Maintenance & Technical > KX500 Original
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hughes:
Have you checked the float height :?: :?: You said dropped -2mm. What was total float height? Float height is 27mm from top of float to carb body mating surface. With the carb flipped upside down measure from the top of the float to the area where the carb bowl would mate to the carb body. I used a depth gauge. I disagree with hoopy on the black spooge due to oil/gas mix(with my bike). I had a major problem with spooge leaking out at the pipe and silencer. I tried 40:1 and 50:1 no change in spooge. Float height was off by 6mm and rejetted the pilot and set the air mix screw. You are going have a hard time jetting your bike if the float height is off. I run 32:1 using Yamaha's 2R(best oil on the market). Scent changes I have ran 5-6 trail rides with no spooge leaking. The trails I ride you can only use 1,2 gear they may be one area where you can hit 3rd. What gearing are you running :?: Reason I ask is I switch to 14/49 and it made a big differance when hitting the slower trails. The engine stay rev'ed up more. I may switch to 14/50 or 51 this winter.
barryadam:
I just reduced float height before second last ride. It was even with bottom of carb body, now at -2.0 mm. I think that helped a lot, as it doesn't seem as messy, but plug looked about the same.
I ride mostly in 2nd, but last ride was WFO (or as much as I could brave) on straight paved roads, so it really blew out any cr@p.
The biggest mess I've got is some speckles on the back fender and back of my jersey. The exhaust tip looks a bit wet and coked, but hopefully the new float height, new oil (Y2R), new ratio, and other changes will help.
I might try to pick up a new rear sproket with some more teeth and throw that on if I plan another ride in the lower gears. Boy, I relly appreciate the tractor pulling torque of the KX500 in the low RPM range when on a tough uphill or tight spot. First gear does seem a bit tall at times especially on tight downhills.
Thanks for your help. I'll be changing jetting this weekend.
hughes:
Try to measure from the top of the float to the carb body and see how close you are to 27mm. I had the same thing black oily spots on the back of my jersey.
KXcam22:
Some spooge is oil brand related as well. Being a belray MC1 fan, I tried their H1-R for a summer since it was a "power valve" formula. At 60:1 I got so much spooge I couldn't handle it and went back to my faithful MC-1. The MC-1 is nice with only a touch of spooge. I'm going to play with some needles next spring to tune it more exact (also gives me something to play with). I run 14/49. Just the one tooth larger made a huge diff. more than you would expect. The 49 rear lets you use 1st to 3rd gears in the tight. I may try a 50 next sprocket but won't go lower. Cam.
hughes:
My jetting is not perfect but I would half to say the gearing made a big diff. The engine is staying rev'ed more and it's not lugging through the woods. With the stock 14/47 the engine would load up a little more and I was lugging it. I ride in the woods not track.
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