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darkhero · 06-20-2015, 05:59 PM

YS120SRX is about 5.5mm higher that YS120SR as you can see at foto. Only two different parts at SRX version - Crankcase and Cylinder Head. All other parts the same.

RontaryUS · 06-20-2015, 09:28 PM

The cranckshaft is also different and weighted to decrease vibrations as compared to the original 120SR.

Commodore8888 · 06-20-2015, 10:04 PM

Crankcase, crank, head. That's it on the SRX version. Really more of a revision to fix heat and vibe issues.

Rob43 · 06-21-2015, 08:28 AM

I've heard it's much better tuniung than the 120SR as well. How would that be? Differences in sleeve porting...?

Commodore8888 · 06-23-2015, 11:53 PM

I can't say as I've never personally tuned a 120SR. I can tell you that the SRX is fairly easy to get dialed in as far as YS engines go.

The much improved cooling would certainly affect trying to hold a solid tune. I've been repeatedly told the 120SR had issues there, but again I've never had one personally so I don't feel qualified to give you a solid opinion there

The 120SR and SRX both use the same sleeve part from YS last I checked.

RontaryUS · 06-24-2015, 08:23 AM

Once you get used to the YS120SR, tuning is not am issue anymore. I am running two of those, and from a day to another it may be a few clicks adjustment. It took me several gallons to understand that engine though.

Vibes remain high but acceptable when tuned OK.

06-20-2015, 05:59 PM	#1 (permalink)
darkhero Registered Users Join Date: Jul 2008	YS120SRX vs YS120SR - fotos! YS120SRX is about 5.5mm higher that YS120SR as you can see at foto. Only two different parts at SRX version - Crankcase and Cylinder Head. All other parts the same. Attached Thumbnails

06-20-2015, 10:04 PM	#3 (permalink)
Commodore8888 Registered Users My HF Map location Join Date: Apr 2011	Crankcase, crank, head. That's it on the SRX version. Really more of a revision to fix heat and vibe issues. __________________ "You need more rockets. Everything is better with rockets" Mike Dipalo--Synergy RC, MKS Electronics

06-21-2015, 08:28 AM	#4 (permalink)
Rob43 Registered Users Join Date: Oct 2008 Location: Midland, Michigan	I've heard it's much better tuniung than the 120SR as well. How would that be? Differences in sleeve porting...? __________________ = Rb43 =

06-23-2015, 11:53 PM	#5 (permalink)
Commodore8888 Registered Users My HF Map location Join Date: Apr 2011	I can't say as I've never personally tuned a 120SR. I can tell you that the SRX is fairly easy to get dialed in as far as YS engines go. The much improved cooling would certainly affect trying to hold a solid tune. I've been repeatedly told the 120SR had issues there, but again I've never had one personally so I don't feel qualified to give you a solid opinion there The 120SR and SRX both use the same sleeve part from YS last I checked. __________________ "You need more rockets. Everything is better with rockets" Mike Dipalo--Synergy RC, MKS Electronics

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06-20-2015, 09:28 PM	#2 (permalink)
RontaryUS Registered Users Join Date: Jan 2013	The cranckshaft is also different and weighted to decrease vibrations as compared to the original 120SR.

06-24-2015, 08:23 AM	#6 (permalink)
RontaryUS Registered Users Join Date: Jan 2013	Once you get used to the YS120SR, tuning is not am issue anymore. I am running two of those, and from a day to another it may be a few clicks adjustment. It took me several gallons to understand that engine though. Vibes remain high but acceptable when tuned OK.

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