VM20 needle jet options

[Tether]

I need a new needle jet and jet needle for my Ace 100 motor (VM20). Since the N-6 jet and the 4F6 needle seem to be unavailable is there a substitute that can be used and found?

[JPark]

Both these are listed on Hodaka Parts; have they run out? It's listed as a 129-N6 but the 4F6 is just 4F6. I need to replace a borrowed set some time so would also like to know.

[JPark]

JetsRus still lists the 4F6 needle but 129 series jets don't seem to be listed there and they would have them if they existed, you would think.

[Tether]

Thanks JPark.
I was confused because I don’t completely understand the numbering system. So the 129 series N6 is what I need?
HPI lists 6F4 is this the same needle as 4F6 ?

[JPark]

6F4 is different from 4F6. The jets are in series like 129 , 159 etc. The 129s seem to be obsolete. I hope Terry still has some.

At $15 for a needle and $20 for a jet it's not really expensive, considering the precision involved. Resizing old jets might be possible if you had a method of building the orifice up and a precision reamer. Making needles would be pretty fussy...

Adapting something from another series might be a better way to go if you could find something suitable.

I ended up on a Mikuni site which goes into the numbering and dimensions, tapers etc.

And, yes, it's 129 series N6 jet.

[JPark]

The series number will be stamped into the barrel of the jet, near the bottom.

[Tether]

Thanks for the help.
I ordered the jet from HPI. He does not have and 4F6 needles.

[JPark]

Try jetsrus.com to see if they still have any 4F6 needles; let us know.

[taber hodaka]

4F6 I will look for you. ---Clarence

[Tether]

I looked on jetsrus.com and did not find 4F6 needles. I sent them an email asking if they had any or knows of something compatible . This was his response:

“I do not know of a source for it or a compatible sorry”

[JPark]

Look under needles, then Mikuni, and it's listed with dimensions and such under #4 series. There are three no longer availables on the list but 4F6 is still up. Maybe time to update the list.

They still list a VM 20 newer style in flange mount but I think the stud spacing is different and the air cleaner end will no doubt be a 'whole nuther'. Jetting would be a project but once determined we'd be away. Has anyone done this yet?

[JPark]

Tether, the 4F10 needle is still on the list at jetsrus and is very close in dimension. Could you ask them if it is still available?

[Dale]

Hodaka-Parts offers a VM20 rebuild kit. It appears to contain everything except a new nozzle. It does not state the specifics on the needle so a call to Terry would be needed to determine that.
http://hodaka-parts.com/item.asp?PID=3388

[Tether]

Ha! I had forgotten that I bought one of those rebuild kits! I just checked and it is indeed a 4F6. That’s good news. With the jet that is on its way I should be good to go.

[viclioce]

I will check to see if I have a 4F6 needle for you. I have 5 or 6 needles in my carb box. Victor

[viclioce]

OK. I looked. I have a 4D6 and a 4J6 but no 4F6. Sorry! Victor