Carb balancing...

[bikemonkey]

I have the RVF rubber clamps, with the spacer in them. Does that not stop you over-tightening them? As I've tightened them til they just squeeze onto the spacer.

Yeah I've put all the screws and washers back in properly. Would buying new washers help (are they crush washers)?

[Neosophist]

I have the RVF rubber clamps, with the spacer in them. Does that not stop you over-tightening them? As I've tightened them til they just squeeze onto the spacer.

Yeah I've put all the screws and washers back in properly. Would buying new washers help (are they crush washers)?

I've never replaced any of those.

What are your actual symptoms now?

I know you said that the fluid changes the RPM but it could be sucked into the airbox.

Use a straw on a can to spray only around the rubber joints to isolate that. Tigthen the clamps a little more if you have issuse and repeat.

[bikemonkey]

Haven't done any more tests as yet, I've been at work all of today.

I'll try what you suggested and post back tomorrow.

[bikemonkey]

Right haven't managed to get any tests done today as I've been busy, but I've just rode over to my mums and after a trip to the petrol station I stopped at a set of lights and the bike cut out. It's been struggling to idle for a while if I'm honest.

Blocked pilot circuit? Mixture screws too lean?

Anyway I'm going to re-do the air leak tests soon. Should the revs raise almost immediately, or should there be a slight delay? Seemed to be a delay last time, but I wasn't using a straw to spray directly onto the rubbers.

[pip]

Carb rubbers can 'settle in' over time.
If the carbs are correctly seated & still leaking, slacken all 8 clamp screws & remove the spacers, don't over tighten a gentle nip will do.

Pip

[bikemonkey]

Right so just managed to get some time in the garage.

Used a straw on my GT85 can and sprayed the carb rubbers one by one with it.

I seem to have pinpointed a leak to cylinder 4.
I checked that the carbs were seated properly, and they were, so I tried loosening the clamps a little at a time which didn't work. Then I tightened them back up again with no change.
So I took everything off and replaced the offended carbs clamps with some NC30 ones and tightened it all up, making sure I had the carbs seated properly.

Still an air leak.

When I first started the bike up I noticed it seemed to have a slight pop out the exhaust while on the choke, like there was a slight misfire. Plus it needs a little throttle every time I start it to make it catch. Has full choke on when cold too, but not when warm.

Anyway when I took the carbs off I noticed a small amount of petrol sitting in the rim of each carb rubber. The bike hadn't been turned off long though.



Here is a video of the revs. The first rise is me spraying the GT85 around the cylinder 4 rubber. Then I rev the bike and the idle drops like its struggling then slowly returns to normal. I had the idle set about 2k revs because it just doesn't seem to want to idle below that.

http://s1126.beta.photobucket.com/user/ ... 6.mp4.html

[bikemonkey]

I'm completely stumped as to what to try next.

I think I might get some new plugs, as I have a hunch they are about fudged. But that won't solve the air leak....

Anybody any ideas on the air leak problem?
The carb rubbers are new, the carbs have been re-jetted, balanced, float heights set and mixture screws all at 1.75 turns out. And the carbs are properly seated. Hence I'm stuck.

[Neosophist]

I'm completely stumped as to what to try next.

I think I might get some new plugs, as I have a hunch they are about fudged. But that won't solve the air leak....

Anybody any ideas on the air leak problem?
The carb rubbers are new, the carbs have been re-jetted, balanced, float heights set and mixture screws all at 1.75 turns out. And the carbs are properly seated. Hence I'm stuck.

dont waste your money on plugs, that wont be affecting the idle I woudnt think.

The carbs artn seated properly.

Set the mixture screws to 2.0 turns out, even 2.25 to start with.

[bikemonkey]

I'm sure the carbs are seated properly, I've inspected each one with a torch. They pop into the rubbers nicely and I can see no way that they aren't in. But maybe I need a more experienced eye to take a look.....

I had the mixture screws richer before and I had the problem where the bike just wouldn't hold an idle after revving it, and it was all spluttery. I'll try 2 turns out though, see if that helps.

[Neosophist]

I'm sure the carbs are seated properly, I've inspected each one with a torch. They pop into the rubbers nicely and I can see no way that they aren't in. But maybe I need a more experienced eye to take a look.....

I had the mixture screws richer before and I had the problem where the bike just wouldn't hold an idle after revving it, and it was all spluttery. I'll try 2 turns out though, see if that helps.

Then if the mixture screws arnt working at the proper setting something is wrong >.<

Try them at 2 first of all and let me know how it changes teh bike and we can go from there