Big Problems! Im Stuck! Help!

[FDR492]

I have done an abundance of work to my bike in the last week, and i just got home from riding and my bike has dramatically lost top end speed and power, but never had any problems like this last weekend.

A list of work i did to my bike this week:

- Pulled off my head and cylinder and cleaned both
- Flushed and changed coolant
- Flushed and changed gear oil
- Flushed and changed gas
- Repacked my silencer

At first i thought it was because i repacked my silencer, but would that actually affect my powercurve that dramatically? Then after riding for a while and realizing it has no power and wont pull that long in each gear , it occured to me i m ight have damaged my rings when i put my cylinder back on. Should i do a compession test and see where i'm at? Perhaps i am due for a piston and rings anyhow.


Any ideas, please help me out.

Thanks in advance :|

 

[dirt bike dave]

Sounds like the powervalves are not working properly.

 

[marcusgunby]

On the KX when you drop the cylinder on you have to pull out the pv actuating arm very slightly -so the pin goes into the little groove between the the sandwiched washer.

 

[FDR492]

hmm ill go check my Power Valves right now and reply with a post before the night ends :(

 

[FDR492]

just went out , ripped my pipe off , pulled off the right powervalve cover, at first look everything was connnected properly according to some parts diagrams so i fired it up (wearing headphones :p) and reved it a couple times. I could see that the black bar that is connected to the rotator or actuator or whatever was moving up and down when i got to about half throttle, tell me , is this its normal routine or what?

 

[Glitch]

It should move farther up(or down) when you increase the throttle. Sounds like its working, but i'm not 100% sure.

 

[marcusgunby]

Sorry brain dead-the 00 povervalve was different-i was thinking of the 97, the 00 should have a arm that goes up and down like you said-it sounds like yours is working-did you remove the powervalves from the cylinder?

 

[FDR492]

hmmm i dont really want to remove the cylinder again......

 

[marcusgunby]

Just remove the head and operate the arm by hand-look to see if the flap in the exhaust port goes up and down.

 

[FDR492]

good idea

 

[Glitch]

Couldnt you take off the pipe and look in through there? That would seem easier, put only if you can see it through there.

 

[marcusgunby]

Yep with a torch that would work better.

 

[FDR492]

why with a torch?

 

[dirt bike dave]

torch is english for flashlight.

 

[FDR492]

gotcha;)

 

[FDR492]

Went for another ride today for about maybe 3 1/2 hours.....still runs like complete crap but i got used to the loss of power. Rode around the track for a little bit, felt like i was going jsut as fast as before, but my powerband was lacking. Feels like it tacs out aaround half throttle, and sounds really "Tinny" per se....like really hollow and deep , like a 250....i noticed a resemblance to the way my old '86 IT200 rode..... a lot of bottom end and no pull through the top......its really friggen' weird and i dont know whether or not i like it. Im beginning to think its just because i repacked my silencer and it sounds differently at certain RPM's than it did before, or possibly because i changed my oil and my gears are either running either the way they should be or the completely wrong way....hmmm im really stuck, but still undecided whether or not i like it and also what i should do. I'm thinking its not my piston and rings because i rode my friend's 125 when his top end was blown and he still had power ALL THE WAY THROUGH unlike mine where i have abso no power. And also guys, its not the PVs because thoroughly checked them once and once again :| :think:

 

[marcusgunby]

Are you sure the clutch isnt slipping?put it in a high gear at low revs-then clutch it with lots of throttle-if it revs instead of bogging then you have a worn clutch.

 

[FDR492]

that could realistically be it.....ill try it thanks

 

[FDR492]

just put it in high gear with low RPMS, pop the clutch and if it actually revs instead of bogging what does that indicate?

 

[cr25096er]

toasted clutch

 

[FDR492]

what should i do about it?

 

[marcusgunby]

1st check to see if you have 1mm of freeplay in the clutch lever-this is at the cable end -not the lever.At the lever you want maybe 5mm of free play.If you have freeplay then its time to see if the plates are glazed.

 

[FDR492]

wait hold up.....i was messing around with my barrel the other day because i had bought a new perch...could this be it? should i try loosening it? Good thinking though guys...because i always use my clutch when i shift and im thinking that could be it, the clutch problems revving it when i shift so it feels like it doesnt pull all the way through the gear. Its really weird though, like i can be riding with the bike in 2nd gear, pop it into 3rd and not notice a change in pull :p

 

[marcusgunby]

Yes you need to have free play in the cable-a new perch will need to be adjusted correctly.

 

[MikeT]

I love all this positive online diagnosis. Looks like (as always) Marcus is spot on. :yeehaw: Let me go and get some new "torch" batteries. :)