Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
Purpletj:
--- Quote from: Friar-Tuck on March 20, 2010, 05:19:33 AM ---P.J.
If there is not a bike shop in the area ( Like Myself) there are severl other options.
Most other motosport, Service Honda etc will sell individual jets.
I would recommend making sure the jets are actually Keihin. (drunken star stamp)
I have had several bikes over and although the jets were the correct dimensions externally, the flow rates were questionable. I had a crf80 one of the kids friends re-jetted and appeared to have done everything to get his kids bike to run properly. It would start and idle great but at half throttle it wouls stumble, and die if you tried to open it up. The culprit was an off brand main. I had a keihin, put it in and we got it to scream.
This may have been an isolated incident, but someone else may be able to verify the same type story...
Tuck\o/
http://www.carbparts.com/
http://www.jetsrus.com/
http://www.motorcyclecarbs.com/index.cfm
http://www.factorypro.com/products/Jets,%20Keihin,%20buy.htm
--- End quote ---
I understand I can buy the kleihin at any local shop. I was just trying to avoid the higher cost. Sudco has some really good pricing. If you know what i mean.,
Purpletj:
The cheapest I have found at my local place is around $6.50 BTW.
HammeredFlat4:
I just checked my jetting while going through my bike, I have a 172 main and a 50 pilot. :? I am going to order some more jets tomorrow, I think I will start with 168/55. 99 K5, engine is stock as far as I know besides the crank being balanced, FMF Gnarly with FMF Turbine Core, 40:1 castor 927 and 91 octane.
fatboy2k500:
Just pulled my carb apart on the 500 for the first time to do a little cleaning before heading to Oceano dunes (pacific coast in CA) tomorrow morning. It did have a 168 Main in it, but had swapped to a 172 to try to get it to stop pinging in mid-range on 91 octane (now running 110 leaded and problem is gone). Pulled the 172 out and exchanged for a 165 and yanked the pilot (which as 58) and replaced with a 55. Trying to get some of the blubber out of this thing by leaning a bit (until I get some surging then coming back). It's got a Zip Ty pipe and silencer on it, RAD valve (which I'm seriously thinking aout replacing). Runs okay but doesn't feel like a 500.
I was thinking of getting a couple steps in either direction (from stock) to play with but don't want to spend all weekend long jacking with jets in the sand if I don't have to. What do you think of 165/55 on 110L fuel with current mods?
Jopiz:
My bike is not a 500, but didnt bother making a new topic to the 125/250 side. So i borrow this one.
My bike runs nice at 3/4 throttle. I did a plug test and it was perfectly tan (@ 3/4) . When i open my throttle to max, it feels like the bike stalls. Aren't main jet and needle taper only responsible for 3/4-1 throttle openings? This claims ( http://www.nsr-world.com/tuning/250-tuning/carburation%20index/jetting/images/jet-chart.gif ) that needle position makes no difference at 3/4-1 position.
Main jet is stock, Pro circuit and Boyesen recommends the stock main jet.
Im too afraid to do a wot run and then do a plug test.
Am i too lean or what?
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