Installed Mikuni carb today, have a question
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Road Warrior
Joined: Oct 2010
Posts: 1,554
Likes: 52
From: Ottawa Canada
Installed Mikuni carb today, have a question
Today the weather was just great for November, so i decided to install my new Mikuni HSR42, install went good , i did have to file the top barrel fin just a little, set the idle and AF mixture screw. Throttle response is impressive, even feels like it pulls harder, low speed cruising is smoother and engine revs up quicker. So here is my question, when cruising at around 35mph and i give it full throttle it will hesitate, i have read the tuning guide and frankly a little confused. What would you recommend to eliminate this hesitation? Do i move the c clip down to the 3rd notch or is it jetting or accelerator pump adjustment.
Motor specs are 88ci with S&S air cleaner, stock headers with SE slipons and a SE203 cam
Carb setup is 165 main, 50 AP pump, 20 pilot and needle clip on 2nd notch, this setup is what i have found on this forum from other members and went this route
THX for any and all assistance
Motor specs are 88ci with S&S air cleaner, stock headers with SE slipons and a SE203 cam
Carb setup is 165 main, 50 AP pump, 20 pilot and needle clip on 2nd notch, this setup is what i have found on this forum from other members and went this route
THX for any and all assistance
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
Today the weather was just great for November, so i decided to install my new Mikuni HSR42, install went good , i did have to file the top barrel fin just a little, set the idle and AF mixture screw. Throttle response is impressive, even feels like it pulls harder, low speed cruising is smoother and engine revs up quicker. So here is my question, when cruising at around 35mph and i give it full throttle it will hesitate, i have read the tuning guide and frankly a little confused. What would you recommend to eliminate this hesitation? Do i move the c clip down to the 3rd notch or is it jetting or accelerator pump adjustment.
Motor specs are 88ci with S&S air cleaner, stock headers with SE slipons and a SE203 cam
Carb setup is 165 main, 50 AP pump, 20 pilot and needle clip on 2nd notch, this setup is what i have found on this forum from other members and went this route
THX for any and all assistance
Motor specs are 88ci with S&S air cleaner, stock headers with SE slipons and a SE203 cam
Carb setup is 165 main, 50 AP pump, 20 pilot and needle clip on 2nd notch, this setup is what i have found on this forum from other members and went this route
THX for any and all assistance
Outstanding HDF Member
Joined: Aug 2009
Posts: 2,938
Likes: 4
From: NC
Flat slide carbs like the HSR you have dont like it when the engine is lugged down. and you twist the throttle wide open without down shifting. The CV carb would only lift the slide as much as the engine needed, as opposed to the carb you have now which lifts as far as you twist the throttle. This can cause what feels like a bog.
I agree with previous poster. Tinker with the accelerator pump settings.
I agree with previous poster. Tinker with the accelerator pump settings.
Cruiser
Joined: Oct 2007
Posts: 173
Likes: 0
From: Detroit, MI
Im thinking the acc pump adjustment would an issue from a start like at a red light but your saying your cruising at 35mph. Im thinking needle adjustment so the safer option would be to go richer (clip down one) since this time of year the air is cooler and more dense. I have to assume with the jetting you mentioned, you might be just a hair lean.
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Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
Probably the accelerator pump if that's the case.