350x motor vs 330ex

[30ex-man]

is it better to put a 350ex big bore kit or put the 350x motor in it

[m250r]

i would say the 350ex big bore but im not really sure...lets leave it up to some of the big dogs to answer this one

[ghak99]

It would be much easier to stay with the 300ex motor and build it the way you want it. Don't get me wrong, the 350x motor is a good machine, but it is a lot of extra work and is very costly to swap.

[notfastenuf4me]

def not costly swap well not for me considerin i got 2 350x trike motors for a 100 bux all i need is a counter shaft and new cam valves springs and guides dont need the cam and stuff but im doin the hole motor top to bottom

[85atc350x]

I would go with the 350x engine. I own 3 of these trikes and love them. The only downfall to doing this swap over is, You will loose your electric start. It shouldn't be too difficult to fit the 350x engine into your 300ex.

[srfootball50]

i think they both have good points and bad points the 350x engine swap is a faster motor has 6 gears but but no reverse and its kick start which can be bad unless you like kicking your motor over then you have to take out the old 300ex motor and hook up all the wires again and sometimes it can be costly to get a 350x motor now for the 330ex big bore i rode a 300ex with that big bore and was very pleased with the power it had and when my friend did the big bore he just left the motor in the frame and took off the head and its nice to have that electric start sometimes same with reverse anthor thing is if you have the money for the 350x know how to do some engine swaping dont mind the kick start or not having reverse then you would be very happy with it then later down the road there are big bores for the 350x you could alway get if you want even more power and speed but in conclusion you would probably be very happy with either of them and if you want more speed and you got the money the 350x is the way to go or at least thats my 2 cents on this and hope i helped you out some:D

[m250r]

i never thought i would see a paragraph that big without 1 period...haha

[panteramatt]

If you dont care about reverse or electric start, definitely go with the 350x. Its faster, will be cheaper, and youll have more top end.The swap isnt hard and it wont cost any more and might be cheaper. I has a 350x motor bred and stroked to a 450 and that thing had some power but man was it hard to kick over!

[wilkin250r]

Can you get to 350cc without stroking? I thought a 330 was just about the max bore you could find.

The cost will probably be about the same. You'll spend several hundred for a running 350X motor, and several hundred for pipe and install kit.

Stroker cranks are not cheap, and you'll probably need to split the lower end and machine the cases. All together, you're probably about the same as the 350X motor and install.

If you're big-bore/stroker 350EX is set up properly, it should be faster than a 350X, plus you still retain electric start and reverse. However, you lose reliability, and you really can't go any further with your engine, it's pretty much maxxed out.

The stock 350X motor will probably be slower than the 350EX, but being mostly stock, it will be much more reliable. You lose electric start and reverse, but if you ever DO want even more power, the 350X has potential for upgrades. The 350EX would probably be a little faster than a stock 400EX, but the 350x with upgrades can be made MUCH faster than a stock 400EX.

[srfootball50]

the most you can bore out a 300ex is a 390 big bore i think after that then you need to stroke it

[dork]

yea, 390 is the max most go, thats an 87mm piston on stock stroke. i've run mine over a year with no reliability issues, and its quite a bit faster than the 400ex, not just a little.

[K_Fulk]

Originally posted by srfootball50
the most you can bore out a 300ex is a 390 big bore i think after that then you need to stroke it

How bigcan you go before you have to bore the cases.

[Aceman]

330, I believe. The sleeve with my kit just barely fit in my cases and it's a thin one. I think some 330 kits they bore the cases just so they can use a thicker sleeve.

[notfastenuf4me]

you can make ur own header and spacers for the motor its not hard 440exguy is helpin me wit mine

[ghak99]

Originally posted by notfastenuf4me
def not costly swap well not for me considerin i got 2 350x trike motors for a 100 bux all i need is a counter shaft and new cam valves springs and guides dont need the cam and stuff but im doin the hole motor top to bottom

Your situation is not a fair comparison since not every one is going to fall into a deal like yours. I have seen many of the bare 350x motors, no pipe, carb, or electronics, sell for over 450 dollars. :eek2: I looked into doing the swap on my 250x a year or so ago because of the 6th gear and bigger cc combinations, but decided against it. I guess it all depends on how good of a deal you can find on the motor, electronics, carb, pipe, and what your time is worth.

[notfastenuf4me]

trust me i knwo its not a fair comparson all u need though is a 350x cdi box and powroll tells u how to use ur stock wiring harness and as it goes for carb and exhaust the carb u can keep ur 250 or 300 carb powroll says the 250x carb is the beat for the application and u have to modify a stock heard u have to add about 3 inchs after the flange where it bolts to ur motor and the came amount at the back im jus tryin to put my 2 cents in anyway u go u should b happy wit either motor

[ltl666devil]

If you search around you can find a 350x motor for cheap. I just purchased a whole 350x bike wit nothing wrong wit it other than the cam chain tensioner is missing and i only paid $300 for the complete bike. I used to have a bored and stroked 300ex and all it did was give me so many problems. Now i have a 250x with the 350x conversion and the 350x motor has a cam, ported nd polished,and a valve job. Its so much faster than the 300ex.

[beak7707]

I would look around and if you can find a cheap 350x motor go for it. I always wanted to do the swap just to be different. But if you dont find one I would go with the 300ex motor big bored. THe motoe is made to be in that frame, you will keep your electric start, reverse, and it wont be much if any slower than the 350x motor. I have always heard a good 330ex will run with a 400ex, well that about where a 350x would run too.

[sjc115]

I have a 350x motor in my 250x and it was well worth the time spent.

I got the motor for $550 from ebay, but it was a brand new, never been run motor. Actual used motors go for anywhere from $200 to $600 depending on the day. Then I sold my 250x motor on ebay for $600, making the motor swap cost a negative $100. The only modification needed to make the motor fit is grinding down one of the mounts. If you buy the powroll install kit it comes with instructions on what to do and the spacers needed to make it happen. Very simple install.

The exhaust and spacer kit from powroll was around $500, but you can buy just the install kit for about $70 and use a different exhaust if you want.

As for performance, it is right there with the stock 400ex's, if not a little bit faster. And since it is a stock motor, it will only get better with some mods like a cam and or bore kit (i think you can go as big as 450 without a stroker crank).

Other parts you will need are a 350x CDI box (got mine for $20), the stock 250x or 300ex carb, and 250x or 350x wiring (i don't belive the 300ex stock wiring will work without major changes).

I have never ridden a 330ex, but I would guess it makes more power than a stock 350x. The downside is the motor will be no where near as reliable and can not be made any better without serious modifications.

[fastleo]

:confused: heres the deal. i have a 300ex frame with a 35ox motor bored out to a 380 it runns. the stock swing arm is to short i tried to use the 350x stock arm and it had to be moded to make it work but im still having probs the front is 400ex a arms ist really a frankenstein but it still needs work all help or ideas very welcome,reply thanks andy

[2muchquad]

I have had the 350x motor in my quad before but i like the electric start and reverse of the 300ex motor.Mine has the 86mm piston,stock stroke and the cases were bored.It has been reliable for me and i dont babby it.It was built to run.There are pros and cons to both swaps,it just comes down to what your priorities are.For the 350x,grind down the top rear mount about a inch and get a 400ex exhaust header and extend the exhaust flanges about 2inches,theres your pipe,no need to pay $350 for the deal from powroll.;)