Dial-A-Jet?

[5_19]

Anybody on this board using DAJ? Any pros or cons? Do they work as advertised? It sure seems like a very practical product. TJ

http://www.thunderproducts.com/dial_a_jet.htm

[Bone]

I don't but Dag Verpeide did and has a write-up on his site.


http://www.valkyrienorway.com/index.html

[98valk]

it works but has its limitions like everything else.  I was the second person to buy ('01) and install it on a valkyrie according to the owner. starts to work in the needle/mid range all the way to the main jet. Idle to 1/8 throttle which is hwy cruise, its not working. I have noticed that it tends to kick in like a six pac carb setup. it starts out as a smooth transition and then its hold-on. I believe this has more to do with my airbox mods than really the DAJ.

foam filters and o-rings will rot and fall off after a few yrs. made my own with some foam and tie-wraps. fuel tubes went bad last yr, replaced with latest tygon tubing.

[Dag]

Best spent $ on my bike....  
I installed the DAJ in 2006
http://www.valkyrienorway.com/Dial-A-Jet%20NEW.html

Changed to #95 main jets and #38 slow jets.


98 HP before DAJ
106 HP with DAJ


Here you can see the comparison between my Valk with DAJ and a 2000 Standard without DAJ.
The top graph shows that I have 30ft.lbs more torque at the same RPM
The lower graph shows the difference in throttle response. The response is immediate with DAJ

[Ricky-D]

Hey Dag, did you use the replacement drain screws or did you tap into the float bowl?

Thanks, Ricky-d

[Dag]

Hey Dag, did you use the replacement drain screws or did you tap into the float bowl?

Thanks, Ricky-d

I used the replacement drain screws.

[5_19]

Hi Dag, Nice write up! How are you doing? Going to TX GOTF in a few weeks?

Here you can see the comparison between my Valk with DAJ and a 2000 Standard without DAJ.
The top graph shows that I have 30ft.lbs more torque at the same RPM
The lower graph shows the difference in throttle response. The response is immediate with DAJ

I understand the 30ft. lbs increase graph. However you are comparing a 97' and a 00'. It is my understanding that the 97's have a different camshaft, larger carbs and make more horsepower anyway. How much off this do you contribute to the DAJ? You have had it on your bike for 5 years now. It sounds like best off both worlds, more hp and better fuel economy when your cruising. 

CA  ExhaustCoatings

Idle to 1/8 throttle which is hwy cruise, its not working

Did you change to smaller jets like DAJ recommends? What size did you use?

My bike is a 01' Standard with IS springs and IS ECM. Stock jets, desmogged, stock exhaust and adjustable needles left over from a previous installed Cobra exhaust system. What do you think I can expect performance wise if I install DAJ.

[98valk]

Hi Dag, Nice write up! How are you doing? Going to TX GOTF in a few weeks?

Here you can see the comparison between my Valk with DAJ and a 2000 Standard without DAJ.
The top graph shows that I have 30ft.lbs more torque at the same RPM
The lower graph shows the difference in throttle response. The response is immediate with DAJ

I understand the 30ft. lbs increase graph. However you are comparing a 97' and a 00'. It is my understanding that the 97's have a different camshaft, larger carbs and make more horsepower anyway. How much off this do you contribute to the DAJ? You have had it on your bike for 5 years now. It sounds like best off both worlds, more hp and better fuel economy when your cruising.  

CA  ExhaustCoatings

Idle to 1/8 throttle which is hwy cruise, its not working

Did you change to smaller jets like DAJ recommends? What size did you use?

My bike is a 01' Standard with IS springs and IS ECM. Stock jets, desmogged, stock exhaust and adjustable needles left over from a previous installed Cobra exhaust system. What do you think I can expect performance wise if I install DAJ.

No. I have a completely different setup and airbox. I use the DAJ to fill in any lean gaps, esp since I ride most of the yr, 20-25F to 100+F in my area. mikuni recommends a one size change on the main jet for every 25F change in ambient temps, so as to maintain the same level of HP.

u are incorrect about the '97 valks. all valks have the same carbs, jetting and needles, all have the same cams except the calif bikes which have emission cams which will increase mpg and lower HP slightly. Motorcycle consumer news along with DPR racing have stated that all '98s also have the calif cams. there was a member on here yrs ago that actually checked '98 verses another non-calif bikes cams and found no difference. there is a thread on http://www.gassavers.org/ of a valk rider actually switching to the calif cams and picked up some mpg.
there are many dyno runs out, and stock '97s do not make any more HP than other yrs, when put on the same dyno, same conditions and same operator.
now watch the flames from '97 owners.
 my '98 made 100 HP with my airbox mod, jetting, DAJ and glass pack exhaust at 62.9F. at inzane II, same setup 97.5 HP at 92F.

[5_19]

Best spent $ on my bike....  
I installed the DAJ in 2006
http://www.valkyrienorway.com/Dial-A-Jet%20NEW.html

Changed to #95 main jets and #38 slow jets.


98 HP before DAJ
106 HP with DAJ


Here you can see the comparison between my Valk with DAJ and a 2000 Standard without DAJ.
The top graph shows that I have 30ft.lbs more torque at the same RPM
The lower graph shows the difference in throttle response. The response is immediate with DAJ

Dag, the manual shows the main jet is a #100 and for the slow jet a #35. I can understand the #95 however I don't understand the #38. Unless #38 is smaller than #35?

