hand adjustable fuel mixture screws for TRX ???

[pininfarelo]

wouldnt be too hard to make a set honestly. I got a spare set of mikunis here i can inspect / measure if theres enough need.

I would be interested in purchasing a set if you get them.

[Homer]

While I've been sitting around twiddling my thumbs, waiting for my tubes and needles to arrive from the US, I decided to have a look at re-setting the mixture screws on the carbys, only to find you can barely access the screws because of their position..

009 (3).JPG

A search for easily adjustable mixture screws led me to this thread, amongst others, and it quickly became apparent that you simply can't buy them, so I thought I'd have a lash at making them myself.

Luckily I has a couple of stainless knurled knobs that my dad made me at work, when I was about 15. I'm now 51, and no I never throw anything away!

I started out by carefully grinding the slotted end of the mixture screw down until the screw slot was gone.

014 (2).JPG

[Homer]

Next I centrepunched the newly ground end. Its important to get the mark as close to the centre as possible.

023 (2).JPG

Then I drilled about 4-5mm deep hole with a 3mm drill bit, You can see its not perfectly in the middle, but its close enough not to be a problem.

024 (2).JPG

Next I got a 3/16 inch by 2 inch brass countersunk bolt.

025.JPG

[Homer]

Then I ground the last 5mm of the bolt down until it fits into the hole drilled into the mixture screw.

026.JPG

029 (2).JPG

Then drill a 5mm hole in the stainless nut, and put a nut and some loctite on it to keep it from turning on the bolt.
Soft solder the mixture screw and 3/16" bolt together. Its important to get the bolt and screw as straight as possible while the solder is still soft. It took me three or four goes to get it straight.

031.JPG

[Homer]

As you can see, once their back on the carby, they're easily accessible for adjusting.

033.JPG

Job done, its beer o'clock!

[schmiffee]

If this works as you say and as easy as you imply...you're a freak!!

[Mincehead]

Nice little mod Homer.

[Con Rod]

Very handy mod indeed.

Did anybody ever come accross anywhere you can buy an easily adjustable fuel screw for the standard TRX carbs?

I have seen a few for the Keihin FCRs but not for the standard Mikunis

[Homer]

Don't think you can mate, thats why I made the ones I did.

[Con Rod]

yup, I may have to go that route but was hoping for the lazy option

[Dav]

Ages ago when I had my DR motard I bought an extended screw for the Mikuni carb from keintech:
http://www.kientech.com/ExtendedFuelScrews.htm
They might be able to help or know somewhere that can

[Con Rod]

Decided to follow Homer's example and make my own fuel screw adjusters

started with some brass all thread

1 a.JPG

Which I then filed down to size and put a notch on the end. Also flatted out the other end so I could turn them

1.JPG

Then I soldered that to the back of the fuel screw (was not finished at the point I took the photo but you get the idea)

1c.JPG

[Con Rod]

then screwed them back into the carbs and bobs your uncle

4.JPG

3a.JPG

6.JPG

[Rod.s]

then screwed them back into the carbs and bobs your uncle

4.JPG

3a.JPG

6.JPG

So the carb kits turned up ok Well done looks just like a bought one

[Con Rod]

yepo, turned up, all looks good, very happy with them. Fuel screws fit!. Will refresh the rest of the carbs at the weekend maybe