125-200cc I Rode The Prototype Wr200 And It Is Amazing...

Cheko,

That pipe was a very quick slash and dash weld together. It would actually fit better with it tipped slightly counter clockwise as you look at that side. Plenty of clearance between the pipe and tire to move it up a little and drop the rear stinger so it misses the shock reservoir. As always live and learn. These projects make winter in Montana go much quicker.

it really is awesome walt and i cant wait

Over at ktmtalk Clay has been building a 170 for quite a few years. It uses a 200 cylinder on a 125. So I think maybe a 165 Husky would like the same pipe as the 170 KTM. I think Clay prefers the 200sx pipe also but he might know of more good options. Anyway here is just on of many post on the subject
http://ktmtalk.com/index.php?showtopic=95436

Is that the KTM pipe? Sure hangs down really low! I can't wait to try it on Saturday!

Ajaxauto talked to the guys at FMF and they aren't interested in doing anything that only has minimal demand= <25-50. I am hopeful that we can talk Dynaport into doing a run of pipes purpose built for this application. Norman Foley has offered to use his bike as a model.

Guess you need to be a member to view it.

I am a member as I have bought used 200 pipes there. Basicly says a lot of what we have been saying hear. Did point out that there were significant gains everywhere in the power band using the 200 sx pipe versus the 125 pipe. His kit was $1600 in 2005 and you have to pull the motor completely down to change rods. You have to re-port the entire 200 cylinder to get the port timing back with the shorter stroke. Probably a fairly reliable kit and sounds like it runs just about like what we are seeing with the 165 and the sx pipe. Obviously changing a 125 KTM to a 170 is a lot more involved than what we are doing.

this would be great

this is the only pipe i have at the moment (FMF Fatty) so i'm really interested as well.

my kit will be here today, IF i can get away from work, i'd love to slap the kit on and test this weekend.

Since Clay is a friend of mine will simply say the 170 was his passion and he did a lot of revamping as he went on those projects and they continued to get better very strong mid and low end.

As for the comments on SX 200 pipes, I will offer the horsepower numbers Clay uses for his posts were taken from my 04 SX 200 and we tried every pipe on it. The Doma was without question the pure horsepower king and will not the most rider friendly it did have the hardest hit. The FMF and Stock KTM pipe were both similar on the SX 200 and think my stock SX 200 pipe actually ended up on a 170 that Clay built. The FMF offered a very broad range within the lower mid through lower top. The Pro Circuit SX 200 pipe was all top end and was soft in low and middle. That seems to mirror exactly what Walt defined on the 165 modified pipes as well.

I also owned a RPM Yamaha 167 and will tell you that it ran pretty much the same whether it had FMF/Pro Circuit/ or Stock. The difference with it was a bigger bellied pipe and that was the one Dyno Port offered.

Interesting is that the KTM even the 170's Clay built ran better with 38 K as opposed to the 39K that the SX 125 and SX 200 both came with. Yet in the RPM big bore/stroked 167s the 38 M carb was the best selection even when Yamaha went to the smaller 36.

I am in process of Walt finishing up my 165 and look forward to getting it back together.

I'm trying to shuffle some things around to make it down, would like to try the 165. I will bring my WR250 just in case I can tag along for a loop or two.

hay kel what day are you coming to australia ill put u up for a week or twoLOL

I can't wait to read the conclusion

Thanks to Kelly for letting me ride his bike. It was everything he said it was. The low and mid snap reminded me of my '06 KX250. I have definitely lost the art of throttle control. I rode it up a mountain switchback trail that had some steep sections. His 167 was geared close to my 144 (low) and I never had to use the clutch. From off idle you just grab a bit of throttle and hang on.

I initially started riding it like my 144 and had a bit of trouble keeping the front tire on the trail. Shifted up a gear and the front end stayed down better and would still accelerate up the hills. As you can tell I am really impressed with the motor. I rode my 144 up the trail afterwards and I was on the pipe to maintain my momentum in places I was a gear higher and loving the lug on Kelly's bike.

I am truly amazed that 23cc could make that much difference -seat of the pants I would have said it was at least a 200.

Looks like I'll be in line to upgrade my 144 not that I had any doubts! Thanks for the ride report.

Interested to know the gearing Kelly's bike was running.

Well, got another shot at riding the 165 today, and there isn't much I can say that hasn't already been said... This motor is STRONG... If I had to sum it up, I would say I can pull everything a gear or two gears higher than my 125. At the end of the day, we took a couple mile hill climb that has some loose rocks and technical sections. This bike is very very forgiving. It is nice to have that extra power when you need it. Coming up to a root wad mid hill, it is easy to snap the throttle to get the extra power needed to get the front wheel to lift itself over. On my 125, you have to be on your game, and give the clutch a pull, while pulling up on the bars to pop the wheel.

I would say this kit can make your riding style a little lazier, or a little scarier, that part is up to you.