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Fuel Fuel Delivery


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July 9th, 2017, 03:32 AM   #41
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No, it is a fuel screw, or to be more precise, a pilot screw because you are controlling a pre-set fuel/air mixture. you can't shange or alter the ratio but you can change the amount of the mix the engine gets.

overall, the air/fuel mixture coming out of that tiny hole is very rich, therefore more if it makes the overall mixture of the bike richer.

I visualise it by being in a helicopter over a river, the river is a light pink dye, coming into the river is a stream, the stream is a dark rich blackcurrant red (Ribena). before the stream entered it was a pink river, downstream from the the merger is now red.

so 2.5 turns out means that your PJ is too small.

larger PJ = PS out 1.5 turns.

regards

Taffy
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July 9th, 2017, 04:58 AM   #42
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Ok, and I have a size 52!!
But my throttlestop is modded so my throttlestop makes it about 2-3mm higher than a normal idle-screw that is screwed in all the way.
In my experience the torque will be improved from idle when opening the throttle(and under idle) this way, never stalls with a good mixture (unless the sparkplug gone to black).

Last edited by Mazzokie; July 9th, 2017 at 05:05 AM.
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July 9th, 2017, 06:01 AM   #43
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so is this a round slide PHM or a square slide VHSB?

that 52 is very rich but correct if you have a large slide cutaway like 6mm ('60' punched underneath)

I have to question whether you are on the right tracks at all....

Taffy
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July 9th, 2017, 10:00 AM   #44
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I have a square slide VHSB.
The bike goes and starts better than ever (8 years ownership)
so Im just going to finetune "the winning consept".
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July 10th, 2017, 12:15 AM   #45
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good luck. but 2.5 turns out on the PS indicates that you need a larger PJ....

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July 10th, 2017, 01:13 AM   #46
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On a vhsb it means the contrairy
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July 10th, 2017, 03:55 AM   #47
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I stand corrected. I should have checked where the 'air screw' is.

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July 10th, 2017, 10:31 AM   #48
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this is the closest I found on the internet, here is the place of "the screw"

https://www.kartingshop.nl/5276-thic...-rotax-max.jpg
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July 10th, 2017, 11:40 AM   #49
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Yes that is the vhsb . And it has a air screw . Unscrew and it gets leaner . 2-3 turns out is normal on these
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July 11th, 2017, 12:01 AM   #50
ede
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Just for your interest:
Dellorto Info and parts can also be found here:
komplette Vergaser - Stein-Dinse Online-Shop

They provide nearly everything for Dellorto. They actually have a Ducati background but provide the complete Dellorto range. They're located in the northern part of germany, between Wolfsburg and Hanover...
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