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278
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1/8/2019
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SE
Fantasy
1969th
Hrzk75
7/21/2020 9:41am
7/21/2020 9:41am
Edited Date/Time
7/29/2020 12:36am
Hi, i tried to Google but could not find info on the standard jetting.
Does the 2015+ models have a different jetting from the earlier ones?
I installed the new airbox(15+) on my 2013 and it wont idle anymore so im just wondering if the new airbox have more airflow or something and need bigger jetts. I dont know Much about this since i have never needed to change anything before in a carb
Does the 2015+ models have a different jetting from the earlier ones?
I installed the new airbox(15+) on my 2013 and it wont idle anymore so im just wondering if the new airbox have more airflow or something and need bigger jetts. I dont know Much about this since i have never needed to change anything before in a carb
When i Tore down the top end i checked the spark plug and it was like burnt but white, no dark colours on it so i suppose it has run lean? Or does it not work to check sparkplug colour 2-3 hours past run time?
Its weird since it has run 13 hours without a problem with new piston, 40 hours since i bought it(122 total)
Anyway the main jet was 430 and pilot 40. Needle clip on 3rd, i have sent away the cylinder for a replacement but i wanna know why this happened, i lowered the clip 1 position and have ordered a 440 main and 42,5 pilot wich i Will try out. Is more then 3% oil mixture needed on a 125?
The piston took a beating and lost some of the material that holding circlip into place, have not found any trace of Either the broken piston parts or the circlip, how high chance is it that they have gone out into the Exhaust? Or is it Greater chance of the parts hiding under the crank?
Also found some chrome material has come off from the slide, not sure if that is new or if it has been there for some time, can it cause any troubles?
The Shop
what do you think about the slide? is it safe you use it more? and would you split the engine to look for the clip?
Paw Paw
If you plug was whitish and your jetting is typical and no trash got in the main jet to partially block it then you need to check for an air leak at the crank seals, head, or reed valve and intake boot. (Install a gas filter if it doesn't have one)
Make sure you have the mechanic check for up/down play at the big end bearing of the con rod so you'll know to replace that bearing if there is play.
Could the damage on the slide i posted a picture on make it running leaner? otherwise it wery well can be the crank seal
*edit* would not an air leak at the crank seal make the idle rise?
Keep in mind the offending metal might not be from a circlip. It could be a broken ring, ring pin, a reed screw, etc, etc.
Anyway engine is out and will be tore down, wont take the chance of the clip and everything else is out from crank area.
anyone know if a lean pilot yet could have done some damage or do they generally seize from too small main jett? the euro standard is a 45 pilot and i have a 40 in right now.
You can seize it from too small of a pilot, but usually that's accompanied by a long ride down a steep hill with the throttle chopped and the rpm's up high. Engine is at 8,000 rpm and only being fed by a circuit best equipped for idle-2,000 rpms for a long period of time.
Pit Row
Post a reply to: Yz 125 jet problem (now seized piston)