Bike dropping cylinders?

[STEPHASAUR]

UPDATE:
Managed to order some gaskets from Taiwan that arrived within a week!
The pricing was great and the kit was for all the seals/ washers in the carbs, which was great as right after the float bowl gaskets are replaced the fuel started gushing out the inlet pipe of all things

Carbs were disassembled to find there wasn't much left of the old seals - a possible answer to the ever going mystery.
Just as I reached the final air fuel mixture jet, Zenki decided to do that she does best... BREAK!
The indents to fit the screwdriver snapped clean off leaving us no choice but to drill the final one out!! Thankfully the carb was undamaged.
Now waiting for a replacement to arrive which will probably be another fortnight but at least there's progress!

[STEPHASAUR]

UPDATE:
YAY! all assembled and ready to go! Except she didnt go

what I think the issue may be is perhaps the fact that the carbs have not been balanced/ tuned/ whatever you call it.
Quite possibly I have it all set up wrong as while trying to turn it over it catches something then just dies. that has to be fuel related, right?
Bike is most definitely sparking, pulse generator could also be an issue but for the moment it does seem to be behaving/
the plugs were dry, idle was set all the way up (along with choke) and the bowls are definitely filled with fuel

is there anyone auckland way who would be best recommended for this type of work?

[Drew]

UPDATE:
YAY! all assembled and ready to go! Except she didnt go

what I think the issue may be is perhaps the fact that the carbs have not been balanced/ tuned/ whatever you call it.
Quite possibly I have it all set up wrong as while trying to turn it over it catches something then just dies. that has to be fuel related, right?
Bike is most definitely sparking, pulse generator could also be an issue but for the moment it does seem to be behaving/

is there anyone auckland way who would be best recommended for this type of work?

Sounds to me like you've got the plug leads the wrong way round.

[nzspokes]

Sounds to me like you've got the plug leads the wrong way round.

Was thinking the same thing.

[STEPHASAUR]

UPDATE:
Managed to resolve the issue the evening of my last post!

I had the air fuel mixture screws wound in far too much (1 5/8th of a turn) which is just a number I saw on another forum. After winding it to 2.5 turns from fully closed the bike ran!
Now just need to finetune it as the idle was hunting between 4-6k rpm and yes, both the choke and idle adjust were disengaged. Wondering if reducing the turns to just 2 on the screws along with a check that the throttles aren't sticky etc would sort this

Won't be able to check till monday anyway, but will keep posted!
so happy the thing runs though. It's been far too long!

[STEPHASAUR]

Seems I am now plagued with this new issue.

the bike now happily idles at 2k rpm, however I find a slight blip of the throttle will bump it up to 4-6k rpm and it'll just hover there for a few seconds before coming back to rest. Both choke and idle adjust are wound all the way out, and the screws are wound back to 2.5 rotations (had wound them down to 2 which only seemed to starve it of fuel)
Adjusted the butterfly valves by eye, so they may not be 100% identical. All valves are sealed

nothing seemed "sticky" but then again I don't really know what to look out for. Perhaps still over fuelling?

[Drew]

Seems I am now plagued with this new issue.

the bike now happily idles at 2k rpm, however I find a slight blip of the throttle will bump it up to 4-6k rpm and it'll just hover there for a few seconds before coming back to rest. Both choke and idle adjust are wound all the way out, and the screws are wound back to 2.5 rotations (had wound them down to 2 which only seemed to starve it of fuel)
Adjusted the butterfly valves by eye, so they may not be 100% identical. All valves are sealed

nothing seemed "sticky" but then again I don't really know what to look out for. Perhaps still over fuelling?

Balance could be out on the butterflies. Could he an air leak. Could be a bung throttle cable.

[aprilia_RS250]

Balance could be out on the butterflies. Could he an air leak. Could be a bung throttle cable.

I reckon it's knob cheese.

[Drew]

Since you balanced the carbs by eye, I'd bet the issue is there. Balance them by ear with a small plastic hose held over the lip of the velocity stack.

[Askor]

Balancing by eye can get you pretty damn close, I reckon she has an airleak somewhere, or the idle circuit is set far too lean. Check your vacuum hoses/connections.

[Yow Ling]

too lean, wot charlie said

[STEPHASAUR]

Decided this is starting to get a bit beyond me so organised someone to come down on sat and have a look at her. Would rather have it done right the first time then make multiple repeats due to error!
Will run through all that's been suggested when he comes around!

an update will pop up sunday

[STEPHASAUR]

UPDATE:
so finally FINALLY these bad boys arrived!

http://i881.photobucket.com/albums/a...sc8fmv0cv.jpeg

Just noticed I didnt actually post an update to what was wrong, but we discovered that the float valves had rings on the rubber points (dont know the technical terms haha)

so measured up the originals and ordered these from China. Quality looks pretty good. Won't be able to throw them in and set up the carbs correct this weekend as the racecar is going in for some major work so will probably have to just sit tight and wait till the following week after work or something

fingers crossed this sorts it (or at least gets us significantly closer to completion!)

[Dannz]

Did that sort it out?