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Sounds like a bent shift fork. While accelerating you can feel the power cutting in and out quickly. The problem will get worse if you keep pushing 2nd gear till it slips. You can learn where (at what RPM) it wants to jump out and start shifting before it jumps out. The long term fix is opening the transmission and fixing the bent shift fork.
Full disassemble of carbs is needed. Thorough cleaning on jets and airways, vacuum and pilot screw adjustment must be done too. Check the spark plugs for lean mixture indication and replace them if necessary.
Well, I've have heard of this problem before but I've never seen it for myself. I wrote a opinion here just the other day concerning this problem in a 1990 bike.
This is unusual. I'm afraid that if your transmission is doing this, you are going to have to do at least a partial teardown of the transmission.
I could be that the shifter cam is not rotating fully to put the 5th gear clutch dog into gear. This would cause just the tips of the lugs to be driving the final drive gear. And, it could jump out and back in from time to time.
Now, why the shifter cam is not rotating fully is the question. If the rest of the gears seem to be shifting fine, I wouldn't think it was the shifter pawl but it could be.
If it were mine, I'd remove the exhaust system and whatever else needed to gain good access to the the transmission top cover. Remove the cover and raise the rear of the bike off the ground. Now, you can shift the transmission and watch the actions of the shifter cam. Pay particular attention to the 5th gear shifter fork. See how much "play" the fork has once it's shifted into gear. You may spot something wrong there and be able to repair the problem without pulling the transmission out of the frame. If not, you may have to pull the entire transmission or at least the trap doors with the shafts to inspect the final drive gear. You may wind up replacing the final drive gear if the clutch dog has been jumping in and out of gear.
One other thing. Have you checked your front belt pulley? I've seen the splines in the pulleys wear to the point that they just strip out and won't pull the bike in any gear. Check that before you start tearing down the transmission. Usually when this happens, (excessive wear on the front pulley) it is accompanied by a small transmission fluid leak. If you ride the bike and park it, it'll leak a spot about the size of silver dollar. If you wipe the spot up, it won't leak again until you either ride the bike again or start it up. Then, it'll leak again. The transmission fluid is leaking past the "quad seal" behind the pulley.
hi, if when you start your bike you press the gear lever down to go to 1st from neutral and then pull it back up to go to 2nd,3rd,4th and 5th then the only way to get back into first gear is to press the gear lever down 4 times to get it back into 1st gear their is no quicker way to do this you have to work your way back down the gears.
if your coming to a stop quick then just pull the clutch in and keep pushing the lever down until it dont push down any further it will only go down 1 gear at a time so you will need to push it down 4 times but you dont need to count you can just keep pressing it down the gears until it dont go down any more then you know this is first, you need to keep the clutch in when doing this.
how ever if your slowing down is more gradual then what you can do is go from 5th down to 4th then let engine slow the bike down then when the revs drop down change down to 3rd and so on until you get ot 1st gear.
if your coming to a stop quick say at lights or junction then if the bike is in 5th gear then you can change down the gears once the bike has stopped just hold the clutch in when you stop and keep tapping the gear lever down until you feel that its not going down any more gears this way you know its in 1st without having to cound down the gears, their id no quicker way of going down the gears to get to 1st.
i hope i have read your question right and gave you the answer you was looking for if i got the question wrong then please explain then i can assist you further ok
Wave washer on the face of the clutch basket may have lost its tension, clutch friction plates may be wearing thin as she's an old girl. Some automotive (car) oils not specifically designed for wet clutches when used in a bike will cause the clutch to slip as they are designed to leave a deposit on friction areas. This will require a thorough flush and a few oil changes in quick succession.
Check the return function of the clutch release arm on the crankcase, they can bunch up the rubber shroud and not return fully. Good luck and Cheers.
pull your clutch in on the left handlebar push the shifter lever down and let you clutch out slowly while giveing the bike a lil bit of gas. But if you don't know how to ride i wouldn't be jumping on a kx 250
Theres fuel starvation, the carbs are not getting required fuel in other words the float chambers doesnt get the correct amount of fuel .
Check the fuel flow from the petcock to the carburators.
Check the float pin and adjust accordingly to get the right level inthe float chamber of each carburator.
Hope this helps!
Sounds like the carbs are getting starved for fuel as load and rpm's increase. Start with Jack's suggestion on the fuel filter and get a new one. If that doesn't do it check other items in the fuel delivery circut. Rust or scale in the tank plugging the pickup dried out fuel lines that are semi-collapsed dirt and grit in the carbs - stuff like that.
Fuel delivery problems typically seem to manifest themselves in the higher gears under load. They don't show up in the lower gears when accelerating simply because the bike pulls through them so quickly. If delivery is barely adequate, it has a split second to catch up when you shift. As the duration of uninterrupted load increases, it will run out of gas before the next shift. Typically, they fire right back up after you pull over and let them sit for a minute with the fuel pump running. Does your bike do this?,,,