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New pilot jets look different from ones in carb

  • Thread starter Thread starter Zero260
  • Start date Start date
Z

Zero260

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I've been chasing a rich running problem and decided to get new pilot jets, but the ones I ordered look very different from the ones in there. they are both 40s like they should be, I just need expert opinion on which ones are correct. left was in it, right is new

81 GS 850G
 

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Thats what I figured. The bike runs real lean now. But I set the float levels to the minimum spec so I'm going to reset fuel level to midrange or highest spec and do some testing. It sucks iI have to experiment again, but I'm excited this is the first time new plugs weren't black within 15 mins of riding
 
Fuel level raised and runs alot better. Might have to go up on main jets. All I have done is a Mac 4 to 2 that came with bike. Should I have to jet with that?
 
As long as you have oem airbox, and it's sealed properly shouldn't need to rejet. Maybe one step on mains.
 
Are you running the K&N stock air filter replacement as well? If so, you might consider going up a couple on the main. 120's should work pretty good in your case. If it's just the exhaust that's been changed out then you may not need to do anything at all.
Do a plug chop and see where you are. Start with the mains first and work your way down. That's AFTER you've synced and adjusted the carbs.

Have you adjusted the pilot screws? If not, then you need to do the fastest idle method adjustment on those as well.

If, after changing out the mains, you still seem a little lean at cruising, then try raising the needle a little. You can do that by replacing the plastic spacers with 3 metal washers. You can also file down the plastic spacers but make sure you do it in small increments and use a micrometer or caliper to verify each one is the same height.
 
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