Quick/cheap performance mods??

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Oct 25, 2007
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#1
Looking for a simple mod I can do to increase output. I did new reeds. Stock exhaust...not sure how much that would help. Have heard mixed reviews on exhaust upgrade. Going to go up one on the rear sprocket.....maybe two. I just want a good low end and midrange.....top end means nothing to me since all I do is track/trails.

CR
 
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Oct 24, 2007
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#2
Well, look for a aftermarket exhaust that has good low and mid range gain. Also a a better then stock filter.
 

Rich Rohrich

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#4
PROPER Jetting is the single most effective mod you can do to a bike, and oddly enough it's also the cheapest.

Go to any MX track and ask 100 riders if their jetting is sharp and 97 of them will say yes. More often then not 95 of them will be totally wrong and their bikes will be slugs as a result. Bolting on parts doesn't make bikes fast, tuning does. ;)
 
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#5
super juice or Ultimate 2 this stuff is the sh*! dump it in and do a little jetting, believe me it makes a difference.
 

BSWIFT

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#6
Rich Rohrich said:
PROPER Jetting is the single most effective mod you can do to a bike, and oddly enough it's also the cheapest.

Go to any MX track and ask 100 riders if their jetting is sharp and 97 of them will say yes. More often then not 95 of them will be totally wrong and their bikes will be slugs as a result. Bolting on parts doesn't make bikes fast, tuning does. ;)
Crisp clean throttle response will seem like a lot of ponies compared to a bolt on pipe. After getting my YZ jetted right, I haven't considered a pipe, I went for a flywheel weight.:)
 

D36-108A

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#9
What Rich said. Carburetion is everything.

As for paying a shop to "jet" your bike, only the guy twisting the throttle on the trails can jet the bike.

I have an 02 CR250 and when I couldn't get it to run consistently with the Mikuni I put on a Keihin. Then I applied the same basic carb tuning and got it running sweet and crisp. I later added a V-Force reed cage, which gave slightly better throttle response, maybe a little more low end. Race gas also helps with throttle response.
 
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#11
Easy Fix

Jetting the Cr's is simple.
First go one size down on the main.
Next the air screw on these bikes is , I believe , two turns out.
If you need more than two turns go to the next smallest pilot.
If you need less than two go up one size.
Before you buy a pipe just try a Power core 2 on the stock pipe.
It will work and if it isn't enough it will still work on the pipe you buy.
 
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#13
CANADIAN BACON said:
Jetting the Cr's is simple.
First go one size down on the main.
Next the air screw on these bikes is , I believe , two turns out.
If you need more than two turns go to the next smallest pilot.
If you need less than two go up one size.
Before you buy a pipe just try a Power core 2 on the stock pipe.
It will work and if it isn't enough it will still work on the pipe you buy.
It is simple, if you know how to do it....If not, you need to rely on a dealer.....which is the position I am in. A gear, Pro182 reeds, and a jet should wake it up quite a bit