mjmac Posted October 22, 2016 Share Posted October 22, 2016 Hi everyone, i have a PAP ROS 125 and I need some help setting the jets on a Walbro WG-8 carburettor? Could anybody tell me how much the jets should be opened from fully closed? Thanks, Marcus Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted October 22, 2016 Share Posted October 22, 2016 Starting point would be low jet 1 1/4. From closed ,. Hi jet 1 1/2 from closed . It would help if you are familiar with doing this as this is a starting point. Have you had the carb apart for some reason . cas . Quote Link to comment Share on other sites More sharing options...
Dariuszk24 Posted October 22, 2016 Share Posted October 22, 2016 walbro wg8 dont have hi jet,only low jet with have to be open min 3/4 turn second screw opening throttle plate Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted October 22, 2016 Share Posted October 22, 2016 My one has both. His post says jets not jet" cas . Quote Link to comment Share on other sites More sharing options...
mjmac Posted October 23, 2016 Author Share Posted October 23, 2016 Hi thanks for information - I have had the carb apart for general servicing i.e. Gaskets etc. It seems to be running well - I have the high jet open about 1 1/4 turns and the same for the other jet / throttle plate - it does however seem to when I have started the engine and apply throttle it cuts out sometimes is this maybe because the mixture is too lean and I need to open the high jet slightly? Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted October 23, 2016 Share Posted October 23, 2016 Generally yes open hi needle till lean/flat spot is gone . I normally work both jets will setting my carb after a rebuild. (Walbro) you haven't mentioned pop off pressure test after your rebuild ' your at a point were you could wreck your motor while holding full power just after your feet leave the ground , your gonna give it a go no matter what . So if you get rid of flat spot by opening the hi jet ' open a bit more say 1/8. Or 5mins as on clock face" should get your self a pop test gauge if your going to Dick around with your carb ? Cas . Every one will have there own version of the above . Including plug chop/. Colour check . Quote Link to comment Share on other sites More sharing options...
mjmac Posted October 23, 2016 Author Share Posted October 23, 2016 Hi hanks for the reply, yes I must get a pop off pressure tester for my engine as I most definitely do not want to wreck my engine. Do you have any recommendation as to where I could get a tester? Quote Link to comment Share on other sites More sharing options...
kiwi k Posted October 23, 2016 Share Posted October 23, 2016 Carburettor pop tester's about £30 on ebay. Quote Link to comment Share on other sites More sharing options...
cas_whitmore Posted October 23, 2016 Share Posted October 23, 2016 Money well spent , cheaper than a seizure ? Cas . Quote Link to comment Share on other sites More sharing options...
kiwi k Posted October 23, 2016 Share Posted October 23, 2016 59 minutes ago, cas_whitmore said: Money well spent , cheaper than a seizure ? Cas . Only if you keep pulling them to bits , but yes i agree money well spent Quote Link to comment Share on other sites More sharing options...
mjmac Posted October 23, 2016 Author Share Posted October 23, 2016 Agreed! Quote Link to comment Share on other sites More sharing options...
admin (Simon W) Posted October 23, 2016 Share Posted October 23, 2016 58 minutes ago, kiwi k said: Only if you keep pulling them to bits , but yes i agree money well spent I have to admit, I am not a tinker type of guy. I don't know if it's just luck or actually the fact that I just leave things alone, but I have never had to adjust a carb on a machine that I have not touched with a spanner (if that makes sense lol) Both the Schools Parajet 80LC with the WB carb and 185 Moster are now well into 40+ hours after this season and I have not had the spark plug out of either of them. The first carb that came with the 80lc ended up bonk, fast! but as soon as the WB was fitted 30+ hours ago, It has not been so much as touched. I guess I am happy to hear the occasional 4 stroking, I guess I am not massively bothered about how much petrol it uses, I know its not an F1 car or a fighter jet, Its a 2 stroke engine and I am just happy with a few niggles I suppose. I should back this up: We have had a school for 12 years now, our first machine snapped its crank at very close to 800 hours!!! guess what??? new crank and bingo still no carb messing and job back on. That Paramotor still exists and it flying today (Parajet Compact Titanium with Parajet 180 engine) We have never had a school machine cook on us (apart from when I forgot the oil ) My message... If it ain't broke.... DON'T FIX IT. aimed at no one in particular, this ended up longer than I was expecting lolol (I blame wine o-clock!) SW 1 Quote Link to comment Share on other sites More sharing options...
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