Fly_mow Posted November 25, 2012 Share Posted November 25, 2012 My Ross 125 doesn't like ticking over when first started even once warm. I have raised the tick over a little bit, before I start tinkering any further I though I would ask if anybody has got any ideas. I don't use choke as its never needed it, I prime it. Start it with a bit of throttle. Then warm it up on my back but it keeps cutting out once it returns to idle until its been running for a while. Prob about 10 mins. Then it will idle fine. Is there a possibility it could be the oil blocking the idle jet until its desolved by the petrol flowing through the carb? All this makes getting airborne a pain in the arse as I start it on the deck then put it on then clip in and go. But it cuts out while I am putting it on!!! Thanks for reading peeps. Stu Quote Link to comment Share on other sites More sharing options...
spigot Posted November 25, 2012 Share Posted November 25, 2012 Hi Stu, What carb are you running? Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted November 25, 2012 Author Share Posted November 25, 2012 Walbro? Rings a bell but to be honest the motor has run sweet as a nut since i brought it so I haven't really looked at it. Just made sure it wasnt hanging off!!! I'll check and post it up. Sure I read walbro on it tho Quote Link to comment Share on other sites More sharing options...
spigot Posted November 25, 2012 Share Posted November 25, 2012 Possibly a WG8 ? If you need to start on part throttle it sounds like your low jet is blocked/restricted. And unless your using old cooking oil you wont have a problem with oil residue. Just usual build up of dirt and debris after time. Can be cleaned quite quickly with spray intake cleaner. Just don't forget to make a note of the low setting before removing the needle As for not using the choke? its a far more measured device for delivering a higher fuel/air ratio than squeezing a primer bubble and poking sticks at a thin rubber membrane Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted November 25, 2012 Author Share Posted November 25, 2012 Good point. I'll have a look. Thanks for your help. I will check the carb and post which one it is. Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted November 26, 2012 Author Share Posted November 26, 2012 I've tried posting some pics of the carb up but they are too big and not sure how to do it on I pad. It's definitely a walbro but not sure if there are different models. Sorry if this isn't much help. How can identify it more accurately? Thanks stu. Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted November 26, 2012 Author Share Posted November 26, 2012 Quote Link to comment Share on other sites More sharing options...
stuartasutherland Posted November 26, 2012 Share Posted November 26, 2012 Have you serviced the carb? You need to find the model number and order the service kit, usually under 10 quid. I did mine, was a bit worried about it but a good learning day! Search the web for a how to guide for your carb. It might just need the filter replaced ( which it tiny). Stu Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted November 26, 2012 Author Share Posted November 26, 2012 No I haven't. Like I say I haven't touched anything as it has run perfect for the last 8 months that I have owned it. I will have a good look over the carb when I get a chance and will get a kit ordered. Thanks stu, stu lol Quote Link to comment Share on other sites More sharing options...
stuartasutherland Posted November 28, 2012 Share Posted November 28, 2012 https://www.pegasusautoracing.com/docum ... =TECH00038 http://www.footflyer.com/fix/motor/carb ... walbro.htm http://sd2cx1.webring.org/l/rd?ring=2fl ... ion%2Ehtml http://larssletten.net/My%20stuff/walbr ... t-eng.html Some of the websites I used to help me service my carb. Hopefully you find something useful. Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted November 28, 2012 Author Share Posted November 28, 2012 Thanks Stuart. Will def have a look through. Going to have a good look at the carb the weekend as every daylight hour is spent at work at the min and apparently paramotors aren't allowed on the kitchen table. Can't see why. It's one of my 5 a day I thought? Quote Link to comment Share on other sites More sharing options...
alan_k Posted November 29, 2012 Share Posted November 29, 2012 Can't see why. It's one of my 5 a day I thought? Good one Quote Link to comment Share on other sites More sharing options...
Fly_mow Posted December 2, 2012 Author Share Posted December 2, 2012 I think I may have Sussed it. Before going all out I thought I would have a little play with the mixture screw. As I said when I posted originally I haven't touched anything on it since buying it, just made sure it wasn't hanging off, Any way once I had got it warm on my back I took it off. Left it on the floor and as expected it slowly died and wouldn't respond to throttle the cut out. Started it again which was a bit of an effort but eventually fired up. But this time I had a chance to wind the mixture screw in and out before it cut out. When I done this I got a noticeable increase in revs to the point the clutch started to bite. Obviously the cause of the problem as I sat and ticked over spot on till I hit the kill switch. The part that I what to know is, could the mixture be out due to the whether being that much colder , maybe the screw has moved through vibration? Just after some opinions. Thanks. Stu Quote Link to comment Share on other sites More sharing options...
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