14t on 300ex how to/ 400ex

[ridered46]

I've searched and can't find what i want on the sprocket how much do i have to grind the case saver? can i use my stock chain? What else do i need to do to make it work. My second question is a 400ex carb i have a cobra pipe k&n higher rev cdi. What needs to be done to make it work i noticed that the little black hoses and nipples are located different on the carb vs. the 300ex carb. What kind of gian will i see? Also how about jetting my evualation is around 535 feet is there a chart and correction factor for jetting? thanks for the help.

[Ryanwolfe911]

There's no set amount to grind off your case saver, just grind until the chain no longer rubs. As far as the 400ex carb, why would you want that carb unless you had like a 390cc bore and stroke kit? the stock carb has plenty of room for adjustment for just about any performance mod you can do.

[Sjorge450R]

Originally posted by Ryanwolfe911
There's no set amount to grind off your case saver, just grind until the chain no longer rubs. As far as the 400ex carb, why would you want that carb unless you had like a 390cc bore and stroke kit? the stock carb has plenty of room for adjustment for just about any performance mod you can do.

thats not always true. You will still get performance from a bigger carb. Its just that when it is too big, it hurts performance. I would say start with stock 400ex jetting and go from there.

[Ryanwolfe911]

Even stock 400ex jetting is way too rich for a 300ex. It's 100cc's bigger, remember?

[ridered46]

Can i use my stock chian? If so will i have to add or remove links? will it wear quicker? thanks

[my250ex]

Originally posted by Ryanwolfe911
Even stock 400ex jetting is way too rich for a 300ex. It's 100cc's bigger, remember?

its actually 115cc's bigger

[300ex mxracer]

Originally posted by Ryanwolfe911
Even stock 400ex jetting is way too rich for a 300ex. It's 100cc's bigger, remember?

not true i run a 400 carb on my 300 and im running a 170 main, jetted perfect.

[300ex_#387]

Originally posted by ridered46
Can i use my stock chian? If so will i have to add or remove links? will it wear quicker? thanks

You will probably have to adjust the chain, but I think you can use the stock chain.

[Sjorge450R]

Originally posted by Ryanwolfe911
Even stock 400ex jetting is way too rich for a 300ex. It's 100cc's bigger, remember?

not to start any thing, but do you happen to know any thing about larger carbs??? They have a different size slide which in return will make the jet sizes bigger.

[Ryanwolfe911]

No **** sherlock, that's what I've been trying to say. For your information, i'm an ASE Master Certified Heavy duty truck technician. I think I know what im talking about. Yes, you can run a 400ex carb on a 300ex, but why would you go through the trouble, unless you signifigantly increased the displacment of compression? from the sounds of the mods he wants to perform, the stock carb, properly jetted, will work just fine for him.

[ridered46]

i was wondering about the 400 carb because i'm am looking to get a 313 or 330 bore and stage 3 web cam. Would this be a good combination? how is hendrick racing's porting considering the price. Also on the bore kit which is more reliable i'm doing a on/off road for gas mileage and was wondering? i was thinking about powroll, but i have heard 4 stroke tech is and cheaper like everybody i don't want to spend a lot. how much around is it to get a cylinder sleeved? i've heard that 330 smoke i was thinking tighter piston to wall clearance would fix that. if you get a 330 can you bore the cylinder agian if needed? thanks and any suggestions?

[Sjorge450R]

Rich at Hetricks knows alot. the only thing is, if you are sending your head in now, you are going to be looking at a 2-3month down time.

[Ryanwolfe911]

A 330 with a cam and high compression runs awsome, it's like a whole different bike, but take my word for it, DO NOT just bore your stock cylinder to 80MM to get there. That leaves the sleeve way to thin and it warps very easily, making the bore out of round and generally F'ing up the expensive top end you just put in. It's much better to spend the $300 to get a sleeve and piston kit. It's much more reliable and will save you money in the long run, and An oil cooler would be a good idea. And just in case you're wondering. i have a FST 330 kit and I run a 38mm flat slide Keihin carb froma CR500 dirtbike. It's a much better carb than the pumper style that's factory.

[Lt500rZilla]

is there any difference between a 4-stroke carb, and a 2-stroke carb? Can you run a 4-stroke carb on a 2-stroke dirtbike. ALso can you run an accelorater pump carb such as the edlebrock carbs on a 2-stroke. Thanks, for any info.

[Sjorge450R]

Originally posted by Lt500rZilla
is there any difference between a 4-stroke carb, and a 2-stroke carb? Can you run a 4-stroke carb on a 2-stroke dirtbike. ALso can you run an accelorater pump carb such as the edlebrock carbs on a 2-stroke. Thanks, for any info.

as far as I know, they are all the same.

[Lt500rZilla]

Thanks, that was something I was always unsure of.

[300ex mxracer]

they arent the same. 2-strokes have slides and needles and 4-strokes dont.im not sure if they are interchangable

[kingdingaling]

From what ive been told, the carbs arent interchangeable. And as far as not needing the bigger carb for a stock 300ex, the carb is really restrictive. If you do anything to improve the intake or exhaust, the 250x/300ex will benefit from a bigger carb.

[Lt500rZilla]

Almost every quad or dirtbike carb has slides and needles, even 4-stroke one's. That's how the gas comes out. the needle rises and more gas comes out. I was just unsure about the interchanging part about them it's something i've never done.

[Ryanwolfe911]

Yes Mr LT 500 is correct. Many, many 4 stroke engines use both flat and round slide carbs. there is no difference between a 2 stroke slide carb and a 4 stroke slide carb, unless the 2 stroke has oil injection that injects oil right into the carb(which was the case with an old Yamaha dirtbike I had) They are absolutley interchangeable. Trust me , I am running one right now,and I love it. Much better throttle response.