Dynoed the build!
Thread Starter
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Tourer
Joined: Mar 2006
Posts: 403
Likes: 28
From: Carlisle, PA
Dynoed the build!
Just went to the HD dealer to get a base dyno on the build. Still need to do some jetting. AFR line is steady but fat and I will probably go a jet lower in each circuit and maybe move the needle clip up to the 2nd from the top.
Should pick up some more torque. HP seems low to me but I had retarded my spark advance a bit because I thought it was pinging. Also stock head pipe is probably not helping me but I will not be going 2 to 1. Just doesn't fit my bike style.
Might visit Dr. Dyno when I go to Laconia this year to see if he can get me any more out of it.
Has good pick up and runs smooth. Did all the tuning by the Mikuni manual.
Current jetting: 25 pilot, 97 needle with clip in middle, 165 main and 70AP nozzle.
Build in sig. I usually never go past 4,000 rpm when riding so HP up high is not that important to me.
Dyno sheet and blown up AFR graph attached as pdf.
Any advice?
Should pick up some more torque. HP seems low to me but I had retarded my spark advance a bit because I thought it was pinging. Also stock head pipe is probably not helping me but I will not be going 2 to 1. Just doesn't fit my bike style.
Might visit Dr. Dyno when I go to Laconia this year to see if he can get me any more out of it.
Has good pick up and runs smooth. Did all the tuning by the Mikuni manual.
Current jetting: 25 pilot, 97 needle with clip in middle, 165 main and 70AP nozzle.
Build in sig. I usually never go past 4,000 rpm when riding so HP up high is not that important to me.
Dyno sheet and blown up AFR graph attached as pdf.
Any advice?
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
I understand that the tune is a "break in" tune and the AFR is a bit fat but a 98" build, even with a small cam like the 26 should break the 100TQ mark, early, and perhaps see close to 110TQ with a final tune. Dealers don't have great track record when it some to tuning and tuning a Mik is even more a challenge for most that have only dealt with EFI motors. Get the bike in front of a real tuner to get what the build is capable of; you are not there yet.
Thread Starter
|
Tourer
Joined: Mar 2006
Posts: 403
Likes: 28
From: Carlisle, PA
I understand that the tune is a "break in" tune and the AFR is a bit fat but a 98" build, even with a small cam like the 26 should break the 100TQ mark, early, and perhaps see close to 110TQ with a final tune. Dealers don't have great track record when it some to tuning and tuning a Mik is even more a challenge for most that have only dealt with EFI motors. Get the bike in front of a real tuner to get what the build is capable of; you are not there yet.
That is why I stated in my post that I will get Dr. Dyno to give it a look. I really don't trust any of the tuners by me after asking them questions and wish I had a warm and fuzzy feeling about them but I don't.
I agree I should be making more TQ and HP!
Club Member
Joined: Apr 2013
Posts: 5,769
Likes: 3,766
From: Cape Cod
14.7 is VERY lean......hell, that's what the MOCO sets it at for EPA requirements.....and the AFR should change due to load......WOT should be fairly rich .......cruise a bit leaner.....AFR graph should not be so flat.......find a good dyno guy, he'll know what to do........NOT a stealer
Road Warrior
Joined: Feb 2009
Posts: 1,274
Likes: 130
From: Now Western TN
You should contact Chad down at Wide Open Cycle. It would be about 3 hours for you to get down there (Fredericksburg VA) but it would be worth the drive IMHO.
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14.7 is an emission afr and is very lean for light load cruise not heavy load accel.
Carbs are maximized by using the more air - less air test and can actually be a little difficult to tune entirely by afr.
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Joined: Dec 2007
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We are VERY good with carb tuning, and have been tuning for well over 20 years now, and yes, there is more lurking in that combo.
North of 100 ft/lbs should be in easy reach.
Scott
