In theory the shape of the pipe is everything for a 2 stroke.........some aftermarket pipes just don't live up to their claims, and the factory pipe is a good piece. Especially considering you can get the cylinder ported cheaper, and it should make a bigger difference. Guess I'm about to find out.....can't believe I thinking of pulling a bike apart that's still on it's first tank of fuel! :blah:skipn8r said:I read about the Doma in a Dirt Rider test and got mine from Langston Racing. I actually put it on before my first ride on the bike, and worked on jetting the bike with the PWK. After getting a good jetting baseline, I ran some back-to-back exhaust comparisons between the stock pipe and the Doma. It certainly seemed to me that the Doma was noticeably better off the bottom; like when rolling on out of a corner. I didn't have much space to compare the top end differences, but at worst, they seemed similar.
I bought the Doma un-plated and it looked very high quality; nice welds. I went ahead and had mine plated locally (just to prevent corrosion) when I found out it was mild steel. It bolts on a little easier than the stock pipe.
When considering my opinion, also know that I'm new to 2-strokes, so I don't know how much a pipe should affect the powerband.
pace said:My Mo-Betta '03 CR250 comes on harder than any stock displacement 250 I've ridden. That's probably accentuated by the relatively weak bottom end, but it does pull into the powerband much quicker than the lazy-feeling stocker. The midrange is simply awesome, and it signs-off a little later than stock too.
Eric Gorr said:Hi Skip,
The 2002-04 top ends interchange but the 03 is the best design stock. Its best to just port the stock cylinder because the cylinder is very thin and boring it oversize makes it less reliable but its a cheap fix if the bore ever gets trashed from a broken ring.
The difference in the KTM is its 15 years newer than the Honda. The exhaust valve system with the triple exhaust combined with low and wide transfer ports is the key. Remember the 2002-04 CR250 engine is actually an older generation than the previous 1992-2001 engine. The 2002 CR250 originated as a dual sport bike in Japan in 1988.
If you like the KTM then buy a KTM because no amount of money is going to make the 2003 CR250 the same as the KTM.
Good luck, Eric
Eric Gorr said:Hi Skip,
The 2002-04 top ends interchange but the 03 is the best design stock. Its best to just port the stock cylinder because the cylinder is very thin and boring it oversize makes it less reliable but its a cheap fix if the bore ever gets trashed from a broken ring.
The difference in the KTM is its 15 years newer than the Honda. The exhaust valve system with the triple exhaust combined with low and wide transfer ports is the key. Remember the 2002-04 CR250 engine is actually an older generation than the previous 1992-2001 engine. The 2002 CR250 originated as a dual sport bike in Japan in 1988.
If you like the KTM then buy a KTM because no amount of money is going to make the 2003 CR250 the same as the KTM.
Good luck, Eric
My engine mouting plates were a tight fit before mods. Maybe mine is odd.mtk said:Eric Gorr ported my 2002 CR250 and I didn't have to modify anything on reassembly.
X men said:An what is your opinion on the fact that ktm decreased the diameter of the carb to 36 in stead of 38 on the 05 model ?
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