Hi everyone. I have a kmx 125 which i love! But the only this is that when i full throttle the bike. It over revs after 6-7 thousand ( not powerband lol) and looses power. Now i thought this was the clutch so i go a new one. But then after recieving it. Its impossible NOT to stall the bike. And took it to my friends grandad who is a master with all motocross bikes. I.e after every race my friend has his whole engin re-furbed and cleaned new oil ect. He wasn't too sure what it could be. I think it could be my power valve sticking open after looking on web. But not 100% sure on how to fix this. Im pretty sure its not restricted as i can still hit 80+ no prob. Just have to fether the throttle so it doesn't spin!! HELP!
KMX 125 PROBLEM PLEASE HELP!
Posts 12 | Views 2800
Jaffa wind yea neck in ooooo, i do luv two strokes
Hi Joshy1992 and welcome to the site
Am sorry mate,i don't understand what you mean at all,are you foreign and translating into English ? what is your country of origin?maybe Master Grandad should take another look see!
haha im not foriegn!!! lol. Basically. if i start from 0mph and full throttle 1st 2nd 3rd ect.. when the bike picks up from say 6-7000 rpm. Its looses power and goes from that 7000 straight to 10,000rpm. Almost like the clutch is slipping.. but the clutch is fine. had it out and checked all over. Only thing left is power valve. but not sure what to do here. Grandad has moved away so hard to get to now! . Its not clutch because its impossible to NOT stall it.
Kawasaki KMX 125 year?model?
Hi again Joshy1992
I would not say this is a power valve problem,if the valve was stuck open you would feel a lack of drive at the bottom end of acceleration,if it was stuck closed(which is the most commen situation)you would feel or have no top end RPM and the engine would not get into its power band as effectively the exhaust port is partially blocked with two barrel type power valves.So i hope you understand this?,so now its down to have you rebuilt the clutch properly?and have you put the correct oil in the gearbox?(what oil did you use?) if you are confident you have then i would say with the very sketchy information you have given its more than likely the chain jumping over the sprockets as it hits the power band. Check the engine drive sprocket for severe wear or teeth missing and the rear for much the same.Good Luck
Reply to KCMC
I took the bike like a said to my friends grandad. He already had the stuff to hand. as he has 1 kmx 125 1 kx 125 1 kx250 four stroke. and 3 KTM 250 two strokes. Which he enjoys to play with! lol. Anyway im not too sure what stuff he uses. On the mot recently it had new chain and sproket hit so doubt its that. But when i take the powervalve cover off (right hand side not the one with 'kips' on it) and rev it. it does open but stay slightly open a bit when letting off the throttle. Almost like its sticking? But i believe taking it to a motorbike garage wont help as when i took it to the local garage. He goes - needs hell of a lot mate. I said like what. He said not sure but can imagine a list. Took it to my mates grandad and he called them and said he's coming down to discuss. They didn't want to know then. But now the old F***er has moved away and left me in the dark! .
If the revs jump from 7000rpm to 10,000rpm WITHOUT any increase in speed, then either your clutch is slipping (that's my bet), the chain is jumping over the sprocket teeth (it would make a hell of a noise too), or you're spinning the rear tyre up (the bike ain't powerful enough for that).
Just because it stalls doesn't mean the clutch ISN'T slipping. I reckon the clutch is goosed.
Just a thought
If, as you say you've fitted a brand new clutch (after soaking the plates etc) have you checked the condition/routing of the cable? If it's frayed or kinked somewhere it may cause the symptoms you're describing
If History has taught us One thing....
It's We've learnt None of Histories Lessons!
Reply to all.
Thanks for your help guys! I never actually fitted the clutch as he said it didnt need it! I take it this is going to be my problem!! Can anybody advise what i'll need. I already have new clutch plates at home..
"Can anybody advise what i'll need"
A spare weekend and unlimited tea.
Knowledge is knowing a tomato is a fruit
Wisdom is knowing not to put it in a fruit salad