First time taking apart Carburetors (Lots of pics)

if you need any help let me know. i am a motorcycle technician certified thru honda and bmw. my shop number is 540-899-9465 hell on wheels inc. i have had alot of experience cleaning old bike carbs and unless you have a carb tank you will not be able to get them clean as i can. you can mail them to me and i will rebuild them for $200 plus parts and shipping . my address is 33 mcwhirt loop suite 110 fredericksburg va 22406 my email is hellonwheels1984@gmail.com Also, I am a 1984 AMI graduate. I specialize in restoring old bikes here. It is a nice feeling seeing old bikes on the road. I used to work at RHODES CYCLES IN MORGAN CITY LA my boss ordered alot of the non current yamahas backed then and everyone of them had to have a carb clean and tank derusted and cleaned i.e 400 550 650 750 and 900 secas maxium,viragos and fjs . Did you make sure the starter jet was cleaned for the fuel enrichment system if not, your choke will not get any fuel. My website is www.hellonwheelsinc.com I quarantee all of my work. thanks chris ferguson

 

If you don't have restrictors in the lines, you're probably sucking some of the tranny fluid into the intake. that'll cause smoke like that. I have seen several people make various types of vacuum gauges, but still find that the Margan CarbTune works best and easiest.

As far as balancing......As you found out, you balance 3 with 4, and you balance 1 with 2. You do the SAME thing with 2 and 3, but look at it this way.....you're balancing the left half with the right half. So, its 1-2 and 3-4. It is "a balancing act", and you DO have to play games with the 1/2 and 3/4 combinations AS WELL AS the idle speed screw.

We all go through that to some degree or another, and I usually double-check things, too, so do it even more. But, as time goes on and you gain experience, you'll find it's actually pretty easy and quick.

Dave Fox

 

Thanks everyone. I realize asking about the mufflers was a silly question, so I re-synced with the mufflers and airbox.

Then I took off the airbox and put the pods on, and synced again.

All is well!

 

BrosefStalin,
I have enjoyed reading your post as i am getting ready to start a 1985 XJ700N Hitachi HSC 33 rebuild and have no mechanical experience. Your photos and diagrams rock. I just came across this as i got my gas tank off and got stuck even removing the carbs themselves. I tried removing them with an allan wrench on the front but think that is incorrect as i can't get to them.

Any lessons learned getting them off would be helpful.

I am documenting my lessons learned and saving it here: https://drive.google.com/file/d/0BxC5vLEYBMOyZHQ5OTNKTnVxajQ/view?usp=sharing
Thanks,
-Brett

 

Brett, you look awfully young to be taking on a set of carbs, but that's ok there are a lot of kind, patient and smart folk here to help you.

It is recommended that you start your own thread with questions as you move through the complete refurbish process.
Mimic what Brosef did (you don't necessarily need to post everything) but do as he did, lots of pics, sketches, etc. to remind you how it was before you took it apart.

For removal, as you speak of Allen wrench I assume you were trying to remove the carb boots on the engine side. (Note my experience is with an 81 XJ650 Maxim and may not match your situation). First loosen up the 'hose clamps' on both intake and exhaust carb boots; now loosen your air box and slide it back as far as you can, remove boots from air box to carbs, now get yourself a hammer handle (or similar piece of wood) and use that to carefully pry/ wiggle the carb rack off of the engine side boots. (You did disconnect all of your linkage and hoses first right?). Many find it easiest to straddle the bike while doing this.

Here, read through this: http://xjbikes.com/forums/threads/in-the-church-of-clean.14692/
Now start a new thread.

 

After you loosen the ring clamps, push the airbox - to - carb boots back into the airbox for additional clearance in addition to loosening the box itself and pushing that back

 

Hey everyone! It's been a while, I've been busy wrenching and riding but I hope all of my fellow XJ'ers are doing well.

I'm having some carb difficulty...but mainly just syncing issues. I went ahead and bought a 4 gauge carb sync tool to make my life easier earlier this spring, and I noticed that when synced, the bike runs like a dream, but it seems that the carbs keep losing their sync very shortly after I sync them ( a few rides) and I have to re-sync them every couple of weeks (based on what my gauges are telling me).

Any idea what could be causing this? I just went through and measured my valve clearances. which are all in spec so I'm quite stuck on this one.

I've also checked with propane for vacuum leaks and im not seeing/hearing any.

Thanks guys and gals!

 

I really like your pictures this thread might be an older thread , but your pictures are great. As for your synch issue hmm what is the highest reading out of the 4 carbs ? I know on my 750 it seems to like 5 HG best all even , your float height might be off ever so slightly perhaps causing a "hunt" in the synch. What symptoms are you having that your having to recheck it? Is it making any popping out the exhaust ? Feeling of running uneven? Wow sound like a doctor since they only "practice" medicine LOl

 

Please start your own thread.

 

This is his (BrosefStalin's) thread.

Gary H.

 

Under each sync screw are two springs , they're slightly different and it matters where they are.
I don't remember how they go but someone does.

 

Does your bike have the yics system?

 

oops.