need help guys..PLEASE By rcq78 (Read 2,817 times)

[JR]

Bob I did adjust my valves at 8800 miles and fuel pumps do lose pumping ability too in fact some pumps best life span is 2 years? If it is not providing enough fuel at the high range then it'll bog and also just like you said may take a little time to recover before it starts up again and runs right.

The fuel pump is a local buy at the auto parts and also you could test yours? T he GPH on that pump is 42 GPH which is about 0.70 GPM. You could get a gallon jug and unhook the line and test it? It should fill a gallon jug in about 1.25 minutes.

JR

[rcq78]

I have another 54b & it has the same set up & has never had any problems...it has 13500 miles on it...I have not adjusted the valves for 5000 miles & it still runs great....So,do you think it could be the valves??? It does idle great.....It's my wifes scoot that is having the problems & she ain't happy...it's going to get really nice this coming week & wants to ride...I'm going to pull the diaphram out of my 54b tomorrow & see what happens..I hope it's the problem.....Bob

[JR]

The exhaust valve is the one that acts stupid. And at 13k they usually settle in and don't need it near as often. I adjusted mine at 8800 and it's at nearly 11k now. Runs great too. My wife has the 250a same scooter and it had to be adjusted at 3500 miles.

And as far as the fuel pump I was suggesting ideas especailly ones that cost nothing to check. The more I think about it the more I say lack of fuel at high speed. You're going to change diaphragms and that's a good idea and not only should you put your's in hers then put hers in yours. If yours does the same then "homerun"! but if not then you need to think fuel pump.

[rcq78]

Ok,if the diaphram don't work I will check out the fuel pump...thanks...

[alleyoop]

I am laying my bet on the Diaphgram
Good luck
Alleyoop

[rcq78]

well,I could not get the top off of the carb on the scoot that runs fine,so I didn't change out the diaphrams...
What I did was pull the carb off the one thats having the problems & what I found was a little gas in the tube from the airbox & gas in the area of the intake where it clamps around the carb...I'm so confussed...it looks like it's flooding out by looking at this....But yet,when it loses power or dies out there is nothing no matter whjat you do to the throddle....So,help guys...I'm actually thinking about a new carb,But I hope it cures the problems I'm having.....The last time my wife rode it, it ran great,but when she pulled in the driveway I noticed the fuel bowl drain screw down by the cvt was open a little & leaking gas,so I screwed it in tite but never took it back out until I fixed the swingarm bushings...while doing that it sit in the garage with no airbox on it....then the first ride it started doing this....like I said it idles grerat,but falls flat on its face at 55-65 mph....What I don't understand,why does it idle great & it's good a low speeds,but maybe floods out at high speed.......Well,need help here PLEASE...Bob

[alleyoop]

I don't understand why you could not get the top off IT has only two screws right on top?

You have to try something WHY NOT take the running CARB off and putting that on then and see if it fixes the probem.
But if you have gas in the tube and by the intake it is getting to much fuel. And may I say it could the electric fuel pump to strong. Does it have a regulator on the pump to lower the PSI on it.
Alleyoop

I have been saying from how you describe what happens and if you BACK off the THROTTLE and it bogs but recovers that is a condition of to much fuel.

[rcq78]

well it don't do nothing when I back off throttle.....the fuel pump has been on there for 4 years...why would it be a problem now,as long as it's working....

Well switched the diaphrams around & took the scoot with no problem & with the diaphram from the bad scoot for a 5 mile ride & it ran great no problems at all......

Dam I hate to pull the plastics off of the good scoot to get the carb off...The wire to the enrichener is back in there & I can't unhook the enrichener....So I would have to pull off the plastics......I'm at a lose....wife wants to find a shop to fix it....Not sure I want to do that....

[JR]

Two things now come to mind Bob. If the carb drain was leaking and you tightened it up and then let the scooter sit then the float very well could be sticking and/or a little trash in the carb. I had this happen one time also and it felt like the classic water in the fuel and I pulled over, opened up the drain screw and drained out some water and trash.

But you've cleaned the carb and it indeed did have trash in the high speed jet which happened to my wifes scooter also once. So you may have a bad tank of fuel also?

What Alley is saying is the fuel pump may be over riding the float needle and giving it too much fuel and that can happen with electric fuel pumps when the carb needle is dirty or worn. Again you said it is 4 years old and do remember Bob it's Chinese. A 4 year old carb and fuel pump especially on a scooter can all of a sudden have problems.

Myself I'm still leaning on the fuel pump is now weak but we have no way of knowing unless you either test it for flow or change out the carb/diaphragm to see? It's not hard to completely change your carb to your wife's scooter either. If it runs like a top like I said before HOMERUN.

You ask the question of how could it be a prolem now as long as it's working? At this point none of us know the answer without doing the process of eliminations and this is what we suggest. Sometimes troubleshooting on a scooter like any mecanical device is a process of elimination, when all common sense known things don't cure the problem then you look at other things and when we do solve this (and we will) then we can all add this to the list of knowledge for future reference.

I would change the carb if I couldn't get the cover screws out of mine. We wait for your findings and are here to help.

JR

[JR]

Bob you can change out the carbs without pulling the plastics. That enricher wire just plugs in and you can trace it out and cut the ties and such and unplug it from the top. I've pulled the carb on mine easily from the top. Just pull the battery cover and it'll come out.

JR

[rcq78]

I understand what your saying,but my enricher wire seems to be wrapped around the frame of the bike.....So,would have to pull the plastics off...So after 4 years you think the fuel pump may now be putting out to much pressure,is that possible...This is really pissing me off...nothing against you.....it's me...Bob

[JR]

Yes Bob I know it's kind of wrapped aroung the frame and it's zipped tied in the harness mess around that area but I was able to lay down with a good light and see that from the bottom right above the muffler area and take my wire snips and get it loose enough to pull it out so I could unplug it from the top. I hope you can too.

Yes I know you're not pissed at me, been in your shoes, makes you want to pull your hair out.

No I'm not saying it's putting out too much pressure but just suggesting it could be over riding the carb float needle. If that needle is just a hair off or is worn then the fuel will keep going through it instead of shutting off when the float bowl is full.

Again we don't know yet until you change this carb? Again these are just suggestions because we now know your diaphragm was not bad but I still am leaning to a faulty carb, if not then fuel pump but I say it's weak and not putting out enough fuel at the higher range?

If you can swap carbs it'll tell us a lot. JR

[JR]

BTW Bob you can pull the enricher out of the carb by removing two little screws that hold it in and not unplug it at all. Just pull yours out and then put hers back in.

JR

[alleyoop]

Without buying anything that is what I would do, swap carbs. It could be the Carb NOT closeing the fuel inlet and fuel keeps coming in and flooding it. It could be the rubber tip has crud on it or the hole itself or the float level is off and allowing to much fuel.

Or you can test the carb on the problem child take it off and see if the float and plunger are closeing the fuel inlet hole to stop fuel from coming in when float reaches its level.
Alleyoop

See the plunger it is rubber and it may be worn or build up on it and it is not closeing off the fuel. Also the hole inside may have some build up in it.




TO test if it is shutting off the fuel Hold the Carb with the Float like in the picture and Put a hose on the Fuel Inlet and BLOW and push the float up softly to try and close off the air coming in.

[rcq78]

Hey,I will try that...I thank you for your help,I just hope together we can find the problem......I may take the plastics off tomorrow & pull that carb off,but not today......I'm not going to give up.....Agian thanks for your help....Bob