February 22, 201016 yr Hi all, I'm having trouble with the new 2010 290 ticking over. Any ideas on what jets I should be using. Thanks Paul
February 22, 201016 yr 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
February 23, 201016 yr 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!
February 23, 201016 yr 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!
February 23, 201016 yr 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.
February 23, 201016 yr 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.
February 23, 201016 yr 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.
February 23, 201016 yr 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???
February 23, 201016 yr 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.
February 23, 201016 yr 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 :-)
February 24, 201016 yr 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!
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