Figuring out what Stage Dynojet(see pics) and full exhaust system?

[firro]

Hi All,

As i mentioned in my previous post, i bought the bike like this , the owner has passed away, so im trying to figure out what kind of mods i have.
Can you guys tell by the pictures what stage mod i have? sorry if its a stupid question . im totally not familar with VMAX, slowly getting there though ; i need to get this out for peace of mind.

Firstly lets start with this Dynojet crap I was almost certain I had Stage 7, but what makes me doubt are two things and need your help with this.

1. V-Boost is still intact and functional, i've read that its uncommon to have V-Boost with Stage 7 configuration, yet not seldom.
2. I have a sticker under the fake tankcover saying: Dynojet 1

i also have four k&n air filter pods and this big pump( to prevent oil getting there?) thing in the middle of the filters.

And I also believe I have full exhaust system? or just the slipon?

Thanks again!!!

 

[Fire-medic]

Remove the CVC cap from a carburetor.

Remove the CV rubber diaphragm.

Remove the slide needle.

Compare it to this chart and see what you have.

Stage 1 is probably not what you have. The parts you have look like a Stage 7. The oil mist condenser, feeding oil back into the engine via the large diameter hose going to the oil filler cap on the right rear of the engine is what is between the 4 air filter pods.

Note that on the 5 slots/needles, the slot closest-to the 'blunt-end of the needle' gives you the leanest gas mixture.

Dynojet Stage 1 is hard to tune, do not buy it, and if you have it, you will probably find after all-sorts of frustration attempting to make the Stage 1 work well, you will be happier going back to OEM jetting.

Dynojet main jet numbers are not the same as OEM Mikuni jet sizes. They (Dynojet) are higher numbers for a same-size equivalent Mikuni size (lower numbers).

The DJ Stage 7 uses an air corrector to limit air inflow for that small port having a brass jet, in the carburetor bellmouth (the top of the carburetor)






The 'long chart,' courtesy of Sean Morley [email protected]

Note OEM USA bikes do not have 5 slots in the needles, just 1.

From the factory service manual:





https://www.jetsrus.com/FAQs/FAQ_mikuni_vs_dynojet_vs_keihin_sizes.htm

 

[firro]

Remove the CVC cap from a carburetor.

Remove the CV rubber diaphragm.

Remove the slide needle.

Compare it to this chart and see what you have.

Stage 1 is probably not what you have. The parts you have look like a Stage 7. The oil mist condenser, feeding oil back into the engine via the large diameter hose going to the oil filler cap on the right rear of the engine is what is between the 4 air filter pods.

Note that on the 5 slots/needles, the slot closest-to the 'blunt-end of the needle' gives you the leanest gas mixture.

Dynojet Stage 1 is hard to tune, do not buy it, and if you have it, you will probably find after all-sorts of frustration attempting to make the Stage 1 work well, you will be happier going back to OEM jetting.

Dynojet main jet numbers are not the same as OEM Mikuni jet sizes. They (Dynojet) are higher numbers for a same-size equivalent Mikuni size (lower numbers).

The DJ Stage 7 uses an air corrector to limit air inflow for that small port having a brass jet, in the carburetor bellmouth (the top of the carburetor)



View attachment 94566

View attachment 94567
The 'long chart,' courtesy of Sean Morley [email protected]

Note OEM USA bikes do not have 5 slots in the needles, just 1.

From the factory service manual:

View attachment 94568

View attachment 94571

https://www.jetsrus.com/FAQs/FAQ_mikuni_vs_dynojet_vs_keihin_sizes.htm

Thanks a lot for the info!! very useful; i will try to figure out next weekend..

i do remember the old lady saying that the needles were renewed last year.
at the moment the bike has issue when opening throttle from start, it feels like it doesnt get enough fuel when opening the throttle and wants to stall, if i keep the choke half open, then its no issue. So it makes me wonder maybe they have installed OEM needle instead of Stage 7 needle; hence the stalling issue....dunno just thinking out loud

nevertheless carb cleaning and sync will happen and a good inspection.

 

[Fire-medic]

I suspect that will likely solve your "I have to run at part-choke" issue.

 

[MaxMidnight]

Rather than start a new thread it would be better if you continued from your previous post so that the same information previously given isn't duplicated.
The help previously offered still stands.

 

[CaptainKyle]

Plenty of people run vboost with the stage 7. It's way better that way in my opinion

 

[Fire-medic]

I am one of the VBoost and Stage 7 people also. It surely is easier to synch the carbs with it.

 

[dannymax]

Never could see any reason to eliminate the VBoost...just complicates your sync procedure.