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82' GS650 Sooo Close!

  • Thread starter Thread starter pancakeshake
  • Start date Start date
P

pancakeshake

Guest
Alright.

We have ANOTHER project bike going.

82 GS 650 L. We bought it running. Brought it home and did a few laps around the neighborhood. Seemed to run pretty decent. We didnt have a key for it so we had to wire up a switch to make it run, which meant we also couldn't get into the gas tank.

After about 20mins on the bike is started sputtering.

So we decided seeing it had been sitting for a while before we bough it, we would clean the carbs and ge into the tank.

- Got the tank open with force, looked good inside'
- Got the carbs off, nice and clean
- Put air through the carbs to make sure they were all free'd up
- Put the carbs back in the bike, new gas, brand new plugs..........bike wouldnt start

We put some starter spray in the heads and the bike fires up immediately, but then dies out quick.

So we determined the gas isnt getting into the heads.

The float bowls are full of gas, so the floats arent stuck or jammed. And all the jets were cleaned.

WHY WHY WHY would there be no gas getting to the engine?
 
Since you've been around for a few months, you must have noticed the carb cleaning lectures along with other stuff. It's a good sign that it ran briefly, be happy, but put away the starter fluid- it can't tell you anything more. Does this bike have an airbox and air fliter box? Any clues to how long it's been waiting for your arrival?
 
Airbox.

We took is out when we took the carbs out to make sure it was nice and clean. It was.

Not sure how long the bike was sitting, but when we went to pick it up the guy fired it up for us and it ran no problem.

So.
-Bowls have plenty of gas
-Petcock works
-Has spark
-Works when gas is out directly in the heads for a brief time
-Choke is smooth and free

-BUT Gas wont make it from the bowls to mix with the air to be sucked into the engine.

WHY?
 
Gummed up choke pick-up tube, gummed up main or pilot jet tubes?
Missing well plugs flooding the engine?

The usual suspects. ;)

Eric
 
Are you using "choke" system correctly? cold start, full "choke" (lever on left switch),NO throttle input, press starter button. This is an enrichment system- draws fuel from bottom of fuel bowl- if this line is reasonably clear, engine should catch.
 
tom203 said:
Are you using "choke" system correctly? cold start, full "choke" (lever on left switch),NO throttle input, press starter button. This is an enrichment system- draws fuel from bottom of fuel bowl- if this line is reasonably clear, engine should catch.
Click to expand...

Yeah we are doing the choke correctly.

does anyone know the minimum float lever for the 650?
 
Pancake, have you downloaded the service manual from Basscliff's site yet? You'll find a lot of the information you're asking for in there.

Also, put your location in your profile and your bike info in your signature (both under User CP) so it's easier to help you out with things.
 
Manual says 22.4mm, + or - 1.0mm

I would put some carb spray threw each hole on the carbs, then blast it with air.
It's possible the air caused something to get stuck? I've had this happen before when I did a "quick" cleaning of my carbs, lol.
 
1_v8_merc said:
It's possible the air caused something to get stuck? I've had this happen before when I did a "quick" cleaning of my carbs, lol.
Click to expand...

Yeah thats what im thinking happened haha.

Where do i measure the float height from?
 
Update:

Pulled the carbs again.

- Took out every single jet, soaked them all in carb cleaner then ran compressed air through them. Nice and clean.
- Cleaned out the gas line with a little gas and air, Nice and clean.
- Adjusted float heights to 22.4mm as said in the manual.
- Made sure the rest of the carbs were clean and ran air through every jet/hole/port I could find.
- Carbs looked great, re-installed them.

- Carbs to carb boots
- Carbs to air box boots
- Gas line to gas line port, big center on on carb.
- Vacuum line from rear of petcock to the 2nd carb's vacuum port
- Choke installed

New gas in tank, petcock on prime, hit starter with choke on....Nothing.

Is there anything else it could be other than carbs?
 
Can you expand on..."Nothing"?

What does that mean? No turning of the starter motor? Turning of the starter motor and no firing in the cylinders?

How long did you leave it on PRIME before attempting to start?
 
BigD_83 said:
Can you expand on..."Nothing"?

What does that mean? No turning of the starter motor? Turning of the starter motor and no firing in the cylinders?

How long did you leave it on PRIME before attempting to start?
Click to expand...

Engine turns awesome, cranks but no firing at all. I left it on prime for about a minute and it didnt start. Then tried it again 20mins later just for the hell of it and still no firing.

Also, the bike has spark in all 4 heads and will start IMMEDIATELY when a little bit of gas is put into each of the heads via. the plug holes. Sounds awesome for 3 seconds, then the gas runs out and it dies.

Im just stumped. The bike used to start great, pulled the carbs and cleaned em, now it doesnt. Hmmmmmm...
 
Forgive me for asking but, are you sure that fuel is getting from the petcock to the carbs?

Eric
 
7981GS said:
Forgive me for asking but, are you sure that fuel is getting from the petcock to the carbs?

Eric
Click to expand...

When I take the carbs off, the float bowls have a good amount of gas in each one of them so I assume so.
 
Why did you just soak the jets? There are passages inside these carbs that you CANNOT see that can be gummed up. Follow the procedures properly, rebuild with new orings, and put them back on. Adjust the valves, make sure the airbox is back on and oiled properly (if you're using pods then make sure the bike is jetted properly for them), and set your mixture screws to 3 turns out to start.
 
pancakeshake said:
When I take the carbs off, the float bowls have a good amount of gas in each one of them so I assume so.
Click to expand...
Next time you attempt to start it, after cranking a bit, pull spark plugs and see if they are dry. Remember not to leave it on prime very long.
 
tom203 said:
Next time you attempt to start it, after cranking a bit, pull spark plugs and see if they are dry. Remember not to leave it on prime very long.
Click to expand...

They were dry. This is why im convinced that the gas isnt making it from the carbs to the engine.

Does the airbox have to be 100% installed and sealed in order for there to be enough suction to get the gas pulled into the engine?
 
pancakeshake said:
They were dry. This is why im convinced that the gas isnt making it from the carbs to the engine.

Does the airbox have to be 100% installed and sealed in order for there to be enough suction to get the gas pulled into the engine?
Click to expand...

Yeah, gas ain't there.
When the throttle plates are closed, there is enough suction to pull fuel up "choke" passages and find it's way to cylinders, BUT, when you "cleaned" carbs and reinstalled them, is the idle stop screw now holding the throttle plates too far open. The plates are just about fully closed when idle stop screw is set ok- orherwise the "choke" system won't work. Bike should at least start with or without airbox.
 
tom203 said:
Yeah, gas ain't there.
When the throttle plates are closed, there is enough suction to pull fuel up "choke" passages and find it's way to cylinders, BUT, when you "cleaned" carbs and reinstalled them, is the idle stop screw now holding the throttle plates too far open. The plates are just about fully closed when idle stop screw is set ok- orherwise the "choke" system won't work. Bike should at least start with or without airbox.
Click to expand...

Butterfly's are very close to being fully closed.

Should I could decrease the idle to make them even more closed?

also...

http://www.motorcycleforum.com/showthread.php?t=102982

Thats my problem right there, and he was saying the air box is a main part of the bike not running right.

Im gonna secure the airbox nice and tight in all places and try that, then if i get nothing, ill play with the idle to decrease the butterfly's opening.

Hope and pray.
 
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