Maintenance & Technical > KX500 Original
bike just doesnt seem right.
DoldGuy:
--- Quote from: kelcrist on April 17, 2011, 03:42:03 PM ---howdy folks.
heres the situation im facing. i have a 92 that i have done a top end job on. i had the cylinder re-plated and used a wiseco piston. since then the bike just doesnt seem to run right. at first it had unstoppable low end power but no top end rev. i discovered that i had the power valves timed wrong so that cured that issue. it will now rev and still has decent low end but it actually sounds like it misses at low rpm. i have a 94 that runs completely different. i would consider it "normal" since my brothers 95 and my friends 97 all seem to run about the same. the timing is set at stock on all the bikes mentioned and the jetting is all similiar, within a size or 2. pipes differ a little, one stock, one fmf desert and one fmf woods. all in all none the bikes are mostly stock so im wondering what can make such a difference? any thoughts at all??
oh and i have not done any leak down or any tests like that.
--- End quote ---
Who did you have do the plating on the cylinder?
DoldGuy
oic0:
Missing on the low end huh? What about jetting and plug? Maybe the plug got bumped and messed up the gap (or fouled). The bike with the woods pipe will have more bottom end than the others though and maybe run a bit cleaner down low. I know my bike sounds like its running pretty clean but then when it comes on the pipe, the whole pitch changes and it runs cleaner than an EFI bike (top end pipe).
Also what about the reeds?
Is it hard to start?
Also, check the kips without touching the top end. Just take the pipe off and look in there with a flash light. Pull the little arm and watch it operate. That lets you see if the cylinder parts are doing their job. Then you can rev it with the cover off to see if the actuator is doing its job.
kelcrist:
i believe millenium did the plating.........
as for the kips actuator it is fine, never had a prob. always where it belongs.
i have jetted it up and down based on the jetting of my other 500 and the other 500s i have access to. however.........it has been blowing a lot more oil out of the exhaust lately so i removed a 162 main and put in a 155. i am at 2800ft by the way....... i would like a 158 but i will have to go buy one. i have run a couple different plugs at variousl times..........going back and forth between the 9es and the 8es..........it seems to prefer the 9. the reeds are brand new boyesen. it is never hard to start. 2 or 3 kicks.
i have done the visual check of the powervalve that is how i found out it wasnt opening the secondary ports. i think i may have put it too far the other way. it seems to do what its supposed to when you do it by hand but not sure whats happening when the engine is running.
so far im thinking its a combination of jetting and powervalve. the weather here hasnt been great but its clearing up so ill probably be out messing with stuff this weekend. i also have a rad valve and a 10mm spacer to try. the rad valve didnt seem to make a huge difference on my 94 and that bike runs like its supposed to in my opinion.
thanks for all the input so far from everyone.
Motorrad:
New rings and plate doesn't mean anything... Comp test it..
AND leakdown
What's the ohm specs on coil and stator?
alward25:
A 155 main sounds way too small even for 2800 ft. What are you using for premix?? Fuel?? Have you checked your reeds? If your are getting stuff out the tailpipe is it black or is it real runny? I blew a head gasket and it had quite a bit of brown runny stuff coming out the tailpipe. Head gaskets are cheap. Do a test like Motorrad said.
You had nothing better to do this week anyway right :wink:
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