How to replace the emulsion tubes on a Mk1

[Studley Ramrod]

Being as my old wans will prolly be buried under less crap than you old wans, I'll go have a look.

 

Okeedokee, all the Mikuni toobs have the prefix number 611.

 

1991-1995 Mk1 and XTZ are Y-4

1996-1998 Mk2 and TRX are Y-2

 

Are you aware of the Factory Pro toobs ?  They nickel plate theirs and reckon they won't wear for many thousands of miles.  Unfortunately, they're based in the USA and it costs a small fortune for us in the UK to buy them.  Just thought I'd mention it as it might be an option for you to try this method.

[dapleb]

Thank you SR. It would have been a mission. :0)



Have had FP toobs in for nearly 50,000 miles and none of the worn toob symptoms yet. I did get a quote for another carpe batch from them but then forgot to order and the price will have advanced a great deal since then with the exchange rate n'all.

[dablik]

That would be a good idea to nickasil plate them, i would like a set but refuse to pay them horrendous prices in the US

[Studley Ramrod]

Sorry, they are Nickel plated, not Nickasil.

[maelstrom]

Thanks gents. The Y4 is 3.12mm and the Y2 is 3.11.

If anyone wants to partake in medical experiments let me know.

Cheers

Blair

[Mxroost]

Hello folks. Need some help here with my carbs on my 92 TDM. Im restoring it and it only has 10k miles on it but it sat in storage for 29 years. Anyways I rebuilt the carbs among alotta other systems of the bike and got it to run. Problem is as you can see in the attached video it runs crappy from right off idle to about 3k rpms. Youll note that the left slide doesntlift like the right one. I checked the diaphragm (both are replaced with new ones) and no holes or tears in it. You cant see it in the video but the fuel coming up from the emulsion tube doesnt seem to have the same amount of fuel flow that the right one has . Also the left intake port is varnished up and the right one is clean as a whistle (indicating this problem existed when put into storage). Do you all think I may have emulsion tube issues? As I said i rebuilt the carbs which was replacing pilot jets,all o-rings and gaskets,float valves,diaphragms, etc,. Can anybody here hook a brotha up?🥴Thanks (sorry, I cantattach the video. Ill blame my own eneptness and not my iPhone)

This post was last modified: 04-11-2023, 09:54 PM by Mxroost.

[Studley Ramrod]

Hi.  You might need to adjust the pilot screws and balance the carbs.  That said, it may be that the carbs would benefit from an ultrasonic clean.  Difficult to know really.

 

Also, did you inspect the choke plungers ?