mrdropper Posted February 22, 2010 Report Share Posted February 22, 2010 Hi all, I'm having trouble with the new 2010 290 ticking over. Any ideas on what jets I should be using. Thanks Paul Quote Link to comment Share on other sites More sharing options...
tricky dicky Posted February 22, 2010 Report Share Posted February 22, 2010 Which carb have you got on it? If you are on the standard Dellorto carb they come with spanish jetting on the pilot. The 30 that is standard needs changing for a 33 and it will run perfect. The mixture screw needs to be between 3.5 and 4.5 turns out, just find the sweet spot and you will be fine. I have noticed that with all this rubbish cold weather mine takes a while to warm up and settle to a nice tickover. Hope this helps Quote Link to comment Share on other sites More sharing options...
mrdropper Posted February 22, 2010 Author Report Share Posted February 22, 2010 Thanks for that, it is the standard carb. I will give that a try. Quote Link to comment Share on other sites More sharing options...
copemech Posted February 23, 2010 Report Share Posted February 23, 2010 Which carb have you got on it? If you are on the standard Dellorto carb they come with spanish jetting on the pilot. The 30 that is standard needs changing for a 33 and it will run perfect. The mixture screw needs to be between 3.5 and 4.5 turns out, just find the sweet spot and you will be fine. I have noticed that with all this rubbish cold weather mine takes a while to warm up and settle to a nice tickover. Hope this helps If you are having to run the screw out that far, you need somemore jet! Try the 35-36 range, I had to go to 38, which really helped eliminate ping in the off idle transition range below 1/8 throttle and smoothed things. Get your fuel screw down around 2 turn range for maximum control! You are not adjusting anything a 4 turns! Look at the tip of that needle! Quote Link to comment Share on other sites More sharing options...
tricky dicky Posted February 23, 2010 Report Share Posted February 23, 2010 On the Sherco settings list it clearly states to have a 33 pilot jet and the mixture screw to be 3.5 turns out so I am pretty sure that what they recommend is right rather than putting a 38 pilot in and not having the mixture screw out! Quote Link to comment Share on other sites More sharing options...
kramit Posted February 23, 2010 Report Share Posted February 23, 2010 A #38 sounds like a better bet than a #33. Your throttle response will improve and your range of adjustment, but like Cope says....somewhere in the middle might be right. Quote Link to comment Share on other sites More sharing options...
tricky dicky Posted February 23, 2010 Report Share Posted February 23, 2010 I am purely speaking from experience and it works well. Bear in mind that the original post is from the UK and the weather here is a long way different to the USA. I have never heard anybody in the UK using a 38 pilot jet. Quote Link to comment Share on other sites More sharing options...
robsmont Posted February 23, 2010 Report Share Posted February 23, 2010 would this be the same for the 250? Quote Link to comment Share on other sites More sharing options...
tricky dicky Posted February 23, 2010 Report Share Posted February 23, 2010 Yeah the same jetting for a 250. The bikes come with a 30 pilot in standard and it doesnt like Britsh weather so needs a 33 in and it will make it run lovely. Quote Link to comment Share on other sites More sharing options...
benz19 Posted February 23, 2010 Report Share Posted February 23, 2010 Yeah the same jetting for a 250. The bikes come with a 30 pilot in standard and it doesnt like Britsh weather so needs a 33 in and it will make it run lovely. How you finding your Sherco after all your Gasgas's??? Quote Link to comment Share on other sites More sharing options...
tricky dicky Posted February 23, 2010 Report Share Posted February 23, 2010 Its awesome Les, I reckon you would like it! You need to get yourself to some of the Earl Shilton training days then you can have a blast on it. Quote Link to comment Share on other sites More sharing options...
benz19 Posted February 23, 2010 Report Share Posted February 23, 2010 Its awesome Les, I reckon you would like it! You need to get yourself to some of the Earl Shilton training days then you can have a blast on it. I was thinking of that,ou did some work with my mate brenden,aussie guy and he was full of praise mate!!! I got me an 09 Scorpa SY250R.and have to say love it at the moment,different to the Gasser,has its good and bad points,luckily the good outways the bad :-) Quote Link to comment Share on other sites More sharing options...
mrdropper Posted February 23, 2010 Author Report Share Posted February 23, 2010 Thanks for all the coments. I put a 33 jet in and it seems better. Quote Link to comment Share on other sites More sharing options...
copemech Posted February 24, 2010 Report Share Posted February 24, 2010 I know it varies with the fuel and conditions, but if you cannot get your fuel screw down to the truely adjustable range of less than three turns, you are out of bounds and cheating your transition circuit as well which does nothing to smooth the bike. Add to it if you are getting the alcohol in your fuel! Pick your own poison! Quote Link to comment Share on other sites More sharing options...
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