Carburetor screws glued??

[Old Rider]

Here are pictures of the hoses

[racerrad8]

That is not anything that Yamaha ever used. It looks like some sort of vacuum drawn fuel enrichment system. It appears it is pulling fuel from the bottom of the bowls. The air flow at the air box must draw the additional fuel into the mouth of the carbs.

Is there a tube hanging don in the air box?

I would be interested to see more of the screws in the float bowls as well as the underside of the adjustable fitting on the air box.

Here is what the Yamaha float bowl screw looks like.

Randy - RPM

[Pat Conlon]

I've never seen anything like that....

At least the bowl fittings and drain tubes would be a good idea for a drain system for storage.

{edit} OK, now I remember....that kit is called Dial-a-Jet: http://thunderproducts.com/dial-a-jet-automatic-fuel-induction-system/
I recall reading about this back in the mid 90's. The consensus was that it was not an optimum solution. The ability to rejet the pilots/needles/mains for specific low, mid and high end range was much more accurate.

This kit was marketed towards folks who did not want to open their carbs and change their jets. 

My advice to the Old Rider is to remove this kit, plug the holes, reinstall the float bowl drain screws (or as I said above keep the lines for a easily accessible drain system) and rejet your carbs properly.

[jscgdunn]

These are great JIS screwdrivers:

[oldktmdude]

These are great JIS screwdrivers:

Bought a set about 6 weeks ago. Great screwdrivers, should of had them years ago. 

[giantkiller]

These are great JIS screwdrivers:

Bought a set about 6 weeks ago. Great screwdrivers, should of had them years ago. 

Where does one find this set?

[jscgdunn]

I was fortunate to find them at Princess Auto... I actually bought six sets and gave them as Xmas presents!

Look like online here:

http://www.vesseltools.com/hand-tools/screwdrivers/view-all-products.html

[aviationfred]

You can also find Vessel JIS screw drivers on eBay.


http://www.ebay.com/itm/Vessel-700-KIT-P123-JIS-3-PC-Cushion-Gel-Handle-Cross-Tip-Screwdriver-Set-/302030556224?hash=item46526c8c40:g:HS4AAOxyY9VRSCcT&item=302030556224&vxp=mtr


Fred

[Old Rider]

That is not anything that Yamaha ever used. It looks like some sort of vacuum drawn fuel enrichment system. It appears it is pulling fuel from the bottom of the bowls. The air flow at the air box must draw the additional fuel into the mouth of the carbs.

Is there a tube hanging don in the air box?

I would be interested to see more of the screws in the float bowls as well as the underside of the adjustable fitting on the air box.

Here is what the Yamaha float bowl screw looks like.

Randy - RPM

Hi again i forgot to take pictures innside the airinntake ducts but there was a brass pipe going into the airinntake like a nossle in the end.
Todat i have replaced the carburettors and guess what it dosent start.It cranks over fast and it has spark on the plugs.The plugs was dry.
There is fuel in the carburettorbowels. I tryed spraying some carbcleaner into airfilterbox and then it fires but stops again.What can i do now??
as mentioned earlier the starnge hoses that goes from drainscrew on the carburettor and up and into the small boxes on top og airboxinntake rubbers.
I have troble to remember what order the hoses was connected.I marked 2 of then but the ink on the tape i used got off from fuelspill.
Do you think its crucial to make those hoses right placed??.Now i just conected hose from carburetor 4 to airboxinntake 4 and so on.

[Charlie-brm]

I was fortunate to find them at Princess Auto... I actually bought six sets and gave them as Xmas presents!

Look like online here:

http://www.vesseltools.com/hand-tools/screwdrivers/view-all-products.html

Over about five years of people online, mostly living in Ontario, saying they found Vessel brand on sale at Princess Auto, I've never seen them in the stores at any price and I go to three or four locations regularly.
And why they are not in the flyers when they are on sale or tagged on the shelf as a special item is a mystery to me. Not that things being a mystery to me is something new.

In the meantime this summer I was rummaging my drawer of way too many 1/4" shank bits and a few of the cheapest sets I have pushed to the back include ones marked PH and a bunch marked JIS, so I've had them available all this time. Probably not as good as dedicated name brand drivers. The Impacta design is a good idea. I have a mini impact holder for 1/4" bits, the size of a magic marker. Great for getting master cylinder flush screws started.

Here is a source for a set of JIS screwdrivers in London, Ontario at a reasonable price. Nice guy running a small operation. http://www.gofastinnovations.com/jisscrewdrivers.html

[Old Rider]

A quick uppdate everything is fine now the engine runs smooth and with good power.Guess i have been lucky and dont need a carbrebuild this time.

[Pat Conlon]

Carb rebuild no, carb cleaning yes.

Good for you.