85 aero bogging after hard run then dies, fuel related.

tominos · Post by **tominos** » Sat Jul 16, 2005 10:21 pm

here's the new problem as i stated in my earlier posts.

bike will die after a hard run due to lack of fuel, i know this bc after i run it and it starts bogging, i look at the clear fuel filter and it's empty.

i figured out if i pull off the vacuum tube and suck on it so that fuel enters the fuel line, i can get the bike to start up again like normal and then it runs fine until it runs out of fuel again.

the problem seems to be with the fuel valve, i can blow on the vacuum line attached to the fuel valve and a little bit of fuel will flow out, or i can suck on the fuel valve vacuum and a little bit of fuel will flow out, but!!! after sucking on the vacuum line, ie applying negative pressure, it becomes hard to suck and no more fuel will come out, this is just after a few droplets of fuel flows out, very little fuel.

does this indicate a bad fuel valve? i have taken the fuel valve off once before and blew compressed air through it, i have yet to take out the fuel strainer though, didn't see it while i took the fuel valve off, is it stuck inside and do i have to pull it out?

does the fuel vavle stopping after a certain amount of vacuum is a pplied indicate that it's broken? should i soak it in gasoline for a few days?

vette76 · Post by **vette76** » Sat Jul 16, 2005 11:50 pm

fuel should come out for as long as u suck on the vac line. so if u are still sucking on it and it stops then something is wrong with the valve.and would explain why it runs out of fuel. there could also be a hole in the vacume line. try replacing the line first.

Post by **noiseguy** » Sun Jul 17, 2005 12:30 am

I'm not convinced this is the vaccuum petcock; the filter will usually look empty. The petcock should only see vacuum. How are your hoses, anyway? Good condition?

Try this: After the scoot stops running, put it on the sidestand and open the bottom screw. The carb will drain gas out unless it's empty. If it drips a little and stops, your problem is the petcock. If it has a bunch in it, it's probably compression.

tominos · Post by **tominos** » Sun Jul 17, 2005 12:58 am

well, i've been riding the whole day today. it's alot of fun.

it turns out that the fuel line was leaking or in the wrong position or something...

i put a clear hose on it, and tied it up with zip ties and had to play around with the angling of the hose and it flows fuel just fine now.

everything is pretty good on the bike now, except for the zinging and clanging at idle and at speed that i can't figure out where it's coming from, any ideas on this?

this is a great forum with a wealth of information and lots of knowledgeable people.

thanks for all the help guys, hopefully i won't have to keep posting on this section of the forum about my bike many more times.

vette76 · Post by **vette76** » Sun Jul 17, 2005 1:26 am

that "clanging" sound could be crank bearings.

tominos · Post by **tominos** » Sun Jul 17, 2005 1:28 am

hmm, thats kinda serious.

how can i tell for sure? can you guys tell what it is by a sound clip>?

tominos · Post by **tominos** » Sun Jul 17, 2005 1:31 am

lol and why did my title just change from unicycle to bicycle?