Everette Posted August 24, 2008 #1 Posted August 24, 2008 Raining today and thought I would change the air filters and sync the carbs. Really no problem, except that I cannot seem to do it at 1000 rpms or 1050. I need it to be at about 2000 or above and it syncs perfectly. It is not that far off at 1000, but is seems this is what the manual calls for. Any ideas or suggestions? Any problems leaving it this way?
GeorgeS Posted August 24, 2008 #2 Posted August 24, 2008 I do idle, then check at about 2500, then try to split the difference. I have found that its impossible to get them perfect.
Tonto01 Posted December 21, 2008 #3 Posted December 21, 2008 How do you sinc the carbs? I have a 07 and I ride it to work, 98 miles to work and back most of it is 4 lane and I set the cruse on 70. My bike will burn around 3 gallons every day. I dont think that is very good. Avg around 33. What up? Tonto01
Sling Posted December 21, 2008 #4 Posted December 21, 2008 I did the same thing today---Cleaned the air filters (K&N) and sync'd the carbs. I also did a good cleaning of the bike (good way to inspect everything). I use the Morgan Pro Carbtune. What I do is set the RPM's up till the manometer rods settle down (stop fluctuating) and then I do the adjustments. I don't have a tachometer so I don't know the exact RPM's Tonto go to this thread and it will explain the Carb sync pocedures http://www.venturerider.org/forum/showthread.php?p=72205
V7Goose Posted December 21, 2008 #5 Posted December 21, 2008 I have synced an awful lot of carbs on these bikes, and I, too, used to think it was very common to have slightly different sync between idle and cruise RPM. Back then, I always chose to set them at 3,000 if I couldn't get them to stay synced when I opened the throttle. My theory was that I spent way more time around 3,000 RPM than I did at 1,000. BUT, I am a bit of a perfectionist, and I just HATE "close enough," so I was never really satisfied with that solution even though the bikes ran well. I have since found that with extended back-and-forth retouching of the sync between idle and cruise speeds, I would eventually get them completely dialed in so the sync was the same. So it can be done, just takes time and patience. My suggestion is two-fold: First, remember that the spec is .4" Hg difference, so if the change isn't more than that, you are good (e.g., you could even have one carb that was .4" high at idle, then .4" low at 3,000 and still be in spec if all the other carbs didn't change). Second, if the difference between idle and cruise speeds is fairly small, say less than one inch Hg, and you just can't seem to get it any better, set the carbs spot-on at higher engine speed and enjoy the ride. Finally, if you REALLY insist on them holding the exact sync as you open the throttle, then keep at it - it may take more time than you like, but you'll get it! Goose
N3FOL Posted December 22, 2008 #7 Posted December 22, 2008 The first time I synched my carbs, I set my rpm at around 1000. Make sure that your engine is nice and warm and then synch the carbs. For a first timer, it took me less than 30 minutes to get everything where I want it to be. I have never done synching my carbs are a higher rpm, since it was not mentioned in the write-up that I got from this site.
N3FOL Posted December 22, 2008 #8 Posted December 22, 2008 How do you sinc the carbs? I have a 07 and I ride it to work, 98 miles to work and back most of it is 4 lane and I set the cruse on 70. My bike will burn around 3 gallons every day. I dont think that is very good. Avg around 33. What up? Tonto01 How many miles ago since the last carb synch on your bike? I think 33 mpg is on the low side for the Venture, unless you are really aggressive on the throttle.
V7Goose Posted December 22, 2008 #9 Posted December 22, 2008 The first time I synched my carbs, I set my rpm at around 1000. Make sure that your engine is nice and warm and then synch the carbs. For a first timer, it took me less than 30 minutes to get everything where I want it to be. I have never done synching my carbs are a higher rpm, since it was not mentioned in the write-up that I got from this site. You are right, the Yamaha shop manual only says to set it at idle. But I instinctively want to verify that the carbs stay in sync as the engine revs, and that is where I first found that the majority of Royal Stars I have worked on tend to come a bit out of sync as the revs come on. I never find it hard to get the initial sync at idle, but like I said above, it tends to take a while to finally get it so it stays in sync off idle. Because I now know it is a problem, I make sure I check the sync both ways every time I do it. Goose
N3FOL Posted December 22, 2008 #10 Posted December 22, 2008 What is your final synch, higher rpm or lower idle?
V7Goose Posted December 22, 2008 #11 Posted December 22, 2008 What is your final synch, higher rpm or lower idle? Back when I thought you had to choose, I always set it perfect around 3,000 RPM and let it be a bit off at idle. But now that I know you can get it to stay in sync at both points by just taking longer, I always get it spot-on. Goose
N3FOL Posted December 22, 2008 #12 Posted December 22, 2008 I am very curious to see what my carbs would look like on my next oil change around 3600 miles and I am 1600 miles away. It may take awhile, because the weather has not been cooperating lately. The Carbtune Pro is a true must have, if you own a Venture.
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now