Author Topic: Seeking Convert jetting advice.  (Read 1416 times)

Offline bigbikerrick

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Seeking Convert jetting advice.
« on: November 30, 2023, 12:13:08 PM »
Hello Folks, my 76 convert currently has 125 mains and 50 pilot jets. The slides and atomizers are what comes stock with the VHB 30s.  The bike has never needed the enrichners ( choke) to start cold, and even though the temps have been in the low 40s F, if I use the "choke", the bike will not fire up at all. It will start right up with two initial twists of the throttle, and responds to the throttle well, even when cold. This leads me to believe it is jetted too rich, in the idle circuit,although, it idles well with the mixture screws 2 turns out.
The bike has K&N pods,and free flowing mufflers, and H pipe.  I am at 4000 ft above sea level.
My question is should I start by installing smaller sized idle jets, say 45s or smaller, or would the fact that the screws are  currently,at 2 turns out, mean I should not decrease the idle jet size?
This is the first carbed guzzi I have owned where the enricheners would prevent it from starting even when the weather is cold. Other bikes will start, and you can tell right away, the choke is not needed, as in "chuff", "chuff", and then you switch it off. This convert wont even fire with the enrichers on, even if you hold the throttle wide open. It has to have the throttle closed, and the "choke" off.
any advice/ suggestions much appreciated
Rick D.
« Last Edit: November 30, 2023, 02:46:55 PM by bigbikerrick »
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Offline guzzisteve

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Re: Seeking Convert jetting advice.
« Reply #1 on: November 30, 2023, 06:29:51 PM »
I would leave it alone jetting up some on main, choke is most likely an 80. I would put in a 60 and it may work as designed.
All mine will start cold w/2 twists of throttle then open a hair on starting & no choke. A 50 pilot would be in the 2- 2 1/2 or 3/4 range for a mixture screw.
Ride it don't worry.
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Offline Tom H

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Re: Seeking Convert jetting advice.
« Reply #2 on: November 30, 2023, 07:07:44 PM »
FWIW: My Eldo does not like choke. My 1000 round fin, will not start when cold without the choke. My Ambo also did not like the choke.

So if your bike does not need the choke on a cold start, and the jetting is basically correct. Leave it alone!

Tom
2004 Cali EV Touring
1972 Eldo
1970 Ambo V1000
1973 R75/5 SWB with Toaster
1973 R75/5 LWB
2007 HD Street Bob
1953 Triumph 6T (one day it will be on the road!)

Offline bigbikerrick

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  • 73 Eldo, 98 V 11 ,12 Ural Gear Up, 76 Convert,
  • Location: Southeastern corner of Arizona, right next to "Old Mexico, and New Mexico"
Re: Seeking Convert jetting advice.
« Reply #3 on: November 30, 2023, 07:52:57 PM »
Thank you, Steve and Tom, for the replies. I will check the number on the enricher, to see if it has an 80 or 60.  From what you guys tell me, I guess all bikes are a bit different, in small ways.
thanks
Rick.
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