engine leaning out

[djmarius]

Has anyone experienced this problem?

My engine idles fine and goes ok aswell... but, everytime I give it a bit of throttle and then let go of the accelerator the engine picks up revs and screams for 102 seconds. this happens everytime.

I have cleaned out the carby but it is still happenning.

 

[Akina'sMtx-2]

Its kinda hard to understand your problem, can you please reply clearly?

 

[x_789]

Air leak almost for sure. Did you mean 10-12 seconds? 102 is almost 2 minuets.. X

 

[RobH]

This weekend, my ride would die if I gave it too much throttle. I'm think it was an air leak. I saw bubbles in the line. (i need a tiny hose clamp or something for the connection on the bottom of my tank) After I fixed the air, I couldn't get it idle so I donno if the air leak was it or not.

 

[djmarius]

it screams for 1-2sec. sorry about the bad typing. There tiny bubbles in the line so, yes it may be this... maybe the top seal on the tank.

 

[RobH]

get them tiny bubbles out and see if it goes away

 

[FastEddy]

My thoughts on fuel lines:
Buy it in bulk and replace it whenever you do regular maintenance. Doing this will make the issues of air leaks from a bad line a non issue. When buying fuel line choose a good thick brand that is CLEAR. Color line looks cool but makes it difficult to see the fuel and air bubbles. When you replace it leave additional line so you can trim the ends often without having to replace the entire line. The ends where the line connects to the fitting are the first place they will get a leak.

To secure the line to a fitting don't use a hard clamp, they will cut your line fast. I cut off a small part of line about .5 to 1 mm and use it like a rubber band clamp over the end of my fuel line. It works great. On the fuel tank or plastic fittings use an Exacto knife to cut small barbs in the plastic facing the opposite way from where the line slips on. Doing this will help keep the line from sliding off. Don't go overboard and cut to deep, you just want to scuff it up a bit.

Try to keep your lines away from heat and moving parts.

Following these few steeps should help relieve your fuel line mishaps.

-Ed

 

[RobH]

eddy how you do you do the gas tubing turned rubberband thing? my gas tubbing is to tough, I dont think I could take a little piece and stretch it over another.

-rob

 

[nitro dave]

Originally posted by NoviceRob
eddy how you do you do the gas tubing turned rubberband thing? my gas tubbing is to tough, I dont think I could take a little piece and stretch it over another.

-rob

You can do it, just give it a try. I would use needle nose pliers to stretch the cut piece...

 

[FastEddy]

Put the rubber band over the end of a needle nose pliers and open the pliers up. Close the pliers on the end of your fuel tube and roll the rubber-band on to it.

 

[RobH]

thanks!

having a huge problem with those fuel lines leaking on me

 

[NCNitro]

I do exactly what Eddy does, I have found this works much better than the little metal clips, they will also fit where the metal clips won't, like under the gas tank.

 

[RobH]

exactly where I have my problem. Under the tank, the nipple seems too small for the hose (get your minds out of the gutter). Anyway air leaks in then the thing does like djmarius described--runs fast then dies. Maybe thats his problem too.

 

[NCNitro]

Well give that a try and let us know how you make out. Any air leak will cause eratic idle and tuning problems.

 

[djmarius]

same problem still

just to update -

I have bought new fuel lines. extra thick. cut small pieces of fuel line and used them as clamps.

checked the tank for any holes or cracks.

bought new fuel filter.

put rubber washers where tank is screwed to car to minimize vibration.

Same problem!!! I can't believe it. when I rev the engine hard and then suddenly lift off the gas the engine screams even louder for another 2-3 seconds. getting real angry.

 

[RobH]

Your needles aren't set super lean are they?

Other than that, you might have an air leak or something. How does the O-ring that seals the carb to the engine look?

 

[djmarius]

The o-ring to the carb looks as new.

I have played around with the needle settings heaps.:\

Finally I set the needle back to factory specs and then turned it anticlockwise only slightly until I got the car started. Once warmed up the engine idles for atleast a minute without any intervention. But when you start reving it hard it begins to have problems.

 

[NCNitro]

another two common places that engines will develope an air leak is...

1 - The base of the carb, check the o-ring and seal your carb with either racers edge carb seal, or permatex ultra copper silicone sealant.

2 - The engine backplate, this should be sealed as well.

Good luck!

 

[djmarius]

the engine back plate? Which part is this? Does anyone have a pic?:stupid:

 

[KMN]

It's the part that the pull start or easy-start is attached too.

If you use a starter box, it's where the pull start would be.