[Dag]

I`ll explain...   

It started in 2005 when I bought my valk. It was running rough so I placed it with a local Honda shop
to check the carbs. I remember it cost close to $600,00 and the bike was worse than before.
I contacted another Honda shop and they told me they knew what it was and they could fix it. Another 5 - 600$ spentand the bike sounded like a popcorn machine after this professional work 
Than I decided to do the maintenance myself. I bought a portable exhaust gas analyzer from Blanke Industries http://www.blankeindustries.com/products/newseries2500.htm -About $3.000 incl. tax and freight cost. I made my own carb sync tool

Gave my motorcycle garage a face-lift
It looked like this

And ended up like this


I bought all necessarry tools and started my experiments.
First I synced the carbs. Than I measured the Carbon Monoxide, and could conclude that the engine was running too lean, both at idle and at higher rpm
Thats when I changed the slow-jets to #38 and installed the DAJ. What happened now was perfect at idle, but too rich at higher RPM. So I decided to take the carbs out again and change the main-jets to size #95.
DAJ has no effect at idle. It needs RPM in order to build up enough vacuum to suck fuel from the carburetor bowl and through the DAJ nozzles.
I have spent many hours fine-tuning before I achieved this result.
I'm not a mechanic, but had as a hobby to fix cars when I was younger
What I have learned about the Valk, I experiment my way to, in addition to that I have received very much help here on this forum.

[5_19]

First I synced the carbs. Than I measured the Carbon Monoxide, and could conclude that the engine was running too lean, both at idle and at higher rpm
Thats when I changed the slow-jets to #38 and installed the DAJ. What happened now was perfect at idle, but too rich at higher RPM. So I decided to take the carbs out again and change the main-jets to size #95.
DAJ has no effect at idle. It needs RPM in order to build up enough vacuum to suck fuel from the carburetor bowl and through the DAJ nozzles.
I have spent many hours fine-tuning before I achieved this result.

..... So Dag looking back at all the things you did to get your carbs tuned, do you think the DAJ is still neccessary or could you have done without DAJ and accomplished the same with rejetting. That's in heck off a tool. Makes me wonder how our forklift is running!

I think I know the answer. The DAJ helps out during temp and elevation changes. What are your thoughts on that?

[BIG--T]

it works but has its limitions like everything else.  I was the second person to buy ('01) and install it on a valkyrie according to the owner. starts to work in the needle/mid range all the way to the main jet. Idle to 1/8 throttle which is hwy cruise, its not working. I have noticed that it tends to kick in like a six pac carb setup. it starts out as a smooth transition and then its hold-on. I believe this has more to do with my airbox mods than really the DAJ.

foam filters and o-rings will rot and fall off after a few yrs. made my own with some foam and tie-wraps. fuel tubes went bad last yr, replaced with latest tygon tubing.

Hey CA, What kind of mods did you do to your airbox?  I was going to until a lot of members advised against it. I read some old post where they had to plug holes, etc. For the most part I've always owned V Twins and modding an airbox or buying one with a set of good aftermarket pipes always made a huge difference. I have Cobras on and curious about your air mod.
Thanks 

[98valk]

here u go Xguy with some pics. the ones that have advised not to mod the box are from others who yrs ago were putting holes in the top of the lid. that doesn't work due to the airflow across the top of the airbox from the forward movement of the bike. this causes all types of air turbulence including restricting air into the airbox.

http://www.valkyrieforum.com/bbs/index.php/topic,8248.0.html

[Dag]

..... So Dag looking back at all the things you did to get your carbs tuned, do you think the DAJ is still neccessary or could you have done without DAJ and accomplished the same with rejetting. That's in heck off a tool. Makes me wonder how our forklift is running!

I think I know the answer. The DAJ helps out during temp and elevation changes. What are your thoughts on that?

Thunderproducts sayes that DAJ allows you to run in a broad temperature or altitude range without rejetting. That's probably true, but it's not something that I have emphasized.
I would have been able to tune the engine in a much easier way if I not installed DAJ. The reason why I installed it was to fill the lean spots and get more power (I was not totally convinced it would work, so I had to try) So the real reason was curiosity.
If I should rate this product I would give 5 stars for these three things:
Throttle Response
Power
Fills in the lean spots

[Blackduck]

CA,
There are actually different numbers for the 97 carbs, it will only be minor changes. Maybe even just the different needles that are in them. We have a 97 and another set of 97 carbs and the needles are different.
I tried a couple of times before to find out from menbers in other country's what numbers are on their needles. I am in Australia and my manual does not cover Stateside bikes or a few other countries.
I covers some European and South Africa. The Swiss have different listed carbs and needles, also  the first listing I have seen for the Pair valves, my 98 did not have them.
There is also a slight difference noted in primary gear ratios in the gear box.
There were originally different part numbers for 97 cams but they are all now superceded to the same number.
I will having a look at the cams in the mates 97 to see what if anything is different.
I am with you on the air box mods, mine is opened and works well but it is not a simple job. A lot of messing with jetting is required.
Cheers Steve