[230@#)]

I want to do the power up kit, but I am not 100% sure on how to reject the carb, I read the 450 jetting how to article and got a pretty good idea, how close are the 450 carb and 230 carb. It would be awesome if someone could post a how to or a link to one thanks.

[Asmith]

http://www.rickramsey.net/CRF230Fcarb.htm

[230@#)]

so really all I have to change is main jet when I remove the air box snorkel and exhaust baffel, becuase the new needle is the same as stock.

[gal8x]

Some people don’t change to the power-up needle they just change the clip on the stock needle. The power up needle I installed had a different taper at the end it is Honda part#16012-KPS-921, the stock part#16012-KPS-731.

If they were the same part then I would think they would have the same part number.

[JohnnyT]

I screwed up and mixed up the stock needle and the power-up needle. Can someone tell me what number is on the stock and power-up needles? I can see that one is a lot fatter than the other. And what effect does one have over the other?

[gal8x]

I screwed up and mixed up the stock needle and the power-up needle. Can someone tell me what number is on the stock and power-up needles? I can see that one is a lot fatter than the other. And what effect does one have over the other?

I remember clearly. The stock needle has a gradual slope to a sharp point and the power-up needle is thicker and it terminates more abruptly, like a center punch.


i have never used the stock needle with the power-up jets.

[JohnnyT]

OK. My stock needle, the thin one, with a gradual slope, has the number "C39A" on it. The power-up needle, has a (I think) "C30". If you use the thin (stock) needle, more fuel will can discharge from the main jet. Has anyone ever used a power-up needle with stock jets? I think it would run lean, but I'm at 6000 ft.

[230@#)]

what main jets do people usually use when they do the power up needle, and Remove the air box snorkel, and exhaust baffle?

[Asmith]

what main jets do people usually use when they do the power up needle, and Remove the air box snorkel, and exhaust baffle?

132 is most common.

[Aussiecrf230]

Just remember with carb needles that the lower part near the point never leaves the needle jet.

Basically when the C30F power up kit needle gets to the straight section the carb piston is at full throttle.

The stock C39A is narrow after that but does not provide additional fuel, that is what the main jet is for.

Try the 132 Main but depending on height above sea level and ambient temperature you may need to change this. Look at the jetting sticky ~ started as a guide.

You can get away with the standard needle and run at least a 120 Main.

If you have better after market aircleaners/exhaust get the C30F.

My bike came with no baffles, snorkel removed and a 112 Main and funnily enough did not have any top end.

Rejetting with just the bigger main let it rev cleanly.

Let your spark plug be your guide.

Have fun.

[230@#)]

Does anyone change the pilot jet when doing the power up on your bike? And what do you mean let your spark plug be your guide? And Thanks for all the other help you have all given me, I dont know what I would do without CRFsonly.com and and all the members.

[JohnnyT]

I put in a 132 main jet, 45 idle jet, with a power-up needle and it worked very well @ 6000 ft. But when I hit the trails @ 7000 ft plus, the bike didn't idle and when you open the throttle it would want to take off on you. To much fuel? I'm going to start over, with stock jets and needle, and change one thing at time. It will let me get out more often.

[gal8x]

I put in a 132 main jet, 45 idle jet, with a power-up needle and it worked very well @ 6000 ft. But when I hit the trails @ 7000 ft plus, the bike didn't idle and when you open the throttle it would want to take off on you. To much fuel? I'm going to start over, with stock jets and needle, and change one thing at time. It will let me get out more often.

i can't say from experience but here are some links that might help.

http://www.thumpertalk.com/forum/archiv ... 04024.html
http://www.horizonsunlimited.com/tech/carbjet.shtml
http://www.kodiakbs.com/PDF/mainjet.pdf
luck

[JohnnyT]

Does anyone change the pilot jet when doing the power up on your bike? And what do you mean let your spark plug be your guide? And Thanks for all the other help you have all given me, I dont know what I would do without CRFsonly.com and and all the members.

If you change your main jet, you can run you bike and then remove the spark plug (after it cools). Then look at the electrode. If it's black, to much fuel, if its white or a light color, to lean. You want a nice tan color. You should ride the bike for about 1/4 mile @ 1/4 to 1/2 throttle pull in the clutch, and kill the motor. I don't know about the idle jet. Try doing a search. Can anyone else help out here?

[Aussiecrf230]

Probably at 7000 feet the stock 42 pilot would be ok.

As would a main smaller than 132.

I ride at sea level to 1000 feet and the 42 is ok in summer but needs the 45 in winter.

~ found the 48 pilot worked on his 230, but an after market exhaust was installed, so the little extra fuel was needed.

It is generally a case of trial and error to jet your bike for where you ride. Take anyone elses advice as a starting point and tailor the jetting to suit you.