1992 kdx 250 fast parts

JustinMiles · Post by **JustinMiles** » 03:40 pm Apr 15 2013

i have a 1992 kdx 250 and i want to know all the mods to get most hp out of the bike. Reeds, Carb work , exaust, or anything else and who is the best to send my cyllinder off to get ported out and polished by

Post by **SS109** » 05:13 pm Apr 15 2013

The KDX250 shares its reed assembly with the '89+ KX500. I like the Vforce III reeds but the RAD Valve is supposed to be good as well. For carb I would either suggest an RB modified 38mm Airstryker carb or possibly a Lectron or APT Smartcarb. There is not really any choice when it comes to pipes. Just find a good one (FMF, PC, etc) and run it. As for porting, I would go with Eric Gorr. He gives you three options, more low, more high, or more everywhere. BTW, he also offers a 265cc big bore kit as well! Good luck and keep us posted if you decide to build it!

royadams · Post by **royadams** » 08:46 pm Apr 15 2013

The first mod I did was kx 250 thin head gasket, fatty pipe and a lot of messing with the jetting. I plan on a gorr port job this summer.

JustinMiles · Post by **JustinMiles** » 10:07 am Apr 17 2013

Okay I will look into them I'm looking into taking it apart next weekend and will probably send it to him I see a lot of good reviews about him. And I may go with the vforce 3 reeds if anyone thinks different let me know

Post by **KDXGarage** » 10:28 am Apr 17 2013

Do they make VForce 3 reed assemblies for a KDX250?

Post by **SS109** » 06:54 pm Apr 17 2013

Jason wrote:Do they make VForce 3 reed assemblies for a KDX250?

Not specifically. The do make them for the KX500 (which shares the same reed assembly) or at least the last time I checked about a year ago.

Post by **KDXGarage** » 08:20 pm Apr 17 2013

OK. I was thinking V Force 2 was the most recent.

JustinMiles · Post by **JustinMiles** » 06:01 pm Apr 20 2013

Can I get a pro curcuit platinum for my kdx 250 and what website if anyone can find it

JustinMiles · Post by **JustinMiles** » 05:15 pm Apr 21 2013

Has anyone heard of putting a 6 speed transmission in a 1992 kdx 250 and if so could you tell me how to and what the cost would be

Post by **SS109** » 04:49 am Apr 22 2013

JustinMiles wrote:Can I get a pro curcuit platinum for my kdx 250 and what website if anyone can find it

I don't think so but check Pro Circuit's website.

JustinMiles wrote:Has anyone heard of putting a 6 speed transmission in a 1992 kdx 250 and if so could you tell me how to and what the cost would be

No, there is no way feasible, that I know of, to put a six speed in the KDX250. Why would you need or want to?

JustinMiles · Post by **JustinMiles** » 06:28 am Apr 22 2013

I just always liked 6 gears feels like I always need another gear when I'm going on it , so it's no bottom end swap I can do I know the klx 250 ha a 6 speed any possible way my top end would fit on it

JustinMiles · Post by **JustinMiles** » 07:25 am Apr 22 2013

Roy Adams where did you get the thin head gaskets from and what machine did you get it from

Post by **SS109** » 12:01 pm Apr 22 2013

JustinMiles wrote:I just always liked 6 gears feels like I always need another gear when I'm going on it , so it's no bottom end swap I can do I know the klx 250 ha a 6 speed any possible way my top end would fit on it

The KLX250 (4 stroke) is a completely different design than the KDX250. I know I have had my 250 up to almost 85mph and it still had plenty left even with only 5 gears. Remember, it is a 2 stroke, they are meant to be revved!

JustinMiles wrote:Roy Adams where did you get the thin head gaskets from and what machine did you get it from

You want one from the '88-'91 KX250. Just make sure you order the one that is .26 thickness and not the .46. BTW, you have read this thread, yes? http://kdxrider.net/forums/viewtopic.php?f=134&t=13319

royadams · Post by **royadams** » 08:40 pm Apr 22 2013

Yep the 88 91 kx 250 metal gasket. It make it even more of a beast. make shure you run premium fuel in it if you run that gasket.The kdx 5 speed wide ratio is great . 5th gear is overdrive allready. If you get your bike jetting dialed in you will be amazed. What jetting are you running now.

JustinMiles · Post by **JustinMiles** » 09:01 pm Apr 22 2013

idk exactly off hand but my buddy works on them and we installed leaner jets and it made a world of a difference it rips a lot better now but i know its like 3 or 4 numbers smaller than stock size jetting

JustinMiles · Post by **JustinMiles** » 09:02 pm Apr 22 2013

and by premuim fuek do you mean 93 octane (thats what i run) or the 110 octane

royadams · Post by **royadams** » 10:16 pm Apr 22 2013

Yea 93. To get mine jetted I had to go to a 35 pilot 2 turns out on screw, 155 main, #6 slide and two needle sizes leaner. I have head gasket,fmf fatty pipe, fmf turbine core silencer, boysen reeds and an opened up air box lid. And I recently stuck the engine on a rm 250 chassis and installed a auto clutch. Now I have a tru woods weapon. If I rode open roads I would have just kept the kdx chassis it was better in a straight line but sucked on single track where I ride

JustinMiles · Post by **JustinMiles** » 07:47 pm Apr 23 2013

When you mean open the air box you mean you took the lid off? Because mine has no lid on it already

JustinMiles · Post by **JustinMiles** » 08:43 pm Apr 23 2013

Could someone give me a web address of the head gasket .26 thickness so I make sure I get the right one thanks

royadams · Post by **royadams** » 10:05 pm Apr 23 2013

I just cut my top open so I could leave my cdi box bolted to the lid. Gasket p/n 11004-1236 you can find them on eBay or kawi dealer.

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