kr150 probs

[kippy]

Hi i have a kr150 2005model.

it has about 24000km on the clock and the bike still moves, but when im cruising and rev it up to 6500rpm to about 7000rpm the bike just lose power as if im flooding the bike it sounds the same. i have clean the carb and air filter changed spark lugs and it stil does the same, but if i open it to full throttle it goes clean to 11000rpm but you can still feel it looses power. i can get about 180km/h and my friend has the same bike but with out the problems and he can get up to 190km/h...

can someone please help me.

[Racey Rider]

Have you checked what main jet is in both bikes?

The lose of power issue is common at that point right before the power valve opens. I have proved it get better or worse depending on what jetting your using, and even atmosphic conditions. I would suspect even the octane of your fuel could make a small change in that area.

Your friends motor may just be in better condition so running cleaner.
At 24000 km your ready for a new piston kit which is the first place to start before trying to tune out problems.

[CookMySock]

perhaps try a new sparkplug, or a better quality oil.

or just go for a long ride.

DB

[kippy]

oh ok. i dont what jets i use wil check on that. Wil it help if i use synthetic 2stroke cos i only use cheap shity ones i get when i fil up. have tried that2many times its not the spark plug and a long ride doesn't help either. is there anything i can do before i put in a new piston

[CookMySock]

Wil it help if i use synthetic 2stroke cos i only use cheap shity ones i get when i fil up.

YES!
Never put cheap shitty oil of any type in any bike.


DB

[Racey Rider]

Personally I don't think the KR150 motor is in such a serious state of tune that it needs Fully Synthetic oils. Even my race bike doesn't use fully synthetic.

[kippy]

Ok thanx. Whats the size jets that i am supose 2 use on the bike. I needed 2 drile holes in my air box to get the right amount of air but no it sounds like i have a cone air filter on the bike and i dont like that sound

[quallman1234]

Personally I don't think the KR150 motor is in such a serious state of tune that it needs Fully Synthetic oils. Even my race bike doesn't use fully synthetic.

Your race bike, is a completely different engine than a 05 model. The 2001 + models were actually somewhat good

Btw its probabaly an 03 rego'd in 05.

[koba]

I needed 2 drile holes in my air box to get the right amount of air but no it sounds like i have a cone air filter on the bike and i dont like that sound

There is your problem.
Tape them up.
What made you think that was a good idea?!?!

Also it important to note that you need to keep thing like powervalves and oil pumps adjusted on these kind of bikes.

Get a service manual and follow it OR have a shop do everything.

[Racey Rider]

Yes, I was going to ask if your model was infact the KRR150?

I can't tell you what main jet you should have if thats the case.

Drilling holes in air boxs can cause problems.

[kippy]

I have sent the bike in to a shop and they driled the hole and when i tape it up the bike wont rev higher than 6000revs and i think thats why they driled in the holes for more air. So i must have biger jets in or my carb are not tuned in. Were on the internet can i get a workshop manual. And what can be tuned on the powervalves wil they only open at higher revs. I have a krr150 it the new model it looks the same as the 2007 model acept its a 2005model

[kippy]

Yes whats the main jet size i wil see what size jets do i have this weekend

[sefer]

There are no manuals around, I think most KRR owners have looked everywhere. Apparently even the Kawa dealers don't have them (or so the shop said).

There is a very definite flat spot just before the power valve opens, and it sounds like your problem is just an extension of that spot.

I think you should start by fixing the holes drilled in your airbox, then have the valves checked out for a start. If that's a no go I'd be looking at doing the rings and piston. You can pick them up for under $100 and putting them in should be fairly easy without a manual, since all your really going to need to know is the torque values of the bolts, and that should be the same as any other Kawa using the same sized bolts. Even if not guestimating them shouldn't be too much of a hassle.

Doing that should hopefully eliminate any problems.

[kippy]

the prob is i dont have money for new piston and rings, and yes its easy to put it in. one mechanics told me its gets to much fuel but i"ll strip the carb and clean real good but yes i can feel i have lost a bit compression but thinks its got to do with the carb..maybe i have the wrong jets in or something is tuned out i cant see how it would be the piston or rings that can do that

[koba]

yes i can feel i have lost a bit compression but thinks its got to do with the carb

and what do you base this on?

Is this a pisstake?

And what can be tuned on the powervalves wil they only open at higher revs.

Not sure what you are saying here maybe try again in english.
The powervalves need to be kept adjusted.
If they are not you will lose top end power or end up with a mid-range flat spot.
If you can't find a manual try find some info on another kawasaki twostroke that is similar like a KR1 or somthing, chances are they use the same or a similar system.
It probably isn't too hard to work out anyway it is probably a cable or rod adjustment where you need to tightent (or Loosen) a cable or rod or two until the marks line up.


Oh wait, three words into google and....
http://www.dansmc.com/powervalve.htm

That could be a good place to start learning