kev_rm

~SPONSOR~
Jun 7, 2002
196
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99 RM250. Using it for woods mostly. Love the power, but would like a little better behavior down low. Midrange is insane, and it seems like top end is just as good as midrange. I will probably get eric gorr porting (better everywhere) at the next top end rebuild, but am looking for a pipe to start. Currently stock except 13/51 gearing and FMF turbine silencer.

Is FMF Gnarley a good pipe for down low?
 

clumberjacks

Member
Apr 25, 2002
30
0
well, its hard to say. you have a rm and i have a yz. but its really on how you ride it. if your gonna pound on the gas all the time, then you want something like the fmf fatty or the powercore. i have the pro circuit which is also a great pipe for pit riding, but not too good in the woods. i think any aftermarket pipe is gonna make you bog. but if your looking at a good pipe to buy, i would go with the fmf powercore. my buddy has one on his cr and it is great.
 

kev_rm

~SPONSOR~
Jun 7, 2002
196
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Well, I'm pretty new to this all. Today was about my 10th hour on the bike - The thing has so much midrange power that it either wheelies or spins the tire in every gear, including 5th, going 50+ MPH. My biggest complaint is killing it in the technical stuff. Technique is helping, but it still doesn't have much power very low. I've thought about a flywheel weight, but I really do like the power on the open fireroads and stuff, and so don't want to snuff that with a flywheel weight.
 

RM_guy

Moderator
Damn Yankees
LIFETIME SPONSOR
Nov 21, 2000
7,045
208
North East USA
Before you waste your money on a new pipe, wait to see how you like Eric's porting. You may be surprized that you won't even need a pipe.
 

kev_rm

~SPONSOR~
Jun 7, 2002
196
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What is the turn around time on those? Is it even worth considering having this done locally? There is a guy near me that all he does is engines (kinda like eric..)
 

RM_guy

Moderator
Damn Yankees
LIFETIME SPONSOR
Nov 21, 2000
7,045
208
North East USA
Only Eric does it like Eric. There are good tuners and bad ones. I know Eric is one of the good ones and his prices are very reasonable. You'd have to check with him but mine took 1 1/2 weeks in the late fall. It depends on how busy he is.
 

kev_rm

~SPONSOR~
Jun 7, 2002
196
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I just did my top end rebuild, I was going to send it to Eric for porting, but logistically, it just didn't work, so I rebuilt the top end stock, and I've currently got a flywheel weight, torque reeds, and the stock pipe. The flywheel weight was the best mod for the woods.
 

little jeff

Member
Aug 20, 2002
126
0
Sounds like your jetting is off for low speed riding. Maybe try a different needle in your bike. Getting the best throttle response is all about jetting.
I have learned quite a bit since I just got back into riding about 2 years ago. Go to the 2 stroke section of this forum and ask around what guys are using for needles and jets for your bike. (CR,KX,YZ,RM section)
Little Jeff
 

cactusreid

Member
Jan 13, 2003
170
0
fmf gnarly pipes are great for useable midrange/smooth power. then again i ride a gasgas ec300. also flywheel weights help low end with out hindering top end punch. my son has a 00 yz 80 with a 12 0z flywheel weight for bush riding/that bike kicks but in the tight stuff.
 
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