Bikes, Hints'n'Tips > FZS600 Fazer

Last job is to balance the carbs, and I can't seem to get it right

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redmandan:
I posted a topic a few weeks ago and received some sage advice from you foccers. New fuel and air filters, carbs out and completely overhauled, checked my valve clearences, new plugs and caps, cooling system drained, flushed and re-filled. Got the bike back together, pressed the switch and she fired up again, no more carb overflow and firing on all cylinders.


The last job was to balance the carbs, partly because I have never done it before and partly because of a kind of ticking/ clanging sound at the top of the engine on the left side which gets better as the bike reaches temperature. After reading around a bit it would seem carb balancing could help. I read through pointer2null's post on the subject to prepare myself.


Here is a short vid of my carbs before I adjusted anything: [size=78%] [/size]


Now this is where the problems started. Rather than buying the carb tune like a sensible person I bought a cheap 4 gauge vaccuum gauge thing off amazon. To reduce needle flutter it has little plastic valves that you screw in and out on the plastic tubes connected to the carbs. The problem is that half a turn on these seems to change the readout quite significantly and I can't be sure I'm getting an accurate reading. I got 3 + 4 carbs balanced, kind of, and then I fiddled around for ages with the centre screw but all it seemed to do was increase the revs with the needles barely moving up or down.


To reduce the revs back to idle I started to also play with the idle screw. Eventually this proved futile as it seems the idle screw had no effect anymore on the revs (could it have come detached or something at the carb end?) while the revs sit at 3000 and I can't get them down anymore. I was spinning and spînning the idle screw and it had no effect. Dejected, with a wife who I had promised this would only take 20 minutes and a toddler crying for his absent father I turned off the ignition, put the cover back on and hung my head in shame as I walked back into the house.


Should have just bought the carbtune.

tommyardin:
Hi redmandan,
I purchased a set of gauges very similar to yours on the recommendation of some in here mine are blue in colour where yours are black but the gauges look exactly the same. About 45 quid if I remember right. It has four brass extension connecting rods, two are longer than the others, they came with four black rubber/plastic tubes and four cheap and nasty valves to go in line. First recommendation is get yourself down to your local tropical fish shop and get yourself four better quality adjustable valves. Around a quid/ quid fifty each.
Now I have never tried my gauges out as thus far my old girl runs smoothly. What I would say is check that the throttle cable is not too tight and holding the throttle open, if it is no amount of adjusting on the throttle stop screw will make any difference.


I'm sure other foccers will come back to you who have used the gauges just like the ones we have, and they will have more of an idea how to adjust your carbs up.
It's just that they are a bunch of old codgers that have to get to bed early because of the brain damage they have suffered because they are to foccing mean to buy the right sized helmet. Tight bastids.  :eek

unfazed:
And the worst old codger of all is Tommy, the miserable git is so tight he wears the wifes clothes  :rolleyes because he won't buy his own  :lol

There are 3 adjuster screws, one between 1 & 2 ( left as you are sitting on the bike) second one between 2 & 3 and the third one between 3 &4.

You need to balance 1 & 2 and 3 & 4 first, then balance the pairs with the centre screw.

From your video 1 & 2 are fine, adjust the Screw between the 3 & 4 which are out of balance. Then adjust the centre one between 2 & 3 to balance both sets.

They do not need to be absolutely perfect just as close as you can get them.

When finished adjust the idle speed to about 1200 and then the TPS  :thumbup

BBROWN1664:
:agree with unfazed

but

adjust the TPS and idle speed before AND after you do the balance job.

redmandan:
Tommy - that reminds me, something I forgot to mention: My throttle was acting a little strange as well. I don't think I reconnected them properly after tearing down the carbs. It's almost like it isn't springing back to idle. If I manually roll the throttle forward the revs dropped right off, almost cutting the engine out. It stays like that till I blip on the revs again. I guess there is a decent section on throttle setup in the Haynes manual that I should read through.

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