Maintenance & Technical > KX500 Original

Kick-backs for dicussion...

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Paul:
:lol: It doesn't bother me, I just can't imagine why that bike is doing that if everythings good.

John:
Well I think there are more out there who is experiencing the same problem. Could it be that this problem becomes more obvious when you ride the bike on tarmac (blacktop for you guys in the US)? I mean all of us so far are motarders.

/John

John:
Solved!

Having discussed this problem with a serously good mechanic he helped me to draw to correct solution - which I have verified. It's so simple when you think of it. :oops:

Problem; throttle not open but the engine still delivers power. It sucks air + fuel even though the throttle is closed = worn throttle! That's what you get for buying an old machine...

Bought a better second hand carburetor and the problem is gone. The new carb is Keihin PJ not the PWK which is the original for KX5. This carb is more biased towards off-road not MX. A bit too slippery outside today to verify all aspects of the mod but it seems to be OK.

The PJ throttle is oval not flat. And there are different models / sizes of throttles for different setups / bikes. I am not sure I can ever get this carb to work well with my bike unless I buy all sorts of throttles and needles and keep on testing. This will probably cost me more than a brand new PWK carb...

I will keep on looking for a newer PWK carb and see if that solves the problem.

/John

doordie:
Hello everyone!
You talk about kickbacks and i have had them to,only solution is a new carburator or fix the old one with new aluminum in the slide.Someone talk about buy a new carb... but i have somes friends here in Sweden who prefer LECTRON-carbs.. 38mm-48mm. They were very easy to "fix" to right jetting `cause only a a needlejet and a powerjet.They are is easy to reech to.We have a company here in Sweden who sells them(EBOS high performance), but they are from US,so it must be easy to get them for you,hehe.
Cost about 450-500$ (5000kr)here.I have not try one my self ,but i will....!

John:
The mechanic - Bengt from http://www.deltamc.se yet another Swede told me that the newer PWK cabs has a crome throttle and is less likely to wear out. I will se if I can find one of those before I buy a new bike...

/John (Sweden rules!)

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