Already run out of ideas and loosing confidence on the bike.

Quick question, if the floats levels are too high o not shutting off, Should be a leak from the carb. bowl? specially when the petcock is in "pri" position. Because i have no leak at all with the bike running or not, and the petcock in "pri" pos.

 

Article: Clean your own carbs - the Whole 9 yards by Rick Massey is the only item in the XJ FAQ Final:

http://www.xjbikes.com/Forums/viewtopic/t=2908.html

 

Not necessarily. It could just be dumping down the intake throat.

While you can CHECK the float levels with the carbs on the bike, it isn't very easy to do. You need to ensure the bike is level from side to side and prop up the front so the carbs are level front to back.

And since any ADJUSTMENT will require pulling them off, it's just easier to have them off to begin with.

 

Re: Already run out of ideas and loosing confidence on the b

schmuckaholic has a write up on doing the float level adjustment at XJ4Ever.com

If he changed the pilot jets then your pilot mixture screws will also need to be adjusted.

 

Hi Tskaz, I don't know if he changed the pilot mixture screws what I know is he change the pilot jets back to spec. Before there were 120 and 50, so I found the closest ones... 107 and 40 (instead of 36.5).
He also did the test with a vacuumeter(I'm not sure that's the word!)

 

Manometer ...

 

Wow sounds like your mechanic has got you all turned around...
40s instead of 36.5?? Thats a big jump.... Now you gotta shim the needles, bigger main jet to accommodate. Fun
Try listening to these guys. Theyve been doing it forever.
Clean your own carbs. Talk to chacal. Get the right jets and double check diaphram needles. Set your float heights. Get new Mixture jets and set them to 2 1/2 turns out.
Bench sync
Colortune
Sync
Ride
-Chris

 

Sounds easy... #40's is the only ones I can get in this part of the globe. Thing is that is not that easy for me send a pm to chacal and get me the parts I need since I'm not living in the US no more! Anyway I'm pretty sure this guy made the adjustment needed since the bike run pretty darn good for about 3 weeks. That's why I'll focus in the valve gap first, then the floats levels, besides I don't know what a "colortune" is, and of course I don't know what you mean by 2 1/2 turns out (I didn't have the time to check on the manual about the mixture jets) but like I said I don't think that should be the problem because when those things are off they are off from the begining and not 3 weeks later (I guess!!) I let you know how I'm doing, since tonight I'm gonna download all the information collected, tomorrow I'll start working... thanks

 

Are new mixture jets available and is 2.5 turns out the best place to begin when tuning them?

 

Indeed. That puts you at an excellent "starting point"

Rob, you might want to consider an In line Fuel filter as well.
What could have happened after the 3 weeks of excellent running, something from the tank slipped past the float needle and into the carbs. Or B: your mechanic missed something. Look it up. Do it yourself. Save yourself money and learn a thing or two. You have all your resources right here at your fingertips on this site
-Chris

 

Thank you Chris... Sure he missed something...and sure I'll learn more than a thing or two a lot more. Let me ask you, What is that you call a In line fuel filter? I mean It has some special shape?. I had the original one, wich I replaced by a small car model because I wasn't sure about the flow, plus this one I got now is all clear so I can see the gas inside and also replaced the black fuel hoses as well for clear ones, so again I can see if there were any gas flowing to the carbs, but I never here a In line fuel filter.

 

You've completely ignored what more than one of us have told you more than once:

CHECK YOUR VALVE CLEARANCES.

If you ever get this bike running you'll need to do it again in 5000 miles anyway. Might as well learn how. http://xjbikes.com/Forums/viewtopic/t=14827.html As long as you didn't leave an "X" off your bike's model (assuming yours is aircooled) then this will apply to yours too.

You won't be able to adjust the carbs if they're out of spec anyway.

 

Indeed
+1 thanks fitz

 

Not that i didn't read you guys about the valves, I'll check them again before dive in the carbs, What I said is he checked on the valves, I was there when he did it...make no mistake I will do and check anything to avoid to put my hands in those four in-line aliens I mean carbs..
thanks

 

Ok.... checked the valves and were ok, pulled the carbs out, and I blow them with compressed air trough the top hole and I noticed than one of the pinton valves open but doen't close back, I'll dig deeper, I'm taking my time, but I'll keep you up to date...

 

You cant be serious

 

Hey is my first time with carbs ever...I'm serious, "the courtains" is what we call them here, 3 close and 1 remains open every time you blow them.

 

Update...jets size were wrong and since here is hard to find them I had to make new ones out of the big ones, so out of the 50's I got the new ones 37, can't make them 36.5 as per manual...yes, float levels were off too, I thing that's all tomorrow morning I'll put them in and see what happens...

 

Tell you what.....why don't you go back down to the shop (oops, I said the word "s%#$p" again) and tell them that we said they have no clue what they are doing . When they tell you that WE have no idea what we're doing, tell them that there several THOUSAND of us here that DO know what we're doing, and the thousand here are saying that the 'shop' doesn't know what they're doing. Numbers.........we win--we outnumber them, and we have a WHOLE lot more bikes that are running the RIGHT way. Primarily because we PAID ATTENTION to those on the list that KNOW how things should be done.

ENough of the rant:

Now, here's a serious question for you, and please answer it specifically.

"When you (or they) checked the valves.....
HOW and WHAT did you check? Be incredibly specific.
WHAT were your clearance measurements?
WHAT were the sizes of the shims that were in the buckets?
WHAT size shims did you replace them with?
WHERE did you get the shims from?

I find it hard to believe that after all the people that have said to check the valves, and all the times you said you checked the valves, that you did it the correct way. Somethings not right. We haven't seen any specific information on your valves. I hope you're valve check does not consist of "oh, look.....yup, they open and they close, so they must be good'.

I'm not trying to be a jerk (I don't even have to try--I'm quite good at that), I just want to make sure that you're doing it the right way.

Carbs--be careful with that compressed air in the front of the carbs.....you could rupture a diaphragm.

Jets:

Here are the sizes you should have:

Model: XJ700
Fuel main: 107
Fuel Pilot: 36.5
Air Main: 70
Air Pilot: 210

Boots:

Make sure that the airbox-to-carb boots are not leaking air and are tightly sealed to the carbs, and correctly seated in the airbox.

Make sure that the Carb-to-intake boots are not leaking at all, and have no cracks. Make sure they are correctly sealed to the intake, and snug to the carbs with no leaks.

Compression:

What, spedifically, were the compression numbers?

Dave Fox

 

In many cases just start with the valve clearance and super clean and adjust the carbs on the bench. Put them on the bike and sync. It's not that hard just burns up an afternoon.

MN