350x - 300ex motor

**350Kris** · 10-18-2002, 10:49 AM

Just in case, parts become too scarce someday to maintain my 350x motors (ie heads go bad or something like that)....I have heard that a 300ex motor fits into the 350x frame with little effort. Is this the case....would it be a good mod? I would never do it unless I had too...just trying to keep my options open.

**Kilborg** · 10-18-2002, 04:41 PM

The 300ex mill can be made to work. You will lose a good deal of power, but make up for it with the lowend of the 300 motor (if you ride woods). It would still be a fun machine.

**OldSchoolin86** · 10-18-2002, 05:15 PM

It's a great mod if you do it right. The mounting is easy, you would gain electric start and reverse, and a good 330 kit would give you more power than a stock 350X.

Edit: A 250X motor work the same way too without electric start anyway. A 300EX crank and a 288 kit makes a 250X a 330 also.

10-18-2002, 06:19 PM

Originally Posted by 350Kris

Just in case, parts become too scarce someday to maintain my 350x motors (ie heads go bad or something like that).

yikes....the thought of that makes me a bit sad....but itll never hapen...i hope :oops:

**350Xrider** · 10-18-2002, 07:21 PM

This is just my personal; opinion, but I do not think that a 330 would run any where near a 350X, and if it did it would take away from the reliability a good amount.

**OldSchoolin86** · 10-18-2002, 09:29 PM

You die hard 350X guys kill me, that's cool though. Seriously I don't want to piss anyone off but it's just like the 350X 400EX debate. I drag raced a couple of them at Haspin thinking my quad would loose but I never lost to one, but that's impossible according to the 350X legend.

A good 330 kit would have no problem beating a stock 350X or have problems with reliability. By 330 kit I mean the big bore, mild cam, full aftermarket exhaust, cleaning up the exhuast ports, adding a K&N and proper jetting. Nothing radical or unreliable and I'm not talking about this in a quad, I'm talking about this motor in a trike.

**350Xrider** · 10-19-2002, 12:21 AM

Well, I dunno, I have beaten countless stock, and piped and jetted 400ex's with my 350X, and have never been beat. I have beat so many 300ex's with my X and they have not even came close. I also don't see how a 330ex motor could be faster than a 350X motor, I mean think about it it has one less gear,20 less cc's who knows how many less horsepower I think a 300ex has like 18 horsepower, and a 350X has 28 horsepower.I could probably name more things, but you get the drift.

**OldSchoolin86** · 10-19-2002, 07:49 AM

A stock 350X has 26HP and if you couldn't beat a 300ex that would be sad. Oh well, 350kris if your still reading this the point is you could have a great machine with this motor if things got that bad that you had to do the swap. Lets just hope that we don't see it get that bad soon.

**350Kris** · 10-19-2002, 08:28 AM

I don't think it will ever get that bad -- this turned into a good discussion! Thanks for the replies.

**Kilborg** · 10-19-2002, 08:58 PM

A well built 330 motor will have no problems at all beating a stock 350. Especially if its in a trike frame. It would take some money, but its pretty doable. The stock 300 motors make great lowend, and if you built it proper it would still have that characteristic. The electric start and reverse is a plus too. Other good things? Less fuel consumption, quieter, etc etc.

If you have the recources and spare parts to do this, by all means. If you have to start spending loads of cash to do it, I would stick with the 350 mill.

**Billy Golightly** · 10-20-2002, 09:33 AM

I've always wanted to put a 300ex motor into a 200x chassis. Would be a very good machine for woods. Electric start, reverse, all into a very small nimble trike.

**MR ATC** · 10-20-2002, 11:09 AM

if i may Oldschool without starting a big debate the reson's you beat my 350X at haspin was severall reasons first my gearing was not stock i was geared for top end not acceleration second after returning home i discovered the clutch was slipping due to it sitting for 17 yrs also if i remember you changed your gearing for acceleration so in all fairness it was not a = comparison. now as far as a 330 vs a 350X when i worked at honda a guy i knew came in with a 300 he told the owner he wanted his 300 to be able to smoke my 350 i lauged anyway i was building a 350 at the time so the other machanic and i made i bet he built the 300 with a unlimited budget (the owner had $$$) and i built the 350 mostly stock with the exception of 10.25:1 piston. the 300 ended up being a 330 with with all the goodies. after they were done we raced them. results 330 not even close

OH AND FOR THE RECORD the following parts for 350X motors are discontinued : head,valve cover,cam sprocket on the crankshaft,

**OldSchoolin86** · 10-20-2002, 11:51 AM

Sorry but your 350X wasn't that fast. I topped it out on that strip before the end and was still getting beat by a stock 400EX. I also raced another 350X with my 400ex that didn't get close. Another thing, your a way better holeshoter than I am and you still couldn't beat me with your 350X. If you did gear it for more acceleration you would have been tapped half way down that track. I might buy the bad clutch but it sounds like excuses to me.

As far as the 330ex debate I've seen 330ex's take stock 400ex's. I have no doubt that the same motor in a 350X frame would kill a stock 350X. The 350X is a great machine but it's not unbeatable.

Face it buddy, you lost on track and the only way to fix that is try to beat me the next time. I'll be at the Badlands soon if you want another shot at the title! lol

**MR ATC** · 10-20-2002, 05:17 PM

hey O.S. your absolutly right the 350X i had at Haspin was not that fast. first it was not geared for acceleration like you said you must have misunderstood me. it was geared for top speed second there is no way with the gearing i had would you be able to get flat out in 6th on that strip. third if you read my post on my 350X crate motor (the one in the 350X i brought to Haspin) you would have read that shortly after Haspin (when i rode in a place allowing me to get wide open)my stator went and i discovered my clutch was slipping at 7500-8000 rpm's in 5th and 6th gear therefore notallowing Max speed or power. now combined that with the differant gearing and the low reving motor would not pull the gearing.
as far as badlands NOV. 2 don't think i'll make it we are selling our house and moving so my travel plans are at a hold. but i will see you at Haspin next year for a rematch with a proper running 350X.

p.s. imagine how much farther i would have been in front of you in the woods with a 350X at 100%...LOL...JK

**Trikeaholic** · 10-20-2002, 05:32 PM

If I can interject here, i also raced OS 400ex at haspin, and he DID beat my 350X too. but he did not KILL it. Not too mention my motor is 17 years old and never worked on. I think a properly running slightly modded 350x would have to easily run with any 4 stroke quad of the same basic size, enginewise.

Thread: 350x - 300ex motor

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350x - 300ex motor

yeah

Re: 350x - 300ex motor

yep

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whoa