Tuning of a YS63 (new model)
12-29-2004 | 10:13 PM
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From: Flower Mound,
Tuning of a YS63 (new model)
I have read through the various posts on this site about tuning YS engines. I have a brand new YS63S. I am running some left over helicopter 15% power master fuel with a 11X8 APC prop. I am using an OS F-type plug. I have a couple of questions:
1) All the references to needle settings are begin with the high at 2 turns from closed and adjust and then the low at 1 to 1.5 turns from closed and adjust. For the low end, is this number in reference to fully screwed in (ie. fully rich)?
2) I set the high end (1.90 turns from closed). However, as I was trying to set my low end, I noticed the high end began to have problems where the engine cuts out at the high end (3/4 throttle). It didn't sound like it leaned out but I richened it. This only made it quit earlier. I am advancing the throttle slowly, so I am not sure what this could be. Is it too rich. The engine is new and only has about 3 tanks through it so I am cautious about leaning it out too much.
3) Finally, initially when I did have it running ok, (high end at approx. 11k rpm), when I would cut back the idle would come down to 2400 - 2600. I have read that it needs to be around 2000 for the air bleed system to really work. Is this true? If so, how do I adjust it? I tried the low end needle but this didn't seem to help.
Thank you so much for your help.
Happy new year!
Sincerely,
Jeff
1) All the references to needle settings are begin with the high at 2 turns from closed and adjust and then the low at 1 to 1.5 turns from closed and adjust. For the low end, is this number in reference to fully screwed in (ie. fully rich)?
2) I set the high end (1.90 turns from closed). However, as I was trying to set my low end, I noticed the high end began to have problems where the engine cuts out at the high end (3/4 throttle). It didn't sound like it leaned out but I richened it. This only made it quit earlier. I am advancing the throttle slowly, so I am not sure what this could be. Is it too rich. The engine is new and only has about 3 tanks through it so I am cautious about leaning it out too much.
3) Finally, initially when I did have it running ok, (high end at approx. 11k rpm), when I would cut back the idle would come down to 2400 - 2600. I have read that it needs to be around 2000 for the air bleed system to really work. Is this true? If so, how do I adjust it? I tried the low end needle but this didn't seem to help.
Thank you so much for your help.
Happy new year!
Sincerely,
Jeff
12-30-2004 | 11:29 AM
#2
Senior Member
RE: Tuning of a YS63 (new model)
Go to www.ysperformance.com and read the running instructions. Your high speed needle is way too rich, and the fuel you are using is compounding the adjustment problems.
After the engine is well broken in, IT MIGHT idle at 2000, but only with fuel containing more nitro. I usually shoot for 2200 to 2400 for a good idle with the 63's.
Good Flying!
After the engine is well broken in, IT MIGHT idle at 2000, but only with fuel containing more nitro. I usually shoot for 2200 to 2400 for a good idle with the 63's.
Good Flying!
