Hi guys

I'v just picked up the above bike and the jets are:-

Main - 122

Pilot - 35

Needle - D36 on bottom clip of 4

I'm in the UK so looking to make sure the bike is good to ride all winter without chopping and changing too much. How do these look?

There's a lot of spooge in the pipe so thinking it may be too rich for summer but may be ok once it starts getting colder?

Cheers

Andy

Edited November 1, 201411 yr by andilicious

Yea, well it all varies a bit with the bike and carb but sounds close enough. I generally suggest 35-36 range on the pilot and 118-120 on the main. I think you can move the slide needle clip up one notch to lower it a bit.

Mix screw will likely take 3 turns out give or take on the day still.

FWIW, Cheers

Cheers Cope.

It feels fine now I have sorted a few things out.

The pilot jet wasn't screwed in properly and the vents had been looped together so they weren't venting! I have seen this a few times on trials bikes!!

I dumped the original fuel out which was yellowish and I think mixed at 50:1. I'm running it at 80:1.

Feels so much better on the throttle now after these few adjustments. I think I will leave the needle position for now and see how it runs.

Going to have a play on it for the day today and go from there really.

I think it will need shock and forks servicing and setting up correctly but thats another topic entirely...

When you say the vents were looped together was there a section of the hose sliced off the bottom, that is how the dellorto carbs are standard

I would have said that the needle sounds like it would be set a bit rich, normally the clip will be in 1 of the middle positions

Hi Tony,

No the previous owner must have though the sliced out bit was it wearing through so had put a brand new piece of hose in there!!

I am thinking the richest clip position will be slightly rich now but will be fine for the next few months as it gets colder.

I am just going to treat it to a new spark plug so while the tank is off I'm going to change it to clip 2 for now and see how she runs.

I have noticed that the float valve into the carb is passing slightly and if I leave the petcock on overnight, the fuel overflows out the carb and makes its way into the cylinder.

I have to give it a good 90 - 100 kicks to get it to start after that!!

Question is, on the splatshop 'preparing your Sherco for UK' page it suggest that the float valve should be increased from a 200 up to a 250. Is this relevant to an '06 model 290 as well as the '10-'11 the page refers to?

If I'm buying a new float valve I may as well upgrade it while I'm at it for no extra cost!

Cheers,

Andy

Check the number stamped on it but changing to a larger size shouldn't affect the jetting as it really only allows fuel to enter the float chamber faster to prevent fuel starvation at sustained high revs & the float valve will still work like normal just quicker if that makes sense

Likely a 250 init. There was a change on the "10 I think due to the pump fed system flows different I suppose.

Seems too much inrush of fuel when the thing opens is not desirable as it makes the level less stable which effects mixture.

I will take a look this weekend when I get home. At the moment I'm just remembering to turn the fuel tap off overnight and that solves the problem for now!