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GuyWithABike
2/25/2019 10:12am
2/25/2019 10:12am
Edited Date/Time
5/14/2020 12:01pm
Any suggestions on 2018 KTM 50 SX jetting? I'm running factory settings. Son is zero to half throttle at most. I'm thinking of dropping needle by one and then adjusting air screw.
i would go ahead and pull the pipe off repack he silencer and clean the exhaust ports or power valve ,
i would run a lower flash point oil.
flash points of oil
motorex cross power2-230
what i would run
maxima bio 2t-180
motul 710-190
amsoil dominator-194
bell ray si7-194
The Shop
if there is excess oil on the head pipe then all the oil is not buring.
but ktm recommends that oil for racing wide open, he has stated that his kids only rides up to 1/2 throttle, with that mutch oil it seems to be a jetting issue and not burning all the oil off if he pulls the pipe off there will be a large amount of oil in there same with packing.
with that amount of oil it looks like more than jetting the motor is not getting hot enough to burn all the oil.
yes the jetting should be adjusted but an oil switch to a lower flash point would help.
just trying to help a guy out and you just want to come in and call me out about how i know nothing.
I have looked over many studies and have had friends help me look into some oils who have chemical engineering degrees.
This is like woods racing with castor 927 at 32 to 1 you get a lot of excess oil, we all know that the same applies here, yes his jetting may be off but all that oil is not just a jetting problem, all the oil is not being burned, there for moving to a lower burn/ flash point oil will allow the oil to burn cleaner and burn all the oil and gas.
it is also common to know that lower flash point oils are for woods riding and less aggressive riding so all oil is burned.
it would not hurt to clean everything up then try a different pre-mix then if that does not work jetting.
Also motorex sponsors ktm and gives them free oil so why would you not say to run that in all ktms.Thats like being sponsored by monster and not recommending them.
i like to look at independent information so that there is bias to go on.
This shows you how your jets work in relation to throttle.
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