syncing carbs

[mtthwmrks]

How much work is it to sync the carbs.. like is it worth doing it urself or paying a shop to do it

its a 92 750

[kingsley]

You'll need a Carbtune or Mercury stix or make your own manometer (lots of info on the net) , I used 2 cycle oil in mine. Takes a little time, but is kinda fun.
Forceps for hooking up vacuum hose and a very short screwdriver for adjustments are handy when working in tight quarters that will be HOT.

(on my old 750 of course, as now I'm FI, yea!)

[mtthwmrks]

Thanks.. the local shop wants like 300 or so for that and if i spend 50 on tools i know that i can do it myself... im not cheap by any means but id rather know its done right and everything

[OldPueblo]

If you haven't done it before and don't have the tools, I say it's worth it to have a shop do it. However, if you local shop wants $300, I say it's time to find another shop!

Figure an hour of shop labor for R&R'ing the tank if necessary and another hour for tuning time, and a few "shop supplies". Even at $85.00 per hour, it should be under $200.
If you do choose to do it yourself, 4 cheap vacuum gauges from Harbor Freight tools, attached to a board of some kind, works well.

[Fizz]

Originally Posted by mtthwmrks

Thanks.. the local shop wants like 300 or so for that and if i spend 50 on tools i know that i can do it myself... im not cheap by any means but id rather know its done right and everything

I just got a Throttle Body sync (my FZ1 is FI) for 65 dollars from a smaller (but very reputable) shop. My local dealer quoted me 85 dollars.

300 is WAY out of the ballpark. It takes longer to set up the sync than it is to actually do it.

Shop around.

[Fizz]

Originally Posted by kingsley

(on my old 750 of course, as now I'm FI, yea!)

Fuel Injected bikes still need to have throttle bodies synced, exact same thing as a carb sync.

[Lgn001]

If you plan on checking/adjusting the valve clearances yourself, it is probably worth investing in a sync tool of some kind, since the carbs should be checked if the valve clearances are adjusted. And you will probably also need a special tool to loosen, adjust and tighten the sync screws.

Personally, the best thing about doing it yourself, besides the satisfaction, is that you are not on the clock and can take as much time as you want checking things over, such as fuel lines and hoses.

[Sye]

It's not difficult and in the UK once you have done your carb balance you have recovered the cost of the gauge. Take a look here for a guide on how to do it on your bike:

750 91 - 97 Carb Balance Guide.

[cybrstar]

I used the yard stick tool (DIY) with a 2 carbs on a V twin, worked great. My question for those that used the same yard stick tool....

How do you sync it with only 2 lines? do I have to make another one yard stick tool and hook it up to the other carbs?

Which carbs to I hook on the same yardstick? 2 rears together/2 fronts together and measure so that all are synced? or 1 tube to 1 front carb, and the other tube to the opposite rear carb?

[crustyrider]

OOO OOOOO I think I know this one......they all have to be sync'd to the primary carb usually number 2 (from the left as you sit on the bike) I think I read that somewhere but dont quote meon the number carb but I'm pretty sure about the rest

[kingsley]

I used a 2 column on my '97. I believe the "reference carb" is #1 for the 4th gen. (check manual). So I synced the other 3 off of it. My 2-cycle oil has far less density than mercury (abt 1/15), so getting 2 readings within a couple of inches on the differential manometer, is very close. After 3 adjustments, go back through them and check again. Make SMALL adjustments and blip throttle.
I would probably make the 4 column if I did it again.

Here's a shot of the forward adjusters



and short video..

[RVFR]

Coo, l don't ya love the internet.. Me I had a shop do it, then they ran it on a dyno to make sure it was as good as it can get.