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Fuel Fuel Delivery

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June 29th, 2017, 08:30 AM   #11
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Originally Posted by zaga View Post
Sorry didn't read your first post with much time

Here you have the needle, it's like this

thsnks for that
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June 29th, 2017, 10:45 AM   #12
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Originally Posted by zaga View Post
Here you have a dellorto manual

It's not specific about your carb, but if you like the subject it's an interesting reading

It's a beauty that one. What more does one need!

I quote that one also when someone needs a hand understanding the circuits.
Thanks from zaga
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June 30th, 2017, 01:30 AM   #13
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In my view the std jetting should be your starting point, but you also should try to find your bike's jetting.

If you understand what influences what and learn to listen what your engine is telling you, you can fine tune it.

Here you have one example comparing std jetting for 3 years, that basically are to the same engine. Even they made changes from year to year.

This is if you want to take the trouble and the time

Attached Thumbnails
Setting the clip on the neadle-jetting_fe400_01_03.jpg  
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July 1st, 2017, 06:54 AM   #14
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Hello Yozzer. To make life easier, avoid clip numbers. We always say "raising the needle, or lowering the needle". Raising it fattens the mid-range, lowering leans it. In practice, it alters your fuel / air ratio in all throttle positions. Easiest test? Cruise along in a upper gear, then snap throttle to 2/3 open, no more than that. If all is right, bike will pull nicely. To see if it is too lean, do above test, then after 1 second dial throttle back a touch. If bike accelerates at all, needle is too lean. When happy with that, repeat above test, except use wide open throttle to see if main jet is right. Same diagnosis. Added bonus, engine starts and warms up way easier when needle is correct. This routine is exactly what everyone did all the time when struggling to get our over stressed air-cooled super bikes to run right. Then re-adjust the idle-air screw for fastest idle possible, followed by lowering idle speed to normal with idle knob. Yes, we did this on bikes with 6 carbs. Crazy I know. Even worse was mid size bikes where the 4 carbs were crammed in a far to small space. Mind you, these Mikuni or Kehin carbs were great to work with. Delorto carbs on old Ducatis or BMWs took a bit of wizarding to fix. One suspects the same applies today.
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clip, neadle, setting

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