need hepl power loss

[moey]

my bike had trouble going over 80km so i took my air filter out and put the box back and took it for a ride now going harder but now having trouble going over 120km

[YAM93]

better description required. please convert to MPH for us lazy Americans. Also what gears? Also what RPM's ? Also what mileage on bike... as in ... ODOMETER reading ? Also, when were carburetors cleaned last time ? Also how old are spark plugs ? Also how old is gas in tank ?

[moey]

to be honest i give it all the way because when it goes over 10000rpm i will loos a lot of power soo basically it goes better when its under 10000rpm

[csofos]

what is your bike? say more details. cause if it's fzr, they have an exup valve. If this valve cannot open, you'll have this problem. I have it once on both my 400 fzrs. First one fzr had cut exup valve cable, and the 2nd time had wrong adjustment.

[moey]

1990 model fzr250 it goes good some times and it doesnt go over 80 or 90kilmerters and some times my bateery dies but i bought a new one still doing the same the bike is giving me to much trouble

[moey]

have an exup valve where is it located and what does it look like so i can chek it up tom thanks

[yamaha_george]

have an exup valve where is it located and what does it look like so i can chek it up tom thanks

Hi,
EXUP valve is on the exhaust pipe right underneath the bike,. being a 250 does not say much how many miles has the engine done, are the plugs new / cleaned / do not know.

If you just bought the bike did you put fresh Gas on top of old Gas ? drained old gas ? run seafoam thro the carbs /engine ?

If you changed the battery & it has died already , what voltage regulator do you have (look it up on this site ) i it giving 13.6 volts or more / less ?

You have to learn to give more detail you are our eyes so we can make intelligent diagnosis for you .

[moey]

i think i found the problem on my fzr 250 3ln1 my exup valve one of my cable is riped a little from the end do use reckon thats for the power loss after 10 000rpm i cleaned my carbies and tuned my carbies soo now i know its not from my carbies

[csofos]

I told you about the exup cables. But have checked all these George told you uprights? If not, go and check them. George has too much experience on motorcycles. Since he's the oldest of us all, it's logical (sorry for the "oldest" George)

[DonTZ125]

Quick check to see if it's the EXUP (it probably is):

1. pull the left fairing
2. remove the EXUP cover (three little bolts holding on a piece of stamped sheet metal)
3. disconnect the 2 cable; mark which one was top and bottom
4. rotate the valve pulley CLOCKWISE as far as it will go, and wire it in place (safety wire, coat hangar, whatever)
5. test ride

You'll probably find you've lost a LOT of power on the bottom; you may have to feather the clutch to get off the stoplight a lot more than you're used to. You should however find a much different engine from about 9k on up...

[moey]

thaaaaaaaaaaaaaaaaaanks guys i done the exup valve where use told me to take the 2 wires of and turn it clock wise and i did noow it revs all the way to 19000rpm loving it thanks guys and yeeeh like what use said i will loos power and i did is there any thing to do to fix the problem of loosing power cheers

[DonTZ125]

Sure - fix yer EXUP!

Glad you found the solution; now figure out why it's not working right. You mentioned a damaged cable - is it the sheath, or the wire inside? Were the cables connected properly? Adjusted properly? Does the servo work at all? Does it go through it's cleaning cycle (zzzt-zzzt sound when you turn on the key)?

Have fun!

[moey]

yeeeh when i turn the key it it the diiz diiz twice but i think it was 1 of my cables was holding on like a piece of thread and how do i titen them up like use said thanks soo iam going to change the wire then see from there thanks for the help

[DonTZ125]

Once you've installed the new cable(s), turn the ignition on and let the servo cycle. There's a fork on the pulley and a hole in the housing; adjust the cables until the fork and hole line up (a 4mm allen key may help keep things aligned while you tighten the cables). The valve has a limited range of motion, <90 degrees; if it doesn't seem to be moving well, you may have the cables backwards. First part of the cycle is open (clockwise), then back to closed. Cycle the servo once or twice to make sure everything's lined up, then put it all back together - enjoy!

[moey]

does any one have a ny pics of the There's a fork on the pulley and a hole in the housing;