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550 only runs with spray bottle into carbs

  • Thread starter Thread starter Chuck Fryer
  • Start date Start date
C

Chuck Fryer

Guest
Hello-

I'm working on a new to me 82 550L. I bought it non running, and can only get it to start using a plastic spray bottle into each carb. I took the rack off, disassembled and cleaned them all. Cleaned in an ultrasonic machine. I put them back together, new orings and a bench synch. I did have to change pilot, main, air and needle valves back to factory #'s. Any idea what to look at as to why it won't fire up? I do have gas in float bowls.

Thanks
Chuck
 
Did you follow the carb rebuild tutorial to the letter? (linked in my signature)

Is the airbox installed and is the bike stock?
 
I didn't follow the tutorial, but I will read it. As far as I know it is stock, with airbox still on bench.
 
Put your hand over the backs of one or two of the carbs and see if it fires up. If it does, then it needs the airbox installed.
 
I'm not sure I understand your laugh. I had a 79 Yamaha xs750 that used 3 of these cv carbs. It would start run & idle without airbox
 
im sure it did. Just think refusal to consider a valid opinion offered as a result of a question you asked is hillarious.
Try the airbox how painful could it be.
 
I was not trying to be and don't think I was being disrespectful. I am just trying to get it running before I spend more money. I am here because I don't know all there is to know about these machines. Now, the airbox....the reason it is not in is simple, it does not fit my carb rack. The spacing between #2 & #$ carb s is wider on my carbs than the spacing on the airbox. So, I will need a different box or build a custom plate to mate the two. Thanks for the hand over the inlet suggestion, that was helpful.
 
not sure how vacuum impacts the airbox and filter and metering of fuel. Theres a few articles and posts on here admonishing folks and insisting on box and filter. I know mune wont run without it.

A 750 is 250 ccs volume per jug a 550 far less.

Youve already proven it runs with a spray
 
I had an FZ250 (4 cyl) that would not want to start without the airbox. The thing was, you had to have the airbox off to get to the carbs to sync them.

I had to cover up the inlets to coax fuel into the cylinders. It would run after that but would not start with the airbox off.
 
Chuck Fryer said:
I was not trying to be and don't think I was being disrespectful. I am just trying to get it running before I spend more money. I am here because I don't know all there is to know about these machines. Now, the airbox....the reason it is not in is simple, it does not fit my carb rack. The spacing between #2 & #$ carb s is wider on my carbs than the spacing on the airbox. So, I will need a different box or build a custom plate to mate the two. Thanks for the hand over the inlet suggestion, that was helpful.
Click to expand...

Are you using non stock carbs? Why doesn't the airbox fit?
 
Well.... I'm trying. It came with a set that had frozen pilot jets. I bought a nice set off eBay, but they are spaced slightly wider, only about 1/4", and they were jetted way fat.
 
No such thing as 550 carbs with different spacing. You got something else. That's likely part of the problem. Getting out stripped jets is doable.
 
They are mikuni 32bs cv carbs with correct 82 550 jetting and settings.
 
They may have "correct 82 550 jetting and settings", but if they are spaced incorrectly, you WILL have problems.

For one other suggestion, try folding a shop rag in half, then holding it over the carb openings. If you clamp the rag on the two outer carbs, you can actually do a trip around the block, but it's not good enough to check the jetting. These carbs rely on smooth airflow into the throats. You should be able to start and idle the bike with no airbox, but you will have a hard time getting to anything higher than idle speed without SOMETHING over the carb throats to smoothe the airflow.

.
 
I was able to get it to start with my hand over two carb throats, thanks! I'll post pictures of the difference between them later today.
 
There is more to the jetting than just the main & pilot. There are various air jets, needle sizes, jet needles, etc. Look at the OEM carb jetting sticky thread pinned at the top of the forum and see for yourself. Compare the 550 and 650 carbs for example, both as the same size and have the same spacing, but the jetting is quite different.
 
Nessism said:
Compare the 550 and 650 carbs for example, both as the same size and have the same spacing, but the jetting is quite different.
Click to expand...

Jetting can also change from year to year. Not so much because the bikes changed, but because Suzuki had to rush to meet the new EPA standards and set everything rather lean. In the following years, they learned that they could change this air jet or that pilot jet and get a better-running bike that still met the standards. Best suggestion would be to find the jetting for the latest year of that model, maybe even compare that to the jetting of the Canadian version.

.
 
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