Thanks Auke ,,

I have my work cut out for me. I'll have to tackle it over the weekend. I was also wondering about the electrical conections, I'll go through them also.

Thanks Randy

Hey Vando ,

My Grand Parents on my Fathers side are from Portugal ,, my grand mother is from Fial and my grand father from St. Micheal .

My grand mother from my mothers side is from there also ,, don't know where though , I think Maderia , not positive though .. My mothers father ,,,,,, well he was a frenchman . ..

So I'm 3/4 Portuguese

Randy

Hey Randy!

really?
That's cool!
São Miguel and Faial are really good islands to travel backpacking!

Have you ever been around here?

Oh, and most of my family on my mother's side is all living in Hudson MA(close to Boston, Fitchburg, Worcester)
Where you from in MA?

It's been two years in January since I was last there :\ been there maybe 12-14 times already.. I absolutely love it there!


I was going for a trip to all the Azores islands with a girlfriend this summer in my XT600E but the bike wasn't finished yet and she had to leave very early..
We did manage to go backpacking to São Miguel for a few days..

Vando

Vando ,,, Wow it is a Small World ,,

I live in New Bedford , MA. I live at the begining of Cape Cod . My city is Known for its huge seafood industry . It used to be a big Whaling City back in the day. I'm 1 3/4 hours from Fitchburg. My brother lives in Lunenburg , MA. He's a town over from Fitchburg.


I've never made it to the homeland of my family .. I'd love to go to Azores/Portugal .
I don't know where to go there and 1st I need to learn to speak it alot better. I've heard it's beautiful there.

Randy

I actually have a good friend who moved from worcester to cape cop..
She even invited me to go over there next time I'm in the US and I said: sure, if you introduce me to your girlfriends! lol which will hopefully be next summer!

yeah, it's about 1 1/2h drive on the 495 south from hudson to the capes..

Well, you should visit everything here! all the islands! All of them have awesome places! well, except Corvo.. it's got a main street going up and down the island lol about 300 - 350 people live there..

And if you love backpacking and camping as much as I do you will love every single moment you're here!

Portuguese is pretty much the same as spanish...tho most people here do speak english!


Vando

Did you check to see if the carb mounting rubbers were still fully attached to the aluminum parts? Leakage will affect your mixture. Mine looked OK but werent. I used gorilla glue to put them together and all has been well for several years now. I had problems getting through emissions and rough running.

Good Luck! Steve

Thanks Steve ,, I bought brand new ones already and they're on there .

Randy

Thanks Vando, I'll have to have a sit down with the wife and see if we can fit it in our budget to vactaion there... Next time your heading this way give me a heads up we can get together. I currently have a couple of ATVS we can go riding on , also if the XT is straightened out and on the road , you can take that and I'll take my Harley and I'll take you on a tour of the Newport , R.I. mansions and water front .. breath taking (both scenery and the women in the summer time around there), bring a camera.

Randy

do you have a cdi from the parts bike? If so swap it out. they are known to go bad.

I took some discs out from the super trapp , I'm down to 4 discs Wow what a difference .. it smoothed right out no more popping in to the carb. Still a little lean though .

So I already have a new 135 main jet , i'm going to put in it. theres a 130 in it now . stock was a 125. the pilot jet is 46 , I think I'm going to go up to the next size on that also .

It's deffinalty a carb / air flow issue . it'll now idle no problem . but while riding you let off the throttle , the RPMS hang up there for a little bit before dropping , which tells me it's still a little lean.

I'm getting closer to dialing it in.

Randy

Hanging rpms has nothing to do with the mainjet, thats for wide open throttle.

Go one up in idlejet, or try to adjust the CO screw out a bit further.

usually, the hanging rpms means an air leak somewhere in the air system...

Are you sure you're that you've fitted the carbs right in the carb boots and it's not the clamps holding it in place?!?!

So, what was the final word on the fix? (I assume you must have started riding again and forgot to post your solution, lol)

I have a very similar problem, its running super lean and popping on decel and dying sometimes when it pops usually when shifting down. I had to get a new air filter (UNI) and the previous owner in his infinite wisdom gutted the muffler. So obviously I'm getting a ton of air in and no back-pressure out. It currently has a 130 main jet and kicks over fine but runs lean. The air mix screw is out 4 -5 turns and it dies if i put it in under 2. How'd that 135 work?

I went through the checklist mentioned earlier in the mix and no leaks in the boots or intake tubes. I started stock with everything and it would barely run. Anyone ever make their own baffle setup to replace a rusted/damaged stock one? I dont have a supper trap and so it isnt as easy as just removing a few baffles. I do have a welder though!

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Perpetually fixing an XT600 as old as I am...

I recently was having issues with my 1984 XT600 (LC) dying at highway speeds. If I let off the throttle and tried to cruise at 55mph it would sputter and die. After a weekend of troubleshooting I found out my XT600 had a black screw in valve under the tank. OK, so California models suck. Literally, the clogged "roll over valve" was causing a hardcore vacuum in the tank and making gas and air evacuate the carb bowl and travel backwards up the fuel line. This "roll over valve" is listed as #26 on this diagram:
1984 Yamaha XT600 (CA) XT600LC Parts, 1984 Yamaha XT600 (CA) XT600LC OEM Parts - BikeBandit.com

The previous owner just removed the canister and plugged a long piece of fuel line from the broken roll over valve to a nipple on the carb just above the fuel line nipple. I just removed the roll over valve and it will just act like a vented tank now I'll eventually try to put a one way valve on there like they sell for MX bikes to let air in but no gas fumes out. in the winter when I store it I will WD40 the empty tank or fill it with gas and add stabil to prevent rust from condensation.

The scoot will run with that nipple on the carb plugged or unplugged. It just makes a sucking noise like "ffuff fuff ffuff" as you go down the road. This leads me to believe that dirt could get sucked into my carb bowl... so I'm going to cap it off. pretty sure thats a safe bet as the parts fiche doesn't even show the nipple on the carb.

So if you have stumbling issues at highway speeds make sure its not due to crappy California emissions gear that is faulty/improperly removed. I made sure this fix was repeatable and sound advice. I put the parts back on and the fuel line to connect them and it caused stumbling EVERY TIME. Take it off and it stopped acting up EVERY TIME. Also make sure you're not lean due to your airbox snorkel coming off under your seat as I'm sure that was not helping the troubleshooting process.

Just thought I'd share since I was sooooooo pissed off at it this weekend and there wasn't a ton of California Emissions stuff linked to sputtering out at speeds. And I know the roll over valve was bad because air could not be sucked or blown through it and if tapped on a hard surface debris would come out of it.

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Perpetually fixing an XT600 as old as I am...