What Have I Done
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What Have I Done - 10/24/2006 4:24:05 PM
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ThisisMickey
Posts: 189
Joined: 7/20/2006
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Hey guys, I tried to syncronize my carbs on my 94 F2 and now it sounds a little louder and when i am stopped if i turn the throttle at all away from me (counterclockwise) it looses RPM's and i havnt killed it but i think it would die if i held it there. Also trying to accelerate the RPM's drop from about 2500 to 1500 and if i dont give it plenty of gas it acts like it wants to die. I am taking it to the shop this thursday. But I was hoping someone could tell me what i did and what I should tell the guys at the shop I want fixed, I really dont want to give them my bike and say fix it because i dont have much money to get all the stuff they think i should fix fixed. I would appreciate any help. Thanks 
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RE: What Have I Done - 10/24/2006 4:58:06 PM
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dwhite645
Posts: 1989
Joined: 1/21/2006
From: OldFatGuy's garage - stealing parts
Status: offline
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Not 100% sure, but it kind of sounds like you adjusted your carbs without the throttle being fully returned to the zero point - not fully closed. Just my guess.
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RE: What Have I Done - 10/24/2006 10:10:45 PM
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Jason748
Posts: 446
Joined: 10/22/2006
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Yep, either the throttle cables are too tight, of the the throttle wasn't fully closed.
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05 CBR600RR - RACE
98 Ducati 748S - Street & Track
60 Ducati 200SS - Fun
89 RM125 - Dirt
Thanks to my 2007 sponsors: Two Brothers Honda, Lithium Motorsports, LockhartPhillips TP, CBR600RR.com
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RE: What Have I Done - 10/25/2006 12:22:37 PM
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ThisisMickey
Posts: 189
Joined: 7/20/2006
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I took off the seat and raised the gas tank, without disconnecting it and while it was running turned the screw between the 2 carbs on the left and tried to listen for a better sound, but it only seemed to change the rpm speed. then i did the same to the right side, except i think i stretched the tank tubes too far and had a little bit of gas leaking. i tried to make sure the tubes were tight and put it back. I guess i tried to turn a screw that was not the screw that attaches the rpm adjuster, and so now it is comletely loose and i cant adjust it. I would take it apart again but those screws are really hard to get 2 and i want to make sure i can ride it to the dealer.
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RE: What Have I Done - 10/25/2006 2:38:16 PM
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bushmasterAR15
Posts: 1040
Joined: 8/11/2006
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ouch, multiple carbs can be tricky, good luck though.
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RE: What Have I Done - 10/25/2006 2:40:40 PM
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Err
Posts: 824
Joined: 4/8/2006
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i thought you needed some sort of vaccum tool to sync carbs??
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RE: What Have I Done - 10/25/2006 4:29:42 PM
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abadfish
Posts: 771
Joined: 6/26/2005
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quote:
ORIGINAL: ThisisMickey
I took off the seat and raised the gas tank, without disconnecting it and while it was running turned the screw between the 2 carbs on the left and tried to listen for a better sound, but it only seemed to change the rpm speed. then i did the same to the right side, ...
Mickey, I'm not trying to sound condescending here but it sounds like you have absolutely no clue on how to sync carbs. Please correct me if I'm wrong or if there is more to this that you haven't included.
Firstly, you don't sync carbs by "listening for a better sound". The synchronization of carbs means that you adjust the vacuum pressure of all carbs so that they are the same (or at least within spec). How do you "listen" for a difference in vacuum pressure between cylinders?????????????
Your carb sync will go something very similar to this: http://cbrworld.net/forums/thread/248431.aspx
Yes, that's link is for throttle bodies (fuel injection) but throttle bodies aren't very different from carburetors in this regard.
Now assuming you left out the part where you are indeed using a set of vacuum gauges, make sure of the following:
- your idle adjustment is working properly so that you can set the idle to the right level when sync'ing
- you sync when the engine is WARM!!!!
- you sync in reference to the base cylinder (usually this is#3 for CBRs)
The sync itself should only take a few minutes to do (not including time to strip the bike). If you don't know what you're doing, take it to someone who does. Or at least get the service manual and understand what you need to do.
good luck!
< Message edited by abadfish -- 10/25/2006 4:30:56 PM >
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'05 600RR Purple/Black
 
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RE: What Have I Done - 10/25/2006 8:50:12 PM
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Jason748
Posts: 446
Joined: 10/22/2006
Status: offline
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Please for the sake of your bike.... take it to a dealer and have them fix it.....please.
Fish is absloutely right, if you don't have the proper tools, let alone know how to use them... well I'll just stop there.
