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Carbtune help please!

  • Thread starter Thread starter MellowMoodz
  • Start date Start date
M

MellowMoodz

Guest
Okay folks, have had the bike for two years now and here is a list of fixes/upgrades:

New Petcock
New Tires
New Carb Boot O-Rings

Maintenance I have done in the past few weeks:

Carb disassemble and DIP with New Robert Barr O-Rings
Valve's Adjusted
New exhaust Gaskets
Clean and Re-Oil Air Filter
New Progressive fork springs and spacer
New MIDI rear shocks
Oil Change and Filter W/O-Ring
New Turn Signals
Carbs Bench Sync'd

Now here is the issue i'm having....

Everything is back together running and ideling. If you snap the throttle it bogs and wants to die, catches and revs fine after that. I figure carb sync (from doing searches). My carbtune came in last week and i got the flu. So....yesterday i try and sync my carbs. Carbtune all hooked up engine warm and ideling......no readings on the Carbtune......None.....What am i doing wrong? HELP!!?!?!?!?!?!?
 
Set your idle at about 2000-2200 RPM to sync. After you are finished adjusting your carbs, turn the idle back down to factory specs.
Also sounds like you have some jetting issues as well.
 
Check your pilot jets (make sure they are clean) and that circuit as that takes care of the roll off into the main power range.
 
you can hang the morgan carbtune upside down to get a better reading on it. I have only balanced two 4-stroke snowmobiles with it hanging with the hoses on top, all the other times it hangs with the hoses on the bottom.
 
Did you put the restricter clear tubes into the black tubes that came with the kit?

Hang it on the left handle bar so when you adjust it you can see the readings clearly.
 
duheme said:
you can hang the morgan carbtune upside down to get a better reading on it. I have only balanced two 4-stroke snowmobiles with it hanging with the hoses on top, all the other times it hangs with the hoses on the bottom.
Click to expand...

Anybody else try a sync on a 650? Did you have to hang it upside down?

GQROD said:
Did you put the restricter clear tubes into the black tubes that came with the kit?

Hang it on the left handle bar so when you adjust it you can see the readings clearly.
Click to expand...

Restricters are in and it is hanging on the left handle bar....

zathros said:
Check your pilot jets (make sure they are clean) and that circuit as that takes care of the roll off into the main power range.
Click to expand...

The pilot jet plug on carb one was REALLY loose when i installed it, i haven't pulled the carbs again since i tried syncing. If it fell out could this be the problem?

Thanks for all the help guys, i'll get this figured out yet....
 
Sync

Sync

If you've got it hooked up correctly, I can't imagine how it's possible that you get no readings. In any case, I don't think the problem you're having with your engine has anything to do with the carbs being out of sync (even though they probably are).
 
MellowMoodz said:
So....yesterday i try and sync my carbs. Carbtune all hooked up engine warm and ideling......no readings on the Carbtune......None.....What am i doing wrong? HELP!!?!?!?!?!?!?
Click to expand...

Check & make sure there is vaccum from each line feeding the Carbtune - pull the line off each port & place your finger over it. You should feel suction. Start at the vaccum ports on each intake boot & work your way back to the Carbtune.

Just a random thought - the intake boots with the vaccum ports are on the "engine" side of the carbs, right??

Perhaps the little hole through the clear restrictors are clogged or missing??

good luck
 
Also, pull the vaccum line off the petcock & plug it - run the petcock on PRI if using the bike tank for fuel.
 
I just synced a GS650 last week with a Carbtune, and it worked perfectly normally.

Something must be wrong with the way the Carbtune is set up or connected.

Also, please keep in mind that it needs to be pretty close to vertical. Sometimes the rods can get hung up if it's hanging at much of an angle.
 
Start by sucking on the hoses to the Carbtune....Does it respond then?
 
When I got my carbtune delivered, first time using it, #3 rod did not move but the other three worked ok. Turned out just that rod on #3 was stuck in the base of the unit and could not move. I assumed it got that way through shipping but who knows. Was a right bugger to get loose anyway.

Just check they are all free to move like has been suggested already.
 
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