fuzzybabybunny Posted November 2, 2015 Share Posted November 2, 2015 I'm debating getting a Backbone Stronger 125. It uses the ROS 125 or the ROS Lighter 125 engine. People on here have said that these engines aren't very reliable - what tends to break and how easy is it to fix? Locals where I'm at use a couple of Backbone Strongers. They haven't had any real issues other than replacing a spark plug, which seems pretty routine to me... Quote Link to comment Share on other sites More sharing options...
Capotec2015 Posted November 5, 2015 Share Posted November 5, 2015 Hi - Just some info really.. I have recently acquired a Ros 125 -a newbie to the sport myself and recently had the manual pull start spring go on it - got it fixed easily enough though - but whilst looking for parts, I found 2 suppliers - PAPTEAM in Italy and Kangook in Australia, who both deal in original ROS parts....(couldnt see anyone in the UK that stocked the parts) So, I emailed Ron at Kangook about the ROS motors general characteristics, what it was like etc - explained that I am new to the sport - here was his reply Hi Paul, The Ros 125 is a good motor. I have personally chosen to fly the Ros for the last 4 years. Good motor, and easy to work on. I was quite heartened by that response...although at the end of the day it is still a 2 stroke motor and something will go wrong at some point... Quote Link to comment Share on other sites More sharing options...
Guest Posted November 5, 2015 Share Posted November 5, 2015 It's also worth saying that 'starter mechanism' issues are not unique to this engine. SW Quote Link to comment Share on other sites More sharing options...
Capotec2015 Posted November 5, 2015 Share Posted November 5, 2015 Absolutely - I used to work in forestry years ago and our chainsaws had the same starter mechanism design and they would break from time to time - not often though..so I wouldnt have though that you would have had to pay particular attention to it as a weak point on the Ros... Which leads me to the pulley (over the shoulder starting for in flight restarts) Right now, I dont have the pulley in use, so the starter cord retracts fully to the casing, down the back of the frame, which would be unreachable in flight. So, I am going to get the pulley put onto a piece of stainless, screwed to the frame.. For anyone who uses this method - how hard is it to restart the engine, pulling over the shoulder? Is there a technique - a knack?? thanks Paul Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted November 5, 2015 Share Posted November 5, 2015 Friend of mine had a pap ros , only issue he had was the amount of compression his one had , it didn't have a decomp button If you didn't get it right it would kick back hard dam near pull your fingers off . But it did run nice . Cas Quote Link to comment Share on other sites More sharing options...
notch Posted November 15, 2015 Share Posted November 15, 2015 http://www.papteam.com/noticias_ing.php ... oticia=146 Quote Link to comment Share on other sites More sharing options...
fuzzybabybunny Posted November 27, 2015 Author Share Posted November 27, 2015 http://www.papteam.com/noticias_ing.php?seccion=5&vernoticia=146 Right. This worries me. So getting the ROS 125 engine would mean having an incredibly hard time servicing the engine should I need replacement parts? Quote Link to comment Share on other sites More sharing options...
simonmarshall Posted December 23, 2015 Share Posted December 23, 2015 You can get parts for the ROS 125 easily direct from the manufacture: http://www.rosmotor.it/home.html email: g.marcolini@marcmotor.com I've found them very helpful, and they provide a good service. I've had a ROS 125 for a few years now, and am happy with it, the things that I've had to replace are: - Exhaust (snapped at weld points); - Piston and cylinder (locating pin on the piston came out and scratched the cylinder); - With the old exhaust the springs broke a few times (all fine with the new one though); and - One of the reduction cogs snapped in two. Quote Link to comment Share on other sites More sharing options...
Ian bowie Posted March 22, 2023 Share Posted March 22, 2023 Hi, does anybody know if there is a recoil pull start that fits the Ros 125. I am hoping that with one I'll be able to start it easier when I'm wearing it. cheers Ian Quote Link to comment Share on other sites More sharing options...
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