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Fuel Fuel Delivery


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October 21st, 2019, 08:58 AM   #31
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Correction, Im using idle jet size 52.

One tip to dellorto users is to check the needle play, both horizontally and vertically.
On old bikes especially the big engines have strong vibrations that will wear down parts on and around the needle. In my case I was lucky that I could use shims to stabilize the needle, the wear of the needle-valve and needle-jet could I compensate by lowering the needle one clip.
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October 22nd, 2019, 12:23 AM   #32
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Hey Mazzoki.
If you are asking if you can compensate for wear by lowering the needle then yes but no.
Yes it will improve it but no it will not solve the problem.

Needle and more importantly, needle seat(the brass bit in the carb body the needle slides in) wear is a product of the pulsating forces from the motor banging the needle back and forth whilst it is moving up and down which creates an oval shaped hole in the seat and thus the round needle no longer fills the oval hole to control fuel flow.

Ideally you should renew both needle and seat.

If thats not what your asking then ive just wasted a few minutes of my, and yours if youve got this far...... time.
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October 22nd, 2019, 05:32 AM   #33
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The bike (the engine)has run flawless this autumn on the enduro-trail/track I ride.
Im just sharing my experience!
I have red about oval-wear on the needle-jet but in my case the wear was as round as it possible can be, so no problem at the moment
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