I had trouble with the athena 50 reedvalve kit, with a 19mm PHBG and a boss pipe. I just couldn't get the reeds to open at low RPMs. Though I'd think the simonini would be a big enough pipe to get them to open. I ended up switching to a 16mm mikuni and an estoril, and now it's MUCH better
Re: PHBG tuning issues, idle jetting
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