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New to the site, just traded for this rm last week and it wasn't together and missing pieces, so I got all my pieces and fluids, put everything together and found the carb float was out of adjustment and pouring fuel out of bottom overflow, so I set it to where when it's upside down it's level with bowl surface, no more fuel leaking. next I cleaned all my lines out and fuel tank, small particles here and there but nothing too abundant. got it to start and run with throttle, revs good but won't idle, so carb again. decided to fill radiator and found pin hole leaking out of fill side, so while I'm waiting on a radiator I'm trying to get the bike to idle. It has a fmf gold and power core 2, has a 55 stamped on pilot. carb is cleaned and holding fuel and running great, but still won't idle. I've got my idle turned to the 17th click, and mixture screwed out 1 1/2 turns. playing with idle and mixture screw doesn't affect the idle at all. I noticed a lot of slack in throttle cable, tightened it to remove slack, it tries to idle but dies after about three seconds.

I've had a yz85 and cr125 along with an xr100 and kx450f, I've been around and rebuilt many bike engines, but I have always had issues with carbs, I even went to a skills class for small engines for two years in high school and it still eluded me then as it does now to get carbs to work right. If anyone can help that'd be greatly appreciated, as I have tried my tricks to get it to idle. The throttle cable was way too loose, so now that it's set it might affect the idle, but even with throttle completely shut it should still idle right? Only thing I can think of is to set the throttle to just barely open to get it to idle, it smokes a bit as I'm running 36:1 as per another thread I had read earlier this weekend to set it between 32:1 and 40:1 as a precaution until i can get it idle I'll start mixing different ratios for the ideal mix

Thanks in advance

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55 pilot is to rich

45 pilot is what you want

is the needle the standard n3wk ?

what is the main jet

what temps and elevation do you ride at

what premix oil do you run

dont be scared to go 40:1-50:1 with good full synthetic oil

 

 

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No idea on needle, or main jet, I'm assuming not stock
Literally just got the bike and started messing with it yesterday,
It's 70 today and idk elevation, I'm in Indiana
And super m
I think 36:1 is a little much, it's throwing oil out of the exhaust

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On 22/05/2017 at 9:10 AM, Silverscottsk10 said:

No idea on needle, or main jet, I'm assuming not stock
Literally just got the bike and started messing with it yesterday,
It's 70 today and idk elevation, I'm in Indiana
And super m
I think 36:1 is a little much, it's throwing oil out of the exhaust

If it is spitting oil it is jetted to rich , even at 16:1 you can jet to run clean , but flash point of the oil also makes a difference 

indiana appears to be 1200-1300ft 

jetting  specs :

45 pilot

nedj needle clip 2 60f and above

necj needle clip 3 below 60f

main 162 ( standard ) maybe 160 would work

google spanky's jetting guide for correct airscrew adjustment and plug chops to test the main for rich or lean 

40:1 premix ratio

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If it is spitting oil it is jetted to rich , even at 16:1 you can jet to run clean , but flash point of the oil also makes a difference 
indiana appears to be 1200-1300ft 
jetting  specs :
45 pilot
nedj needle clip 2 60f and above
necj needle clip 3 below 60f
main 162 ( standard ) maybe 160 would work
google spanky's jetting guide for correct airscrew adjustment and plug chops to test the main for rich or lean 
40:1 premix ratio

Where can I find jets at? I was gonna rebuild carb but they never specify the jetting of them
Although I've rebuilt many bikes I've never had anything past stock, so jetting is new to me

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parts dealer or online

www.partzilla.com on your side of the world has them

I will post part numbers for the needles  

the 45 pilot and main is a generic part for any pwk keihin carb

Edited by kxrob

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Got some new radiators from fleabay
And my parts arrived that I've been needing
Also got a carb rebuild kit
The main is a 162 and pilot is a 48
The main in the carb is a 160 and pilot is a 55
Should I leave the main in the carb and swap out the pilot?
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2 hours ago, Silverscottsk10 said:

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Still a little rich but it runs pretty good

Switch out the pilot for a 45 . Trust me on that one 

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Switch out the pilot for a 45 . Trust me on that one 

Its running pretty good on the 48, better than 55
I already spent 20$ on the kit, I will be rebuilding this sometime this winter

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14 hours ago, Silverscottsk10 said:


Its running pretty good on the 48, better than 55
I already spent 20$ on the kit, I will be rebuilding this sometime this winter

cool ,

48 should get the job done , just may need to use more air screw to dial it in

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Well bike is back to not running right, idles alright, revs fine, but soon as you put it in gear it has no mid range, like it's being flooded out
Once in full throttle it comes out of it and is fine until shifting to the next gear, could it be carb? Power valve adjustment? It's stumping me with it doing it under load only

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