Maintenance & Technical > KX500 Original

what jetting are you guys that ride dumont using?

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Motorrad:

--- Quote from: bennieben on January 25, 2010, 04:48:13 PM ---you know what, i think you guys are right. there is not much cooling storming up a long steep sand hill and then just coasting down, and then doing it again and again. i think that i will go one step bigger than the stock main jet and use the 110 from now on too. what do you guys think, maybe a 170?

--- End quote ---
I've seen several bikes stick due to "coasting" down the hill improperly.   
(letting motor slow you down).  If you were doing this. It could be the reason for all that heat.    Little lubrication (throttle shut off). (lots of rpm from motor braking)

Friar-Tuck:
Motorrad makes another good point,
  engine braking on a two stroke for extended periods of time is not the same as engine braking 4 stroke.
     I remember reading that it was not all that uncommon to hold the kill button in every now and again for guys running desert/dry lakes, does that sound feasable for rolling back down the dunes to the line up area? :?
  Is there any other suggestions from guys who regularly run the Sand Dunes?
  Tuck\o/

Hillclimb#42:
Its just a matter of pulling the clutch in and giving it gas a few times. "Ying Ying". A long engine braking session on a two stroke is leaning it out with the rpm's high. I use minimal engine braking. I ride a sand park here and for the most part, you don't need brakes to go down a hill, or engine braking. Any aggressive braking ,on sand, leads to front tire washing and then a tank slapper.
  Too freakin' cold here to ride anything without a heater. In the teens today. You California guys got it made. I probably have til March before slinging any roost. :x

bennieben:
i coasted down the hill in fourth sometimes fifth gear. i dont use the engine for braking. my coasting down is pretty fast. i think its just an issue of the jetting being too lean, and my poor bike lugging around a rhinocerous such as i. haha.

USMC 500:
stupid question but here goes........did you make sure that you topped off your coolant AND purged out all the air........air bubbles in certain areas of the system could cause this problem couldn't it? :?

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