Dyno Jet kit
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Seasoned HDF Member
Joined: Dec 2010
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From: Coromandel Peninsula New Zealand
Dyno Jet kit
I fitted a Dyno Jet kit...well, a Custom Chrome copy to my CV carby.......I left my 48 low speed jet in and went up to a 190 main and it ran fine over 2,000 RPM....very well actually and I was totally pleased with that part of it but it ran like a scabby dog below 2,000 and I had to wind my adjustable accelerator pump back as lean as it would go without the needle falling out to get to the shop to get a new low speed jet without fouling plugs.
So I changed my low speed jet to a 42, set the accel pump to 2 turns weaker than before the conversion and its fine, great even.....anybody else have any set up stories to share about dyno jet kits or similar?
So I changed my low speed jet to a 42, set the accel pump to 2 turns weaker than before the conversion and its fine, great even.....anybody else have any set up stories to share about dyno jet kits or similar?
Last edited by Spanners39; Apr 6, 2011 at 06:31 PM.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,897
From: Bedford UK
Hi from the UK! The only bikes I have tinkered with like that are my old Glide, when it was relatively new and I fitted a jet kit to it (now long behind us both!), also my Dyna when I did the same. The Evo was fine, but the DYna needed some expert help to get it running right. I must confess I turned to my local dealer, who sorted things out just fine.
Road Warrior
Joined: Oct 2009
Posts: 1,251
Likes: 1
If your running a stock motor, 48 is entirely to large, also. Try going back go the stock emulasion tube ....the aftermarket ones seem to draw differently then the oem ones, and last but not least, I'm not a fan of enlarging the vacuum hole in the slide,
Road Master
Joined: May 2009
Posts: 1,232
Likes: 8
From: Powder Springs, GA
If you don't mind me asking, why are you not a fan on enlarging that vacuum hole? I was about to do it but have not yet. I was going to shim the needle up a bit as well.
Elite HDF Member
Joined: Sep 2007
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From: Bluffton, South Carolina
Spanners, what adjustable accelerator pump are you talking about on a CV??
200FLST, drilling out the slide or putting in a weaker spring works much better on the track than it does on the street. It causes the slide to open up too soon, and can cause a "Sawtooth" line on the dyno as it fluctuates up and down. Do not shim the needle, just get the '88 Sporty needle, you will be much happier. Hope this helps.
200FLST, drilling out the slide or putting in a weaker spring works much better on the track than it does on the street. It causes the slide to open up too soon, and can cause a "Sawtooth" line on the dyno as it fluctuates up and down. Do not shim the needle, just get the '88 Sporty needle, you will be much happier. Hope this helps.
Spanners, what adjustable accelerator pump are you talking about on a CV??
200FLST, drilling out the slide or putting in a weaker spring works much better on the track than it does on the street. It causes the slide to open up too soon, and can cause a "Sawtooth" line on the dyno as it fluctuates up and down. Do not shim the needle, just get the '88 Sporty needle, you will be much happier. Hope this helps.
200FLST, drilling out the slide or putting in a weaker spring works much better on the track than it does on the street. It causes the slide to open up too soon, and can cause a "Sawtooth" line on the dyno as it fluctuates up and down. Do not shim the needle, just get the '88 Sporty needle, you will be much happier. Hope this helps.
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Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
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From: Coromandel Peninsula New Zealand
Boyesen Twin Shot...was on the bike when I got it from CA.
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Road Warrior
Joined: Oct 2009
Posts: 1,251
Likes: 1
Spanners, what adjustable accelerator pump are you talking about on a CV??
200FLST, drilling out the slide or putting in a weaker spring works much better on the track than it does on the street. It causes the slide to open up too soon, and can cause a "Sawtooth" line on the dyno as it fluctuates up and down. Do not shim the needle, just get the '88 Sporty needle, you will be much happier. Hope this helps.
200FLST, drilling out the slide or putting in a weaker spring works much better on the track than it does on the street. It causes the slide to open up too soon, and can cause a "Sawtooth" line on the dyno as it fluctuates up and down. Do not shim the needle, just get the '88 Sporty needle, you will be much happier. Hope this helps.
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