase wouldn;t be nearly strong enuff. look at your 300ex motor, see where the starter lays, way bad if it bangs around, there goes the cases. The only smart way to get the electric start is go with a Goki. Oh ya, BTW, I think you also need to fab up some sort of battery and charging system too. that would be a pain in the arse, and require choppin up the stock wire harness too.( unless you already did, I used the stock 350x harness.) http://www.msnusers.com/SpeedBump/shoebox.msnw you can go here and see some pics of my quad and some other stuff too.

[Live2Ride300]

What kind of modifications need to be done to the frame to mount the 350X engine?

[TRX_Thumper]

no modifications to the frame needed...just cut an 1 1/2 inches off top back left motor mount on the motor....take maybe 5 minutes way easier than weldin on the frame....after that u will just need a few spacers...i didnt notch my frame for the oil line bolt..just grind it down a little....but if i want to take the top end apart i will just take the motor out of the frame which is no big deal....speedbump tell me about your exhaust system? did u buy a powroll or fab your own? im goin to start with a full stock 400ex system and go from there...also im goin to run a 400ex carb...what carb are u running?

[TRX_Thumper]

ok i saw your website..nice bike...can u tell me the measurements on extending the 400ex header...and is the FMF your using for a 300ex or 400ex?

[TRX_Thumper]

bump

[Live2Ride300]

Bump

TRX_Thumper - how did everything go?

[TRX_Thumper]

bolted up the motor hooked up the carb....took the header pipe to the muffler shop to get it extended..nope they couldnt weld stainless steel..it was a 400ex headpipe....took it to 3 other places...noone would do it so i said heck with it bolted the 300 motor back in and should have a new kawi 400 within the next month...ended up sellin the motor on ebay...i had 2 of em but ones lower end was junk....