lean condition?????

[Ironhead]

last couple times I've been able to get on my scoot, the thing runs like chit. Start it up (full pull on enrichener)
let it sit running for a few minutes (2 or 3), then take off, about another 2 minutes or so, go to half pull, then closed a minute or so later, same as always. but anyway, the thing sounds and runs fine sitting at idle.
once going, if I try giving it too much throttle (getting it) it cuts out, popps, cracks, falls on it's face. I have to very slowly work it to get up to 50mph or so.
once there, I can hammer it, and it will still popp and crack a second or two, but will build up speed, and once I hammer it hard for a mile or so, it seems to run ok, till I am back at slow idle speeds, then if I give it any throttle it does the same thing.

I am thinking this is a lean condition, and haven't had a chance to check anything yet, but I am thinking it could be a bad seal from the carb to the intake....

does that sound like it could be the possible culprit?

[gruss]

Check the seals Josh.....It does sound like a lean condition to me.....Combined with the temps your running in....
any pinging ?

[Ironhead]

nope no pinging, cept the normal durring cool down when I park it

was going to yesterday, but I just rode it for about 5 miles with my Dad, he on my OL's bike,
soon as we got home I just parked it and walked away (whole family was over for a cook-out)

will check it out later today, I am thinking it has to be the carb to intake seal.....so you are probably right gruss. I was initially thinking the A/F mixture screw had backed out, but if that were the case, it would run like chit even on start up, but I will check that also

[Motive]

Have you just recently hit deep into the reserve? Sounds lean, for sure, from clogged jets, petcock, fuel filter, or maybe low float.


My .02

[gruss]

Motive may be onto it as well Josh......

[gruss]

last couple times I've been able to get on my scoot, the thing runs like chit. Start it up (full pull on enrichener)
let it sit running for a few minutes (2 or 3), then take off, about another 2 minutes or so, go to half pull, then closed a minute or so later, same as always. but anyway, the thing sounds and runs fine sitting at idle.
once going, if I try giving it too much throttle (getting it) it cuts out, popps, cracks, falls on it's face. I have to very slowly work it to get up to 50mph or so.
once there, I can hammer it, and it will still popp and crack a second or two, but will build up speed, and once I hammer it hard for a mile or so, it seems to run ok, till I am back at slow idle speeds, then if I give it any throttle it does the same thing.

I am thinking this is a lean condition, and haven't had a chance to check anything yet, but I am thinking it could be a bad seal from the carb to the intake....

does that sound like it could be the possible culprit?

Seals go bad all the time Josh, even on the new machines, and when the motors get used in extreme heat, it amplifies the problems.....I.E. parade duty type riding etc.
Be glad its not an E.F.I. bike , then you have a whole new can of worms.....they pre-detonate badly when hot, or over heating on slow rides..
mine had a bad seal at 9k miles....
Do the starting fluid spray test around the intake seals. You'll know right away, but make sure the motor is hot, and fully expanded first. Some times a cold motor wont show the problem..

[JimP]

Could there be a bad gas problem?

[blacksheep]

Usually bad seals will make it run bad all the time. Blockage in the main or pilot jet.

[Ironhead]

someone else suggested possible moisture in teh float bowl....so that would act like a clogged jet too, wouldn't it

[Motive]

Yep, seeing as water is much less combustible...possibly water in the tank from the condensation..which can lead to rust in the tank, which can clog up the fuel system...etc...

Water in the bottom half of the bowl, will only be noticeable when you go deep into the bowl (WoT etc...) regardless, it's not enough fuel in the bowl for acceleration, but plenty for idle.

just my .02

[Ironhead]

well, here shortly I'm gettin going on the tins again, then Iwill dig into the carb to see what the issue is

[gruss]

check those seals before you tear it down.......(hint, hint)

[Glyde]

Had an accelerator pump go bad and cause the type of problem.

[Ironhead]

GLyde, that was the first thing I thought about when it started happening, I had to change the acc pump diaphram in my OL's carb right after we got her bike due to that. I dismissed the idea thinking it would be a gradual condition forming, not something that would hit all at once, but it might be worth checking into as well.

All I know is it has to be something in the carb, so it shouldn't be hard to find once I start inspecting things

I'll keep everyone posted

[Ironhead]

the plot thickens....
dropped float bowl, clean
carb to intake boot type seal, looks good
jets are clean

Acc pump diaphram looked a little weak, but no holes or cracks. it is made of a rubber coated nylon mesh, well you could see the rubber was worn thin on a couple spots to where you could plainly see the white mesh, but no light was showing thru it.

SO, as I am working on another project, I am sending wife to the dealership for an acc pump diaphram and a new carb to intake seal just for good measure. will change both of those and see how she does