Capotec2015

Hi, I took my motor out to test my "black oil from the ball/socket joint repair" which failed after about 15 mins (its a learning curve...new exhaust on order!) and I had someone film me going up and down this little area, motor on my back, no wing, away from civilization, just to observe general stuff when under some throttle power. Now I am not an absolute newbie -in that I have never had a lesson or never heard of the sport -but not many hours flying -did some free flying before...not much anyway what I saw in the video as I got more confident in accelerating was the top of the cage/frame turning to approx 11:30 position when I gave it some decent throttle and coming back to the 12 'oclock position as the revs died down. I understand that there are torque effects but wanted to know if this is normal or something is wrong or some adjustments need to be made -its an Apco SLT harness and a Ros 125 motor.. Any input welcome, Thanks

Cracking video...daft question -did you hire motors out there?

im going to start the engine today and see if it's fixed... left the compound on overnight but as kiwi says, a new exhaust will be the ultimate solution. Just out of curiosity is the ball socket idea a way of allowing some flexibility? I have seen on other non paramotor exhausts that this area can be prone to corrosion and breakage

OK -new angle on it. Its possible that the socket joint has been widened over the years and is no longer the snug fit it should be. Vibration etc. The oil may just be the natural by product of a 2 stroke engine but because the socket joint has been widened, the oil is getting out there. So, trying some gasket compound to see if that cures the leak.....

Just wanted to say thanks to all that responded -I'm kind of not sure whats going on but will keep going till I get the bugger sorted!! Cheers!!

From the ROS manual on the web it shows as 10.6 to 1. http://www.rosmotor.it/manual web.pdf Doing it hot may have taken it to the target figures.... So, all good for compression then and not the likely cause of black oil leak? Thanks Paul.

Cold engine...

Throttle held in and no throttle..results were the same...

First compression tester order got cancelled -second one arrived yesterday but I was away and couldnt do the test. Just tested it now. 5 pulls X 3 tests -topped out at 150 psi each time...

Just wanted to check something, does the throttle have to be held while doing the compression test? Thanks.

Compression tester ordered.. will research what its supposed to be and get back -and while Im at it I think I will become a paid member of paramotor club too ! Thanks Paul

Not done a compression test -will look into that this evening. Dont have a gauge -will look to buy one and see how I do that and what the compression should be on this engine. Thanks.

Hi Neilzy, Where the oil is leaking from isnt at the flat face where it joins the barrel -that joint is dry -its a joint which appears to be almost a ball and socket type thing a couple of centimeters from the barrel with retaining springs -no gasket -check the photos -would be interested in your opinion. Like I mentioned I made up a new mixture, new plug, cleaned the exhaust out using caustic soda bath -put it all back together and still getting black oil from the same place, dripping and going on to the prop. I am just going through a process of elimination -targeting the carb next...not sure whats causing it to be honest.. https://www.dropbox.com/s/sfn6ow8venorjf5/IMG_0580.JPG?dl=0 https://www.dropbox.com/s/v1yvpvjnsm6ga7y/IMG_0581.JPG?dl=0

Got the carb model (number was stamped underneath - Walbro WB 24) and have ordered a rebuild kit for it - another learning curve !!

Hi, Part of my troubleshooting to find out whats causing black oil leak where the ball socket joint joins the expansion chamber (not right at the barrel -thats completely dry) and getting on the on the prop-here's what I have done so far: Taken exhaust off and did a caustic soda bath for expansion chamber to clean out carbon and same for the joint that connects to the barrel. Re-assembled -new petrol mix at 125ml oil for 5Litres petrol -new spark plug. I have plenty of compression -so I am thinking it cant be the ring surely I would lose compression if it was the ring? I havent done anything with the carb -only check that the high/low screws were one turn out -which they appeared to be. Rather than buy the kit, I was thinking about getting a new carb -at least I can then rule that whole unit out... Does anyone know what model the carb would be? Also - is it possible that perhaps at some point a 2 ringed piston was installed and the oil ring is worn - or would that also manifest itself in less compression as well -or is that just unlikely. The original in the ROS catalogue show a single ring... Apologies for all the questions but I am on a learning curve with this! Thanks Paul

Nope. After caustic soda bath and degrease and reassembly, new spark plug correctly gapped, new petrol mix -high and low needles check for one full turn out - still getting oil leak... Thinking of replacing carb now - -

New Update - after more research, this could simply be carbon build up on the walls of the expansion chamber - and the exhaust needs cleaned out -either by hot torch - or caustic soda. I dont have a torch so going down the caustic soda route.....will let you know how I get on.... Thanks Paul

Just saw your other question - the oil is Castrol Power 1 2T Fully Synthetic...

