Maintenance & Technical > KX500 Original

KX500. non sealing exhaust header pipe

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WRXBRUMBY:
hey guys first post for me, and new to the KX500 beast. will a non sealing exhaust header pipe cause the engine power to cough and splutter from mid to top rpm?

KXcam22:
WXR,
I don't think so.  As I recall, pipe sealing improves low end power. I suggest that you check your jetting with the jetting chart as a starting point.  It sounds like it may be too rich. Also check for an 8 heat range plug.  What oil and ratio are you running?  All these things interrelate to a certain extent. Hope this helps. Cam.

WRXBRUMBY:
cheers for your reply cam.  :wink:

i am running 1 jet size below standard, 30:1 fuel mixture (this too rich?)
just had motor rebuilt seals/main bearings, new conrod, new cylinder plating with piston and rings. hehehe for an exhaust pipe that is not sealing properly she has crazy amounts of bottom end and a good half a hit of mid range. it feels like it wants to explode into band but just breaks up from there on. The bike was on its first ride since rebuild, and really my first ride on it as well( hehehe im still a virgin when it comes to the fury of the kx500 power band :oops:)

i tried to do second gear burnout on the spot just to have a controlled load variable to test it with and it did it exceptionally well in the bottom end but when i opened her up it just died. spark breaking down you reckon?

is there a timing advance on these machines?(sorry if its a stupid question) cause i feel that the issue is to do with rpm and not throttle load.

p.s this joints awesome hehehehe my first forum

KX500freak:

--- Quote from: WRXBRUMBY on May 31, 2008, 09:19:31 PM ---hey guys first post for me, and new to the KX500 beast. will a non sealing exhaust header pipe cause the engine power to cough and splutter from mid to top rpm?

--- End quote ---


welcome  :-)

i,m with Cam about the diagnose,
mine is also been mixed 30 to 1 by accident and that gave for my bike issues like yours.
excessive smoking too .

by reading the topic ,what premix what ratio,you may learn a thing or two.
lots of guys are on 30to1
lots on 40to1 including myself.

and check for right spark offcourse :-D

freak

KXcam22:
WRX,
  By my opinion 30:1 is far too rich.  I never run any of my engines at less than 50:1.  Use a good synthetic oil such as Belray MC-1 (my favorite) H1-R or equivalent.  Post back with your exact jetting, plug and riding area conditions, temp elev etc. My feeling is that it is just too rich.  Lets fix that before we look and timing and other things.Cam.

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