_____________________________
05 CBR600RR - RACE
98 Ducati 748S - Street & Track
60 Ducati 200SS - Fun
89 RM125 - Dirt
Thanks to my 2007 sponsors: Two Brothers Honda, Lithium Motorsports, LockhartPhillips TP, CBR600RR.com
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RE: What Have I Done - 10/25/2006 10:49:48 PM
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Bobthebiker
Posts: 273
Joined: 5/26/2006
From: Hudson FL. aka the seventh circle of hell
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quote:
ORIGINAL: Err
i thought you needed some sort of vaccum tool to sync carbs??
yup. you need that tool, I think its a manomometer, or something like that, to measure the vacuum on all 4 cylinders at the carbs. if you dont have that, synching carbs isnt something you should try doing because all you'll succeed in is making a royal mess of it.
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theres no problem too big for duct tape and superglue.
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RE: What Have I Done - 10/25/2006 11:40:10 PM
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ThisisMickey
Posts: 189
Joined: 7/20/2006
Status: offline
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Ya your right...I dont know much about what i am doing, just trying to save money, i knew about the vacuum tool but it was 100$ online. And i did read your well detailed post beforehand fish i thought i could find the screws and listen for a less boggy sound, cause my bike seemed to get more and more boggy. I couldnt take it anymore just thought i would try it myself. Dealer told me $100-$200 to sync. Thanks for the advice though(and thanks for stopping there Jason:) ), i got an appointment with the dealer tomorrow.
< Message edited by ThisisMickey -- 10/25/2006 11:46:58 PM >
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RE: What Have I Done - 10/26/2006 12:05:40 AM
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abadfish
Posts: 771
Joined: 6/26/2005
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quote:
ORIGINAL: ThisisMickey
Ya your right...I dont know much about what i am doing, just trying to save money, i knew about the vacuum tool but it was 100$ online. And i did read your well detailed post beforehand fish i thought i could find the screws and listen for a less boggy sound, cause my bike seemed to get more and more boggy. I couldnt take it anymore just thought i would try it myself. Dealer told me $100-$200 to sync. Thanks for the advice though(and thanks for stopping there Jason:) ), i got an appointment with the dealer tomorrow.
Believe me, I feel your pain with just trying to save money. This is why I do 99.9999999% of my wrenching. In all honesty, I think this is something you can do yourself. IMHO, for a person who has some degree of mechanical ability, I rate this job with a difficulty of 2 on a scale of 1 to 10 with 10 being the most difficult.
think about what you just said. the tool cost $100 online. Now you're paying that much and possibly twice as much to a dealer. If you had bit the bullet and just bought the tool in the first place, it would've paid for itself after the first use. The first time I got my throttle bodies sync'ed, I was charged $120 by a shop I have the utmost faith and trust in. When I saw what they did, I was like WTF?? I could of done that so easily if had a set of vacuum gauges. The tool I have (the one used in the tutorial) I got for $125 from a company in the UK called Carbtune.
I know tools aren't cheap (and the price of them is certainly something to consider), but I justify it to myself that spending the money to buy them saves money in the long run when compared to paying for a shop to do the work. The factory service manual is so good that I can do almost all of the procedures in it without any prior experience doing it beforehand. The key to doing any wrenching is knowing what needs to be done first. Then decide whether you should try doing it or taking it to a shop. Anyway, just my 2 abe lincolns.
Good luck! I hope the shop lets you off easy. I suggest you tell them exactly which screws you messed with so they can easily determine how to fix it.
_____________________________
'05 600RR Purple/Black
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RE: What Have I Done - 10/26/2006 11:44:54 AM
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slowpoke
Posts: 518
Joined: 8/6/2005
From: Denver, Colorado
Status: offline
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quote:
ORIGINAL: mikequinn
...to get the carbs in sync' you really need to do the valve clearances 1st.
I agree. Also, there's no sense in doing a carb sync unless the carbs are cleaned beforehand. If the piston/needle's are sticking, you can sync them until the world ends, but the carbs won't run right. I also check the ignition timing now and then. You don't need any special tools to clean the carbs. Any old timing light can be used to check the timing and I think those mercury vacuum tubes are only $50 or less on ebay.
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RE: What Have I Done - 10/26/2006 1:32:29 PM
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Jason748
Posts: 446
Joined: 10/22/2006
Status: offline
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Mickey,
I'm not trying to be mean or anything, I just don't want to see you do more damage than good to your bike. I totally understand trying to save some money, I've been there before.
Fish's advise is probably the best you could get, pick up a manual and see how to do it and what you'll need to do it correctly, before blindly jumping in.
_____________________________
05 CBR600RR - RACE
98 Ducati 748S - Street & Track
60 Ducati 200SS - Fun
89 RM125 - Dirt
Thanks to my 2007 sponsors: Two Brothers Honda, Lithium Motorsports, LockhartPhillips TP, CBR600RR.com
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