HI Kiwi K -I think you're right... On the catalogue picture there is no gasket shown between part 98 and the main exhaust body. Looking at my actual one now I have taken it off, there is no evidence of one ever being there...the whole thing seemed to be able to swivel at that joint, which may be why its a ball and socket... So, trying to figure out whats going on with the leaking oil a. Part number 98 is worn somehow b. The exhaust connector opening is somehow stretched slightly c. The exhaust system is actually fine but something more internal is going on There is plenty of compression so piston rings seem to be ok from what I have read about the symptoms of bad rings - maybe its down to carburetor and mixture... Time to watch some carburetor videos.....

Update - --Took the exhaust off and I popped the springs off of the joint (part 98 in the catalogue link above)that is between the main exhaust body and the barrel/head - - and it literally fell out. You can see how black with oil it is here -https://www.dropbox.com/s/v1yvpvjnsm6ga7y/IMG_0581.JPG?dl=0 Does anyone know if it should be loose like that -are the springs there just in case it breaks and goes into the prop? So I dont know if: a.Its a worn part and needs replaced. b. Needs cleaned and high temp gasket sealant applied and re-fitted. Again, any advice welcome, Thanks Paul

HI -Thanks for responding. premix is 125ml to every 5L -I took that from the ROS motor user manual. Here is a link to the exploded view of the entire engine -https://www.dropbox.com/s/9q56h3d8osdh35b/ROS MOTOR CATALOGUE.pdf?dl=0 The leak appears to be coming from between part number 98 and the main body of the exhaust. I am wondering if something could be done to stem the oil or maybe part 98 needs to be purchased -not sure... I dont know how many hours the engine has done. It was a used engine when I got it. I have never flown it as I am just learning. It has probably done 2 hours total running time with me. It has tons of compression and starts relatively easily (using decomp valve) after a few pulls from cold and usually one pull from warm. Although you do need to give it a good pull - half assed pulls will simply not start this motor....that said, I have never not been able to start it. I am just getting used to having it on my back and now looking to see if I can fit a kick start to it as I am looking to be able to start it in the air -when I finally get there... I have some experience with 2 strokes as I used to work in forestry with chainsaws and rode 2 stroke bikes in my youth... Thanks Paul

Hi, I am looking for some advice please. I noticed little black streaks on the prop and can see seepage from the exhaust and also it appears to be coming from possibly the compression valve too. So, I had the inner O rings replaced and high temp gasket sealant applied -however, it looks like its coming from the joint before the exhaust meets the barrel. Is this a new exhaust situation or is there any other sealant that would cure this. If its a new exhaust then fair enough. Here's a link to a picture of it. https://www.dropbox.com/s/sfn6ow8venorjf5/IMG_0580.JPG?dl=0 We put some PTFE tape on the compression valve but I think the valve itself may be faulty as there is still a leak. I am going to buy a new one from the supplier in Italy... So, any advice welcome - thanks

I completely forgot about the foot start option - thanks for that! Looking into it now.

Hi. Firstly I am a beginner and havent yet flown this -my first ever - motor. I am getting familiar with the motor and know now that it will start from cold with a few pulls and once warm it should start on the next pull - however -even with the decompression button pushed in -its not a particularly easy start. I have been starting the motor on the ground as it needs a fast hard pull to get it going -but I had it going and knelt down to get into the harness and as I stood up with the engine on my back, it cut out. So I asked my mate who was there for safety and help (over 6 foot ex security guard), to pull start the engine and he couldnt do it - - but he wasnt putting enough 'snap' into the pull -not turning it over fast enough to get it started - and I am seriously doubting my ability to manually start the motor if it cut out, mid air when I am using one arm - plus the fact that I would need to get the decompression button back in to do so.. I am not so bothered whether it be electric or manual, I just want it to be physically easy to do and a button press seems like the easiest mode of operation, however I know there will need to be some engineering involved, which is where I am fortunate as near where I live there is a kind of club of experienced professional engineers that have offered help - but I was curious if anyone had any experience with anything like this....or alternative suggestions.. Thanks.

Hi -looking into the feasibility of adding electric starter motor to a ROS 125. Or can you have a flash starter? Any input welcome, thanks Paul.