idle problems?

[porndoguk]

coppied from my earlier post however this is a little separate and i need to get some ideas on what the problem is please help

Rick

i have her running i stripped the throttle handle and cables out to lube and clean as i seem to have problems getting the carb to idle correctly. ill tell you what i have done and see if i have missed anything out

carbs jetted 118 front 120 rear
slide drilled to 2.5mm dia
needles all raised 0.5mm (now 1.0mm)

all butterflies manualy synched with drill bits until vacuum clocks/guages go on to be fine tuned.

all screws on 4 carbs at 2.25 (2&1/4) turns thats 2 full turns not easily done half turns

throttle off on bottom of carb with 1x 10mm lock nut
throttle on on top of carb with 2x 10mm lock nuts

bike is currently fueled with normal unleaded as the optimax was sat dormant i believe so scrapped it, will be fueling up with vpower tomorrow when i get her out

when the bike idles its sits at 3.5k quite high tbh, when i put extra pressure on the throttle to close the revs drop nicely to 1.5k but when i steadily let go the revs slowly pic up back to 3.5k again

what could be the cause bare in mind i havent riden her yet as ive not managed to get the plastics back on yet.

i hope this gets seen so i can hopefully get this last niggle sorted

thanks Rick

[Neosophist]

coppied from my earlier post however this is a little separate and i need to get some ideas on what the problem is please help

Rick

i have her running i stripped the throttle handle and cables out to lube and clean as i seem to have problems getting the carb to idle correctly. ill tell you what i have done and see if i have missed anything out

carbs jetted 118 front 120 rear
slide drilled to 2.5mm dia
needles all raised 0.5mm (now 1.0mm)

all butterflies manualy synched with drill bits until vacuum clocks/guages go on to be fine tuned.

all screws on 4 carbs at 2.25 (2&1/4) turns thats 2 full turns not easily done half turns

throttle off on bottom of carb with 1x 10mm lock nut
throttle on on top of carb with 2x 10mm lock nuts

bike is currently fueled with normal unleaded as the optimax was sat dormant i believe so scrapped it, will be fueling up with vpower tomorrow when i get her out

when the bike idles its sits at 3.5k quite high tbh, when i put extra pressure on the throttle to close the revs drop nicely to 1.5k but when i steadily let go the revs slowly pic up back to 3.5k again

what could be the cause bare in mind i havent riden her yet as ive not managed to get the plastics back on yet.

i hope this gets seen so i can hopefully get this last niggle sorted

thanks Rick

Throttle cable too tight? You can adjust the on / off cables with the locking nuts to put some slack in them.. if pressing the throttle back slows it down your cables / idle adjuster are too tight / in to far

[porndoguk]

the idle screws are each at 2.25 each when i put them in it has a flat spot from acceleration and when i screw out it gets faster, with the balancing having anything to do with it?

[Neosophist]

the idle screws are each at 2.25 each when i put them in it has a flat spot from acceleration and when i screw out it gets faster, with the balancing having anything to do with it?

there NOT idle screws, there PILOT SCREWS, you have 4 of those, one on each carb.

the idle screw is the turney adjuster (you only have one) thats changes the idle speed.

viewtopic.php?f=24&t=14524

Follow CAM's guide on how to set up the carbs properly.

If you look here

http://images.cmsnl.com/img/partslists/ ... 0_0d59.gif

Number 7 (middle of picture) is the idle screw adjuster.. it runs to where the throttle cables too.. if you turn that in it opens the throttle slightly and increases your rpm :)

[porndoguk]

the idle screws are each at 2.25 each when i put them in it has a flat spot from acceleration and when i screw out it gets faster, with the balancing having anything to do with it?

there NOT idle screws, there PILOT SCREWS, you have 4 of those, one on each carb.

the idle screw is the turney adjuster (you only have one) thats changes the idle speed.

viewtopic.php?f=24&t=14524

Follow CAM's guide on how to set up the carbs properly.

sorry yes idle screw is completely open (the turny thing) the pilots are as per cams post and i followed that precisly step by step and covered my laptop in oil

any other ideas fella?

[Neosophist]

the idle screws are each at 2.25 each when i put them in it has a flat spot from acceleration and when i screw out it gets faster, with the balancing having anything to do with it?

there NOT idle screws, there PILOT SCREWS, you have 4 of those, one on each carb.

the idle screw is the turney adjuster (you only have one) thats changes the idle speed.

viewtopic.php?f=24&t=14524

Follow CAM's guide on how to set up the carbs properly.

sorry yes idle screw is completely open (the turny thing) the pilots are as per cams post and i followed that precisly step by step and covered my laptop in oil

any other ideas fella?

If your idle screw is totally open the bike shouldn't run, so i'd say your cables are deffinalty too tight!!

Take the throttle cables off the carbs! (you can do this with the carbs on the bike) and start the bike up.. when you turn the choke off it'll probably die or idle really low :)

Try that first and see how you get on. If this fixes it you'll need to put more slack on the throttle cables (the idle screw is supposed to be up a bit)

if that doesn't work you probably have an air-leak! but we'll move onto this after the throttle cable :)

[Cammo]

when the bike idles its sits at 3.5k quite high tbh, when i put extra pressure on the throttle to close the revs drop nicely to 1.5k but when i steadily let go the revs slowly pic up back to 3.5k again

First thing to check would be to rule out whether its the throttle cables or carb settings causing these dramas.

Try taking the throttle tube off the bar (or cables out) and pull and release the 'pull' cable to see if it helps it. If it drops down to a nice idle doing this then obviously the cable (or throttle grip snagging on the bar) is the problem.

If it still misbehaves using the pull cable as the throttle then it's probably an air leak to do with the carb mounting - can happen very easily!

A process of elimination. Hope this helps!

[porndoguk]

when the bike idles its sits at 3.5k quite high tbh, when i put extra pressure on the throttle to close the revs drop nicely to 1.5k but when i steadily let go the revs slowly pic up back to 3.5k again

First thing to check would be to rule out whether its the throttle cables or carb settings causing these dramas.

Try taking the throttle tube off the bar (or cables out) and pull and release the 'pull' cable to see if it helps it. If it drops down to a nice idle doing this then obviously the cable (or throttle grip snagging on the bar) is the problem.

If it still misbehaves using the pull cable as the throttle then it's probably an air leak to do with the carb mounting - can happen very easily!

A process of elimination. Hope this helps!

Excellent idea will try that in a bit, whats the best way to find leaks? carb cleaner/brake cleaner sprayed in the vacinity?

[Neosophist]

Yep

While its running set the idle speed to a fast idle and spray carb cleaner at the rubbers.. any change in RPM and you have an air-leak!

[porndoguk]

ok will try this the weekend if not before,

if it was out of balance slightly would it cause it to rev up a lot more?

any idea on how i go about making a temporary fuel tank?

and whats the correct route for the throttle cables?

sorry for the questions but could be slowly getting there hopefully :)