A35 Polini + 19mm PHBG Race Questions

B DM /
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So, I am in the process of rebuilding and restoring my a35. It has the 64cc Polini kit and the 19mm Dellorto PHBG Race carb, but It has never run as good as I think it should. It sat for a long time before I bought it and I bought it from someone who was the third owner of the bike. I have no idea who built it originally, but it needs some love. It is currently completely disassembled and being rebuilt (gaskets, seals, bearings, cables, brakes, tires, cleaning carbon build up in engine and exhaust, etc) while the frame gets powder coated.

I was reading through the PHBG wiki and came across the section about the "metal disk" in the PHBG carbs. I checked mine, and it was still there. So, I removed it. The bike immediately ran better, but not perfectly. I then read the section about the AN ( 4 stroke) vs AU (2 stroke) atomizers. It turns out that my carb has the 4 stroke atomizer and bushing. I understand that with the a35 reed block setup it is not necessary to replace the AN atomizer with the AU, but I am going to do it since it is a relatively cheap and easy thing to do. I also found out that the stock Tomos throttle has probably not been fully opening the slide on the 19mm race carb. I have ordered a new short pull throttle as well.

My question is this: since the carb was tuned with the disk between the jet and atomizer, the 4 stroke atomizer, and the stock throttle, how should I adjust the jets to compensate for all of this change?

I have noticed on the Tuning Spreadsheet that similar setups are running 100+ main jets. My current carb setup is a 70 main jet (if I'm reading it correctly see pic below), a 60 starter jet, a 45 idle jet, a W9 needle (on the lowest clip), and a 30 slide.

(Edit: Also the pipe is a technigas.)

I fear that this will be far to lean when I am able to fully open the slide with the new throttle and the other additions. Any advice for me? Thanks to anyone who read my novel!

20190420_181520.jpg

(edited)

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  A35 Polini + 19mm PHBG Race QuestionsTopic by: B DM B DM 04/20/19 06:24PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: pat splat pat splat 04/20/19 06:47PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/20/19 06:52PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Daniel '' Daniel '' 04/20/19 07:11PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/20/19 08:17PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/20/19 08:21PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/20/19 09:08PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/20/19 09:18PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/20/19 09:37PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/20/19 09:45PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: EH FCC of the QCB EH FCC of the QCB 04/21/19 04:29PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/21/19 10:02PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/20/19 09:59PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/20/19 11:00PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/20/19 11:32PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/21/19 11:45AM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Graham Motzing Graham Motzing 04/22/19 11:51AM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/22/19 03:54PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/22/19 09:11PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Mike Boyd Mike Boyd 04/22/19 09:18PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: P D P D 04/22/19 09:40PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/22/19 09:52PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: P D P D 04/22/19 10:10PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/22/19 10:17PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/22/19 09:50PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Mike Boyd Mike Boyd 04/22/19 11:35PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/23/19 01:05PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Buttcheeks BUZZARD Buttcheeks BUZZARD 04/23/19 02:05PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Graham Motzing Graham Motzing 04/23/19 11:38AM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/23/19 01:04PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Graham Motzing Graham Motzing 04/23/19 03:27PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/23/19 01:19PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Buttcheeks BUZZARD Buttcheeks BUZZARD 04/23/19 02:06PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Mike Boyd Mike Boyd 04/23/19 02:08PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/23/19 02:09PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Mike Boyd Mike Boyd 04/23/19 03:26PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: B DM B DM 04/23/19 04:05PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Daniel '' Daniel '' 04/23/19 03:13PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: * * * * 04/24/19 01:55PM
  Re: A35 Polini + 19mm PHBG Race QuestionsRe: Bill Mazzacane Bill Mazzacane 04/25/19 03:20AM

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