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.:)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. ;)
devll1 said:oh um sorry to cut in but isnt a sprocket really effective or no?im curiuos also
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.
devll1 said:sweet i am gonna get a sprocket now that i no its actually affective :nod:
I tried way more jets than that.............and finally got close. And no the other carb didn't fix my problem. The S4 nozzle really helps the 2002-2003 CR 250's........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.
flyingfuzzball said:you cant go with what he has. there is no PERFECT jetting for every condition cuz it is affected by temp. altitude, fuel, and what premix you use. and like a billion other things.
as for if you dont know how to do it.... it really isnt that hard. im sure you could find someone to help you do it the first time. thats what i did. i got my dad to help. now if i need to rejet i know how to do it.
also i believe sending the engine to eric gorr and having him port it for bottom end has good results for the money spent.
also getting your suspension set up is a great way to be faster.
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