2003 250 for off road use-info needed

[highmileage]

Well, some twist of fate and found a 2003 YZ250 in pristine condition (ridden once and obviosly so) for a bargain price.

I will be setting it up to ride tight woods and more open GP's. I completed a search and I am pretty confident in my plan, but have a few questions. Main goal is to have very smooth/broad/hitless power delivery.

FMF pipe and sparky; which combo (leaning Fatty/TCII Q)

9oz or 11 oz flywheel weight (leaning 11 oz)

stock gearing is 14/50 thinking of 13-14/48, thoughts?

single taper needle like DDK or CCK?

 

[Chris_S]

I have an 11oz. and like it a lot.

I'm very happy w/ the stock gearing...it gets me through all the tight stuff I need, yet has enough top end for my needs.

I have no exp. w/ FMF exhausts, but I have a PC Plat. II and long silencer, along w/ a V Force3, and it rips!

 

[Studboy]

I love my 02 YZ250 for offroad.

I usually go to a 13/49 for really tight stuff, but leave the 14/49 for more open trails.
I bolt up the 11 oz flywheel weight and turn the clickers out on the suspension a bit. Raising the forks in the clamps also helps.

I've found the stock pipe to be the best offroad pipe for me. I haven't had the need to change the needle, but having the proper jetting all around is important for smooth low end response.

 

[Lorin]

I have an 03 with the FMF Fatty, and it is a little abrupt. It has great power (especially for mx), but is a little bit of a handful in the tight stuff. I have ridden back to back with a pro circuit pipe, and the pc pipe seems to have a smoother transition. Made the bike almost electric. I also put in a delta reed (from my 98) and an 11 oz flywheel weight. I havent seen the need to change the gearing at all. The only thing I have considered changing is to a pc pipe. I am running a spark arrestor as well, which is considerably quieter than the fmf silencer.

 

[highmileage]

Lorin, Are you stating that the Platinum or Platinum II is the way to go with the silencer? Are you using the woods friendly or 296?

The other thought was a v-force III, worth it?

Once summer break comes I will send it to EG and get Mo Better porting to accentuate the positive. I want more electric than most.

 

[2-Strokes 4-ever]

The Yamaha has a really good woods motor. Hawk, (GNCC guy) says he prefers the FMF gnarly. (Although it didn't seem all that "magic" on my RM). I run a FMF Q, good power and I feel it is an important sound issue these days. V Force is good stuff, more power, crisper response, friendlier delivery. Leave your reed spacer in for smoother hit. More head-pipe length will make the motor "gruntier" too, (add 2-3 washers to exhaust port before pipe goes in). Or, does the Yamaha design let you do that? Don't know for sure. Have buddies that go from 6-12oz flywheel weights, just depends on your terrain. I think gearing is a terrain thing too, here in tight, rocky Missouri, adding 1-2 teeth to rear is usually the standard, for a "B" caliper rider, on an MX-converted bike. Enjoy!

 

[Orangeman64]

woods yz creation

Hey guys, I just started riding a 2000 yz 250 a couple months ago, mainly riding woods, but play a little on the tracks(I'm 40 so the jumping thing can be a little intimidating with all this new power). I just put a 9 oz fly wheel weight on, a FMF gnarly and a power core II exhaust. I also added a skid plate, frame guards, and almost most importantly for the woods a good set of barkbusters(only took 1 tree to make me buy those). I hope to get out this weekend and try out the fly wheel weight and new exhaust system. Will then have to decide if rejetting needed, fmf sends a sheet on what they recomend as far as the jets with the new set up specific to your bike.