350x - 300ex motor

[350Kris]

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]

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]

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.

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]

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]

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]

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]

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]

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

[Kilborg]

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]

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]

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]

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]

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]

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.

[OldSchoolin86]

MR ATC:
LOL! Your all right buddy. Can't wait to see you at the next Haspin gathering. I'll have the quad there so you can redeam the good name of the 350X. I'll have to work on my holeshoting skills because you are damn good at it. For anyone that wasn't there I let MR ATC race the 400EX down the strip several times because he was beating things with my 400EX you don't normaly hear about including machines like the Banshee and the Raptor. It was pretty sweet.

Trikeaholic:
You have a very good point with the 17 year old motor but you know how it is, I have to enjoy the victory. I had a lot of fun out there. I couldn't remember who had the other one I'm glad you did. I'm sure that a fresh and slightly modded 350X would have no problem sneaking up front but between MR. ATC and myself we proved the the 400EX's aren't the big slow dogs they are rumored to be. Hope your planning on being there next year too.

Peace guys and be safe out there.

[Trikeaholic]

I too got to ride that golf cart,(OS 400EX) along with trikes suzuki. I liked the Honda better, and yes, it was fast, lots of low end, and fun to ride, but dont count on me buying a cart anytime soon! ;)

[karnivore660r]

:shock: I'm just wondering who the suck azz riders where that you beat them on banshee's and raptor's with your ex?

I raced my stock raptor against your piped and jetted (cam'd? & ??) 400ex and we where dead even the whole way.

BTW, a 330ex motor in a 350x frame would stay with or beat a stock 350x.

[OldSchoolin86]

You missed all the good racing. Those victories were won by MR ATC earlier in the day.

Back to the 330ex/350x debate. I wrote Mickey Dunlap to see what he would say. Now you guys got me wanting to make one of these machines. Here's what I wrote:


I have a 350X minus the motor and want to install a 300EX motor. I can do all that but I want to know if I got the motor if we could put together a 330kit that would be stroger(faster) than the stock 350X motor. I installed one of your 80mm piston/sleeve kits in my old 250X and like your products. What do you think we can do here?

Thanks
Frank

Here's what the king of power wrote himself:


Frank,

If you put the 330 kit in, cam & valve springs, port & flow work it will
outrun your 350X.

Mickey Dunlap

Are you going to tell me that Mickey Dunlap is wrong too?

[TimSr]

Getting back to the original post, a friend of mine has a 300EX motor in his 350X, and he said it was pretty easy. I didnt even notice until the first time he used reverse, then it hit me that he had electric start too, and I asked all, the questions.

[MR ATC]

I'm not gonna say anybody i haven't spoken to personaly on this subject that there wrong or right but, what i will repeat is the shop i worked at used a micky dunlop kit to build the 330ex i mentioned earlier that got beat by the 350x i built with nothing more then a 10.25:1 piston.
(yes the head was also ported ). tell me this how do you think he could get 10 more hp with just a big bore,cam springs,port and flow when he can't do it to a 350X without a stroker kit? not to mention the 300ex's rev limiter. did you ever think he was refuring to a 17yr old worn out 350X motor compared to a freshly rebuilt 330EX one when he made that statement?

[OldSchoolin86]

I've seen the heads on the 300ex/250x's, yes I can believe that you can get 10HP out of a big bore, cam, and porting job. That would put it 2HP over the stock 350X.

So your saying that this 350X with 10.25:1 piston had stock bore, exhaust, air cleaner and jetting? This is a comparision to a stock 350X motor you know.

[Billy Golightly]

The key here is that Bill's 350X head is ported. Porting is without a doubt the single most hp effective mod there is. I don't care if your piston is 10ft in diameter. If the fuel, and the exhaust is incoming/exiting through a hole the size of a dime, The engine is not getting the fuel/exhaust flow near what it needs. Anything over what the engine NEEDS is extra, meaning therefore more power. The stock exhaust on the 350X is one of the most restrictive things I've ever seen on any offroad machine in my life (Tied with a stock Tri-Z exhaust).

I'm not sure if the 300 head is "optimized" for the extra 30cc it put on plus its extra carbeuration/exhaust in the cam that comes with the 330 kit. But if its not, the engine is being restricted from what it NEEDS, and any EXTRA that it could have.

[OldSchoolin86]

The 330 kit would include a good porting job. The stock ports on the 300ex are restricted so bad I can't even get the tip of my pinky finger in them. I thought he ment the 330ex was ported but if he meant the 350X then that machine has no buisness in this debate.

[MR ATC]

First let me clarify something it was not my 350X it was a customers. now let me also clear some things up it had a 10.25:1 piston only. the exhaust,carb,and porting were stock. the carb was rejetted and a uni air filter were installed. the 330ex had a all around cam,valve springs,330 piston,bigger carb (not sure what size) uni air filter,and was ported to Micky's specs. after they were done we raced and the 350X won with no problem. (and rider skill is irelevent since he (the other machanic) was/is a better rider then me

[OldSchoolin86]

Thank for restating that the 350X your talking about has nothing to do with this. ;)

ok you lost me O.S. what do you mean it has nothing to do with it? your stating opinion and speculation i'm stating facts of a actuall real life comparison. do you really think a 10.25:piston makes that big a differance in this debate? especially since it had a stock pipe and carb. i think you've been riding these golf carts too long there messin up your head...lol

[OldSchoolin86]

lol, no I don't think it's a huge increase but this 330ex motor is probably only a couple hp more. Bumped compression, a nice air cleaner and a good jetting should put the 350X motor back up there. Heck a good air cleaner and jetting alone would get you a couple more hp on that motor.

[86waterpumper]

good points, I've studied on putting a 250x or 300ex motor in my 200x once it wears out again, for the reasons billy already stated, it would rock in the woods, my 200x motor is sufficient for now, but I have to run a 11 tooth for it to pull hard since I'm a pretty big guy, and I wouldn't mind more top end and reverse electric start etc. But I've talked with several people about the goki starters made for the 350x, and they all said that once you put a high compression piston in it, the starters will burn out. Now I don't know whether this 330 kit for the 300 motor has higher compression than stock, but if it did would this not burn up the stock starter just as easily as it would a goki starter? One reason I wonder is because my friend has a 98 300ex, and keeps his with a fresh battery and on a trickle charger, and when it gets really cold, (for down south anyway) his starter will barely turn his motor over, usually not enough to crank it. Did goki make a starter for the 200x? Curious since it had such higher compression than the 350x in stock form.

[350Xrider]

We'll Mickey Dunlap is going to tell you that a 330 will outrun the 350, he wants to make money he wants to sell you the kit, he isn't in the business to lose his ass. I'm sure he wants all the money he can get.

[350Xrider]

As far as I know Goki makes or made rather a starter for a ATC 185,ATC200,ATC 200s, and ATC 350X, aside from that I think they may have possibly made one for a 250r at one time, I'm not sure about the 200X though.