|
Post by magoconnor on May 31, 2019 18:08:29 GMT -5
It seems to operate just fine. What the hell is wrong with this damn engine
|
|
|
Post by niz76 on Jun 1, 2019 17:07:30 GMT -5
I've had some scoots that would only "idle" with the throttle held open a bit. It turned out the idle jet was clogged and it was only idling with the throttle open because the main jet and needle were now coming into play... Idle jet good?
|
|
|
Post by GrumpyUnk on Jun 2, 2019 11:53:51 GMT -5
Checking the idle jet is a difficult task. Looking through the jet, it is ALMOST impossible to see light come through the aperture. You can blow through the jet, and place a finger such that you may feel the airflow(other end... ), but it is difficult. One could poke a hole in a piece of cardboard, stuff the jet into the hole, and use the cardboard to shield light from a good source, while looking down the float to be sure you CAN see some light. To clear plugged jets, the only thing I found that worked for gunked up jets is using a 'stray' bristle from a wire brush. Find a bristle that is bent out of place, and all by itself. Poke that bristle through the idle jet. If the jet is open, the bristle can go through without problem. It can take some pokery to get it through, but you will feel the jet move through blockage if it exists. tom
|
|
|
Post by magoconnor on Jun 3, 2019 12:51:07 GMT -5
I will check the carburetor again, tho I have already clean it twice. The plug is wet, so its getting plenty of fuel. Can the idle jet still be clogged?
I pulled the engine and checked the timing, and all is good.
I also checked that the valves can move freely. I also filled the chamber with fuel and no leaks where found. So the engine is good.
so its either the carb or the ignition.
|
|
|
Post by magoconnor on Jun 5, 2019 11:35:52 GMT -5
Anybody got a sorta list I can go through? I really want to get this engine running.
What I have checked so far with the ignition: Charging ac output for the cdi meassures 65 watts, when cranking over the engine. The trigger pickup meassures 0,8 watts when cranking. The cdi has a good ground on the 4. pin.
|
|
|
Post by dexameth on Jun 5, 2019 13:42:43 GMT -5
I had to go back a few pages to remind myself the scenario going on here...
Are you still getting black smoke while it's attempting to fire up? I see you have chased a lot of options, which is good, but I still think you are running waaaaay to rich at idle.
|
|
|
Post by magoconnor on Jun 5, 2019 18:32:28 GMT -5
Yup the smoke is still there.. Im using a stock glixal 20mm carb with a 94 main jet. The pilot jet is unknown.. But it worked fine, when I had a 72cc bbk installed
|
|
|
Post by dexameth on Jun 7, 2019 8:28:53 GMT -5
Well, I think you should get a good 34 idle jet to start. Make sure you are getting a baseline with known factors. Your unknown idle may just be WAY too large, my guess. Once you can get a baseline we can go from there.
The 94 should be fine with a pod filter, maybe too rich with a stock airbox. The symptoms of wet plug, black plug and smoke is 100% indicator of too rich.
|
|
|
Post by magoconnor on Jun 7, 2019 14:26:52 GMT -5
Do you know where I can buy idle jets for the 20mm glixal carb in europe? or atleast a place that ships to europe.
|
|
|
Post by dexameth on Jun 7, 2019 14:55:21 GMT -5
You will need this size jetting. We do ship internationally but it can be expensive, even just for jets. If you wanna DM me your address I can get a quote drawn up. I don't know of anyone in Europe other than Racing Planet but they only have the Naraku Kit with 35-58 sizes (too big I'd say)
|
|
|
Post by magoconnor on Jun 7, 2019 17:58:47 GMT -5
Import taxes where I live are So it will probaly be way too expensive for what its worth, but thanks. The thing I dont understand is, it worked just fine with the 72cc and the stock head. How can it be too rich for the 90cc with the Bvh?
|
|
|
Post by magoconnor on Jun 10, 2019 11:39:11 GMT -5
I borrowed a size 28 pilot jet from a friend, but little did it help. The situation is still the same.
I think I've just about tried everything, is the next step just a gentle push into the nearest ocean?
|
|
|
Post by jloi on Jun 10, 2019 13:05:27 GMT -5
I made the mistake of buying a cheap carb - duh - online. After about 3 mos . of driving , not driving , adjusting everything under the sun etc. I finally pulled the idle air mixture screw out of the carb - and the tip on the end of it was missing- broke off - straight from the factory , cause I hadn't had it out previously . I had same basic symptoms you describe . Different scooter but I just thought I'd pass this on . Net result of this for me was when I put a new screw in the carb the scoot cranked right up like a champ , ran beautifully .... for about 5 minutes . Died ; never to start again. Finally bought a compression gauge , checked it and 0 compression . I think driving it and working on it with all the richness must have flooded the cylinder with gas ... long term . Goodbye rings . Not 100% sure . My best guess .
|
|
|
Post by magoconnor on Jun 15, 2019 19:20:27 GMT -5
Okay, I hope you got your bike fixed, but thanks for the tip, it might just have lead to a possible break through.
So I pulled the air/fuel screw to check the tip, and the screw looked fine... But the O ring at the end of the screw, had crawled up on top of the spring, instad of making a seal against the carb.
Here is how the air/fuel screw normally is assembled: Screw - spring - metal washer - o ring - carburetor.
Here is how mine was: screw - spring + o ring crawled up on the screw sprial turns - metal washer - carburetor.
So obviously the o ring was not sealing or had any influence at all. Could this be the problem? Im outta town for a few days so I have not had the time to check.
|
|
|
Post by jloi on Jun 16, 2019 10:15:09 GMT -5
wow... I'm no expert but I'd say that might just cause erratic flow of gas . Fer sure. I guess that would cause it to run rich ? So, if it was up on screw threads/spirals it probably wouldn't close enough ? or too much? Anyway , let me know what happens ; maybe need a new O ring .
Since my latest carb keeps running rich I'm gonna go look at my own screw too.
|
|