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Hey guys I have been looking for a FMF Gnarley for my 1990 KDX 200 and it looks as if it is only available for 1995-2006 does any one know what years will fit the 1990

89-94

By the looks of my search I am SOL

FMF makes a pipe for the E series.... just 1 though.

If you've still got the stock pipe you can remove the inner wall of it which makes it pretty close to FMF pipe.

FMF makes the fatty how does that compare to the Gnarley, ..........how do you remove the inner wall??????

nice I am gearin that up for sure, can you do that with any factory pipe??

The KDX factory pipes for sure. Other bike may vary.

I remember a guy who did that who was a professional welder. We conversed back and forth over the process and he had some good comments about the project that I will pass along.


First this he said is , "I wouldn't attempt this project if I wasn't a professional welder, the metal is very thin and burns through easily and is very hard to get a good weld on it."

Second thing he said relates to the first comment about the metal being thin.... ".... the pipe is basically a tin can, any drop and it will dent like a tin can"

And thirdly.... "....the performance increase was nominal.... in my opinion, the mod was not worth the effort.... I am just going to buy a FMF"

So, I guess you can attempt it but be warned!

thanks, I have a few friends that are proffessional welders so I'll leave the dirty work up to them if I do decide to do it......I wish it was as easy for me to buy a FMF pipe because I love the silver finish as well but unfortunatly I need a 1989-1990 and FMF only make the Fattty for that year and it equals $$$$$$$$$ 309 for just the pipe

Head and carb work will net more overall, usable, seat of the pants gain.

First thing I did to my '02 220 was buy a pipe and fix the jetting. Jetting was $15, pipe was ~$200. I don't know for sure but I'd be willing to bet the pipe gain was minor compared to the jetting gain. I was thinkng the pipe would be amazing.

On my CR/KDX hybrid I had to weld new mounting brackets to the pipe in the expansion chamber area. Holy Cow, what a pain in the butt. I blew multiple holes and probably spent an hour welding, grinding, rewelding. This is with a Home depot MIG unit. I'm no proffesional welder, for sure, but not so bad. TIG would have been a much better process. A real welder with a real welding machine would have made short work of it.

If it were me, I'd put all effort into the suspension. A fella can go fast as heck with a weak motor if he's got good suspension. A fella can break his neck if he's got a strong motor and crappy suspension.

Just my thoughts....

Yeah I agree Karl think I'll hold off on the pipe, Just put a 12t sprocket on got a shock,clutch,gearshifter,rear fender from ebay, new rotor and pads for the back and new tires....I will wait till it is all installed before I go haywire....I just really enjoy tinkering I guess

what suspension work would you reccommend

Minimum of revalved/resprung forks....Add revalved shock(resprung if needed)....Scratch modding the forks in leu of swapping them w/ late model KX forks.

Shock is done so I shall do the forks