Jump to content

Stock Jet Size For A '15 Sherco 300


fxstbi
 Share

Recommended Posts

I just bought a like new '15 300 that the original owner said has never been touched. It has felt and sounded lean since I've had it so I pulled the carb and the jets that were in it were 128 main and 42 pilot. The manual that came with the bike only covers up to 290 size engine size and stock for a 290 is a 125 main and a 48 (shown in the specs). Can anyone tell me what is stock on a '15 300 so I can be sure of what I'm supposed to have? I would like to have the stock clip position too if you know it. Many thanks!

Edited by fxstbi
Link to comment
Share on other sites

 

 
 

I finally got this bike dialed in and it runs great. I'm posting one more time just for anyone's future reference. The carb is set for 800' MSL, temp was 60 degrees F.

125 main & 48 pilot, stock JJH needle with the clip in the bottom groove, air screw one turn out. I expect the a/s might need tweaking as the temps climb into the 90's. It took several attempts to get where I am now but it was well worth the effort. I've not done much needle/clip changes on any of my bikes in the past but I saw dramatic changes in how the bike runs in the midrange making those changes. I think those changes are most noticeable on a trials bike because of the controlled use of throttle compared to my race bikes where I am accelerating and passing through the midrange going to WOT.

Link to comment
Share on other sites

 
 

Think i'm going to buy some jets for my '15 300 and have a play. I've already fiddled with float height as i've had problems with it leaking fuel. (Float wasn't shutting the valve) Currently the revs drop off on VERY steep descents, i think this is related to the float height as it can be made better by setting the fuel height lower (Is it possible fuel was spilling out of float bowl and making it excessively rich??) Also after a long hard (more than 20 seconds-ish) WOT the revs take an excessively long time to drop? Any ideas? I know very little about carbs (i was brought up with a laptop and injectors!!) so any help at all greatly appreciated.

Link to comment
Share on other sites

 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...