missing when revved.....

[motochamp250]

alright guys i need some help haha

when i ride my 250r it runs good and everything in like 1st and 2nd gear but 3rd-5th when u start getting in the higher rpm's it has a lil miss to it its not a huge miss ....u can juss feel it a lil and hear it a lil

i thought it could be jetting...but it only does this "missing" sometimes.....like it may do it for 3-5 minutes then about 5 minutes later when your riding it won't do it anymore...i dunno what is up i havent checked the plug or anything yet but i dunno....if u guys have any tips or advice as to something i can try...let me know

thanks, hunter

[SET THE STAGE]

i don't get what you mean by missing? like is it feel as if it has no power and like you have the clutched pulled in? or is it like the clutch is slipping?

[motochamp250]

juss like its almost as if its backfiring like when ur going through the rpms a miss like that......its hard to explain...sorry! its not a backfire but its like for a split second it has no fuel and misfires or sumthing....but i know its getting fuel ..kinda like it cuts out for a split secend

[TheFontMaster]

Check for air leaks in the intake boots, and exaust.

[SET THE STAGE]

yeah that definitely sounds like an airleak somewhere. go through your entire airflow system (air filter, boots, carburetor attachments, reeds, and pipe) and make sure there's no leaks/holes anywhere.

[wicked265R]

you should most deffinetly check your plug. the gap sounds a little off so check that. My cr250 would break up at high RPMs when I would start revving higher. My gap was off. might be your problem

[beerock]

go 1 stage higher on the main jet, if it gets worse, then go 1 stage lower.

sounds like its a bit lean though

[motochamp250]

yea bee thats kinda at i was thinking because my chrome paul turner pipe is starting to turn colors by the head...is that normal? i know how hot something has to get to turn chrome.....

[beerock]

well **** if thats not lean i dont know what is....

[dober250R]

could be leaking coolant into the cylinder and it's shorting out the plug............... just throwin that out there, i didn't read this whole thread, so don't bash me.

[motochamp250]

bee....is htat really lean? i thought it was but it runs fine...it only missis like this every once and a while......

[BLACKeR]

its lean

[beerock]

Originally posted by motochamp250
bee....is htat really lean? i thought it was but it runs fine...it only missis like this every once and a while......

yea when you run it hard it does it right? your a tad to lean.....

[C-LEIGH RACING]

If you running the old stock ignition system sometimes that will cause a skip up in the rpms.
Try as a test, set the plug gap 15 to 18 thousands & see if that clears it up. If it runs good after that then you will know its the ignition system.
Neil