YS 61 LS
02-02-2013, 12:07 PM
#1
YS 61 LS
I have been racing with a Rossi .61 FIRE 3+2 with good success but feel the need to dial it up a bit. One of the issues with the Rossi has been fuel draw. It tends to go lean in the turns. I have tried to figure out how to incoperate a pump but there is just no room. In comes the YS. It has a built in pump and a reputation for good power. I found and obtained a used engine and at this point have torn it down and cleaned it. Looking at the internals I'm not sure it will be any more power then the Rossi unless I get to grinding. So at this point I'm looking towards you guys that have more experience at mods then what I have. I can do some basics and at this point my plan would be to raise the exhaust timing to 170 degrees, contour the intake ports and open up the crank a little. I have new chrome steel bearings on the way. So what would you guys do? My goal really would be to have it spin a 12X12 or 11X13 in the 13K range. Oh and it has to idle reliably at or less then 4K.
02-02-2013, 03:39 PM
#4
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RE: YS 61 LS
The best avenue for you is to find a Nelson/Performance Specialties piston and sleeve set, which won't be easy. Performance Specialties has no more.
They were made a few years ago by Henry Nelson and provided quite an upgrade. Timing was advanced for greater output. Ports were better aligned to the case transfer ducts. The materials and fitting was typical Nelson, with many people stating that they couldn't wear them out.
Good luck!
They were made a few years ago by Henry Nelson and provided quite an upgrade. Timing was advanced for greater output. Ports were better aligned to the case transfer ducts. The materials and fitting was typical Nelson, with many people stating that they couldn't wear them out.
Good luck!
02-02-2013, 04:30 PM
#5
RE: YS 61 LS
Thanks Ray, I was aware of the Shadel stuff as I used them in OS helicopter engines back in the day. I've done some searches for one and for the stock YS AR AAC setup. Even if I can find one I think that the added cost to what I already paid for the engine will just make it non cost effective. I was hoping that someone would be able to direct me in warmimg this one up a bit using the stock parts. The piston / liner are really in great shape with good pinch. I think I'm just going to go forward with an exhaust timing mod and some cleaning and see what I get. It may just end up going into my Dalotel.
02-02-2013, 09:56 PM
#7
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RE: YS 61 LS
The crank appears to be an 'AR' which has been further cut from the standard config. Maybe Dave Shadel might have a few piston/sleeve combos from when he made a bunch of custom sets for us here. It was mentioned awhile back that he had a few left over.
02-03-2013, 08:55 AM
#8
RE: YS 61 LS
Well looks like this thread may be for not. I ordered a few parts from SG engines yesterday morning, a thrust washer for my Rossi 61 3+2 and an exhaust adapter for this YS. Sahak at SG called me within 2 hours to verify the order because he realized that no Rossi engine was going to accept both the parts I had ordered. Once I clarified that they were for two seperate engines we got to talking. I told him I had been running Rossi's in my race planes but needed a little more out of the 61 and was looking into the YS. He offered his assitance to the point of consulting with the techs at the Rossi factory. Looks like I will be rebuilding the YS stock and then installing it into my Classic pattern Dalotel. Thanks to the guys who offered suggestions. Looks like I will be sticking with Rossi in the race planes.
