Need a little input from my tech guys and gals

[jakemiller93]

I have a 97 tour classic. I've cleaned the carbs RELIGIOUSLY. Four times now. I have the bike running, but when it idles, gas pours from the overflow tube. At high RPMs, it stops leaking. I was able to seemingly relieve it for a time as it didn't leak, but it's back now. I tried a seafoam soak for 48 hours, no progress. I'm planning on taking them apart and cleaning them really well again. All jets have been clear, float needle moves freely. Am I looking for an o ring or a seal? Diaphragms look brand new and needles seem to move freely. I'm just gonna clean it all again, piece by piece and see what happens, but if you can tell me what to keep and eye out for, I'd really appreciate it. Thanks!

[RedRider]

Jake,

 

I suspect your bowl floats are not adjusted properly. Fairly common with the second gen's and I assume the same issue with the RSTD.

 

Search the site for the procedure to set them correctly. Kind of a pain, but not hard.

 

Good luck.

 

RR

[M61A1MECH]

Here is link to setting the floats on the Venture 32mm carbs, the process for the 28mm carbs on the original Royal Stars may be similar.

 

https://www.venturerider.org/forum/showthread.php?24246-Set-the-Float-Levels-on-QuickSilver

 

Check the needles and seats for wear or damage. Most leaking from the overflow tubes is caused by debris or varnish on those needles and seats.

[BlueSky]

Are the needles and seats from Japan? or china?

[MiCarl]

There are a number of things that can cause your problem.

 

When you have the carbs off remove the float bowls and invert the rack. Get a spray bottle of soapy water and a length of hose that will fit the fuel inlet snugly. Attach the hose to the inlet and blow into the other end while spraying the underside of the carburetor bodies with soapy water. Watch for bubbles, which will indicate the location of the leak. The leak can be at a flat needle, where the needle seat seals to the carb body or even a cracked body.

 

If you don't find a leak you need to look at the floats themselves for fuel saturation, mis-adjustment or hanging up on something when the bowl is installed.

[cowpuc]

I have a 97 tour classic. I've cleaned the carbs RELIGIOUSLY. Four times now. I have the bike running, but when it idles, gas pours from the overflow tube. At high RPMs, it stops leaking. I was able to seemingly relieve it for a time as it didn't leak, but it's back now. I tried a seafoam soak for 48 hours, no progress. I'm planning on taking them apart and cleaning them really well again. All jets have been clear, float needle moves freely. Am I looking for an o ring or a seal? Diaphragms look brand new and needles seem to move freely. I'm just gonna clean it all again, piece by piece and see what happens, but if you can tell me what to keep and eye out for, I'd really appreciate it. Thanks!

 

Got some great advice happening IMHO but sitting up here in the, I have never worked on a 97 tour classic, peanut gallery - I am a little confused Jake. Mind if I shoot a couple questions past you? If not and you keep on rwieading here,, please understand that the following is strickly from a varmint whose only real experience with the Yam V-4's is with the 83 's..

You mention your base problem with the scoot is over fueling resulting in over flow from at least one carb bowl - correct? Then you lead on with the statement that the diaphrams look brand new and the needles seem to move freely.. My first question is,, are you referring to the slide diaphrams or are the float needle and seats in the carb float bowls that act as a fuel control valve operated by a diaphram? If so,, this is absolutely not like a MK1.. On the other hand,, if you are referring to the diaphrams that are attached to the slides in the carbs that have the mainjet fuel metering needle hanging from them,, please note that (at least in my limited experience in dealing with carbs) those needles are actually jet metering needles that only control the amount of fuel passing thru the main jet and have nothing to do with fuel over flow coming from the float bowl..

Concerning what I would do if one of my carbs on my 83 suddenly decided it was going to pass fuel out of an overflow. The first thing I would do is identify which carb(s) had the issue.. The next thing I would do is drain that carb and refill while tapping on the bowl with the handle of a screw driver - often times, at least in my expericence, this will dislodge a stuck float and/or debris from the needle and seat valve.. Another thing I have successfully done if the latter did not help was/is draining the carb, refilling the carb thru the drain with carb cleaner from a large syringe until it the cleaner flows from the mainjet into the throat of the carb - let it soak a bit - open the drain and agitate with the syringe and suck it out.. Then refill with fuel and see if that dislodges the issue.. If I have to physically open the carb up,, I open up all the carbs and redo them.. Murphy has taught me that he likes to play the old "I'll break this one first and another one 2000 miles down the road when you dont have your tools with you and you are camped out in the middle of nowhere" game with me.. Having faced that issue,, please note that some carbs are sealed on the float valve at the seat with an o-ring and NOT a compression washer.. Some valve seats are actually pressed into the carb body and are fit with an o-ring that sits in a groove and the valve seat.. Make sense? That being so,, it is not totally uncommon for those o-rings to loose integrety and allow fuel to bypass the valve and enter bowl uncontrolled and end up flowing out of the overflow hose(s)..

 

Is any of that making any sense? If not,, dont be afraid to say "Puc,, you lost me back at line one" cause I am old and tired..

[jakemiller93]

Dang, you guys are awesome! You definitely don't disappoint! Thank you all for this input. I'm gonna take all of this and get to work. I'll be sure to update once I find what it was. And cowpuc, that was a REALLY finely detailed explanation that even a simple country boy like me can understand! I really appreciate all of you guys. I'm grateful to have a place like this that I can ask the experts. Y'all are the best.

[jakemiller93]

Are the needles and seats from Japan? or china?

I'm not sure as these carbs were purchased 6 years ago off ebay. Is there an identifier I can look for to find out?