need carb help asap.

[metricbiker]

ok so the carbs are working good. its accelerating great! Thanks for the help with that all of you!

now as before i thought it was because of the carb issue i have a decelleration problem.

on decelleration the motor is sometimes losing all power like it was flooded. i would come to a stop and when i pulled the throttle it would either shut off or just spit and sputter. i can turn it off for a few minutes and itll start again.

before i fixed and installed the carbs i cleaned the plugs and they were new so i kept them. the #3 cylinder was the most fouled.

so after having this problem i nursed it home and start looking at the plugs and noticed the #3 spark plug cap was much hotter than the others. and thats the only plug getting fouled. Covered in black soot.

i started up the bike, let it warm up, got on it and went throught first and second hard to make sure it was acellerating correctly after the carb fix. on decelleration it spit and sputtered and died. nursed home and started checking the plugs and number three is covered in black soot and the plug cap is HOTTTT!!!!

please advise

[CatatonicBug]

The plug cap should be too hot to touch right after a ride. A plug being black means that is is running too rich. You need to adjust your mixture screws to compensate. This is where a colortune comes in really handy.

[skids]

It might be that either the float is set too high (short distance if using a caliper when carbs are upside down) or perhaps you have some flooding because the fuel valve is leaking. I have seen sticky floats due to corrosion in the pivot area.

[DGXSER]

Try checking the plug cap for resistance. It may be shorting out in there, causing heat and giving a very weak spark. At higher rpms, these bikes are so strong it sometimes seems a weak cylinder or miss will go away even if it is still there.

[metricbiker]

this started happening more when i went to a smaller vacuum hose from the carb boots to petcock. will change. but this has no effect on the other side.

the idle is perfect my carbs are super clean. could be a float issue. but couldnt be anything with being clean.

i know the plug caps are gonna get hot but it wouldnt take a genius to realize that plug cap was quite hotter than the other three. could this be a bad resistor?

[DGXSER]

BTW, in case you did not know, the plug caps simply unscrew from the wire, they can screw right back on. While you have the plug cap off, try also cuttign 1/4" or so of the wire off at that end. Sometimes, the plug wire itself gets a little corroded at that connection.

[metricbiker]

oh yeah good ole metric steel wire. already did that when i first bought the bike and was figuring out what was originally wrong

[motoman]

May have that float hangin' up on bowl gasket.............

[metricbiker]

#3 is having a miss. under acceleration you cant tell.

if in nuetral i just rev it up and hold it steady i can see white smoke intermittenly coming from the tail pipe.

#4 is burning perfect nice and tan #3 is getting black soot. so i know its that cylnder.

sometimes it runs fine. and sometimes ill decellerate and it all goes to ****. it start popping and idle at about 2k and if i hit the throttle it just spits and sputters or dies.


sounds like im having two different issues?

[metricbiker]

gonna try and adjust the floats when i can, then work on the miss

[motoman]

sometimes it runs fine. and sometimes ill decellerate and it all goes to ****. it start popping and idle at about 2k and if i hit the throttle it just spits and sputters or dies.


sounds like im having two different issues?

likely one and the same. Floats/needles causing erratic fuel levels possible issue.

[BA80]

It's sounds suspiciously like a pickup wire going bad.

[metricbiker]

floats sticking, pick up wire or both?

probably both? one cylinder misfiring from a pick up wire wouldnt make the engine lose all power, spit and sputter and die when i hit the throttle?

[Rasputin]

Pick up coils should affect two cylinders and both should be the same plug reading. However if one of the plug wires (from coil to plug) or the caps is a little bit Wonky then the problem may present as only affecting 1 cylinder. Float height is also suspect as you say "after stopping" which could be that the floats are so high that stopping forces the gas forward and for lack of better wording floods your bike. JAT

[BA80]

Pick up coils should affect two cylinders and both should be the same plug reading.

I agree on the plug but getting one cylinder misfiring at idle does happen at idle with a bad (or going bad) pickup wire.

The breaker plate jumps around at idle according to the vacuum of #2 cylinder so it will be approximatly the same position on each revolution. Intermittent contact or lack thereof does occur.

You might unplug the vacuum hose from the #2 boot and plug the port and see if it makes a difference.