best 350x upgrades

[hondadozer3851]

Hey guys just looking for some cheap upgrades that will give me a little bit more power without breaking the bank i already a full cobra exhaust k&n airfilter an high comp piston i will be using this bike for tt and mx i have trail ridden this bike but need more power

[Mosh]

If your are going to mx and tt a 350x, the best advice I can give is to beef up the frame. They need it. Also look into suspension upgrades. Those will make you faster as well.

[Jason125m]

I'm not talking from experience, but I have read that many others have switched to a 400ex carb; they say it makes some nice power. And the accelerator pump makes the throttle response wicked. I've been waiting for a cheap one off ebay to try it out for myself.

[hondadozer3851]

Wat options do i have for suspension

[HONDA_ATC_FREAK]

You can have the rear shock rebuilt, revalved and have a new spring put in to fit your weight and riding style. You can rebuild the front suspension and put in progressive fork springs and choose a weight of oil to get your rebound to your liking. Or if your willing to spend the big bucks put a jason hall's invert fork kit on.

[hondadozer3851]

LlHow much does the inverted fork kit cost? And i can get a set of 250r forks for really cheap would that make a big difference?

[HONDA_ATC_FREAK]

the fork kit in the 3ww shop and is 550. but then you still have to buy the inverts which varies in price. my guess is you'll have around 750 in it all.

[RIDE-RED 250r]

LlHow much does the inverted fork kit cost? And i can get a set of 250r forks for really cheap would that make a big difference?

250r forks won't readily swap into your 350x triple clamp without having the triple clamp bored. The R forks are fatter and IDK if boring the X clamps would leave enough material for it to be strong enough for what you are looking to do MXing and whatnot.

It may be possible to convert your X to accept the whole R front end. I know the R has tapered bearings in the steering stem and I'm pretty sure the X has regular ball bearings (someone correct me if I'm wrong on that)....

Biggest thing is, when it comes to upgrading/modding these things, there isn't really any such thing as "cheap" upgrades that make a significant difference in performance. It all costs $$$.....

[travis i]

U can put in a 400ex CDI box as well. The performance stages will let u advance it n put a governor on trailprotrailpro rpms

[Furno]

Hey, guess what mate, i have a 2001 400ex CDI That I just got and don't need. It doesnt work on my 200sx. You can get it for what it cost me plus shipping if you want it. pm me.

-Dale.

[hondadozer3851]

By cheap i just meant not having to put a couple grand into it i understand it wont be cheap first i wanted to mod the motor first maybe a cam valves maybe bore it idk how big i wanna go i have a friend that can do all the bore work wat would be a good size to bore it out to or should i just go with a big bore kit

[hondadozer3851]

I have the 250r triple trees also

[RIDE-RED 250r]

When you talk about boring over... Wiseco only offers 2 overbore sizes in .50mm and 1.00mm which converts to .020" and .040" respectively. Don't expect big or even noticeable power gains boring .020 or .040 over stock. The purpose of oversize pistons such as these is solely to address a cylinder that is worn out of spec.

Here is a link to what Wiseco offers... http://www.wiseco.com/ProductSearch.aspx

Now, as you can see they offer 2 different compression ratio pistons, 10.25:1 and 12:1. It's been a while since I have looked at the Honda sevice manual for the 350x but I seem to recall that stock compression was something like 8.5:1. So, the 10.25:1 piston would be a noticeable improvement over stock. My brother has an '86 350x with that piston and when running side by side with his buddy on another 350x with the same exhaust and filter but with a stock piston you can see the machine with the 10.25:1 piston is quicker revving and pulls a bit harder through the gears. I think it's a pretty good "bang for your buck" option to coax more power out of an X.

Going with the 12:1 would be even a bit more improvement, BUT that piston will have you in race fuel territory. So keep that in mind.

Big bore kits are a totaly different animal than just a simple over bore for an over size piston. Powroll still offers big bore cylinder sleeve and piston kits along with stroker cranks for the ol' X. Check em out.. http://www.powroll.com/P_HONDA_ATC350X.htm

The difference is the actual big bore kit that nets you significant displacement gains involves replacing the sleeve with an oversize sleeve and piston. In some cases depending on the engine and bore kit the cylinder itself has to be bored to accept the oversize sleeve. All of this will add up a bit in labor expenses.

So in the case of the Powroll 393cc big bore cylinder kit you buy the cylinder kit, then pay the shop to remove your stock sleeve, bore the cylinder for the oversize sleeve (if necessary) then intall the new sleeve and bore it to match the new piston.

Then if you really want to go nuts there are stroker cranks available to increase displacement even more, plus cam, head porting mods and on and on....

Just wanted to make sure you understand the difference between boring a cylinder for an oversized piston and an actual big bore kit. Lots of misconceptions out there about displacement gains from a simple over bore.. For example, many think that .040" over gets you 40cc of additional displacement... Just not true. How much actual displacement is picked up by a given over bore varies based on bore and stroke dimensions of the given engine. But anyway..........

[Furno]

Whats the stock bore and stroke of the cylinder? its pretty easy to calculate the difference

[RIDE-RED 250r]

Whats the stock bore and stroke of the cylinder? its pretty easy to calculate the difference

81mm bore, 68mm stroke.

Look at the Wiseco link I posted. They list the actual displacement for the 3 different piston sizes offered. STD, .50mm (353cc) and 1.00mm (355cc)

[johnny's X]

Get a hold of eric or sprock and see if you can get your hands on a 400 kit. Best deal out there. Makes a huge power upgrade. Trying sending sprock a pm and getting info. For tt its better to have stock forks so you can lower the machine more. Would honestly be better to have tow diff front ends. Way diff riding styles.

[hondadozer3851]

that 400 kit is definitely something i will look into

[wannajeep]

I have been researching and got my hands on an FCR 37mm carb. I have a 1985 350x, k&n filter, polished pipe. Is this carb an option? Or should i just stick with throwing in the 400ex carb?