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Post by DJHypnotiq on Sept 29, 2013 1:28:51 GMT -5
So I loaned my uncle my scooter to get back and forth to work. He's owned plenty as well as regular motorcycles, so i trust him with her and for him to take proper care of her.
well the starter went and we easily replaced that she fired right back up and was off for the races.
next day it just begin bogging down on him that if he didn't give it some throttle it would stall. he was able to get it to his house now it wont fire up. It'll turn over but that's it and the battery is fully charged.
I took off the air box to see if maybe it was dirty it still looks pretty new. But when i pulled the whole air box out and undid the clamp from the throttle I noticed ALOT of oil dumping out. So while on its center stand i checked the dipstick and the oil is right where it should be at.
Right now I'm stumped as to why she wont fire up any more as well as why its dumping oil the way it is. I'm thinking my piston rings may be shot and its time to rebuild the top end.
Any others with some insight, suggestions??? I have all winter but would really like to get the jump on this now and maybe get in one more run before the fall is over.
any help. suggestions, comments good or bad im all ears...
My Scooter info should be in my signature if not i'll edit this and put it in here...
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Post by freefour1968 on Sept 29, 2013 2:54:01 GMT -5
Did you take the plug out and inspect it . It could be oil fouled . If so a little soaking in kerosene and then a cleaning with break cleaner usually puts back to operational statis . Or if it is too far fouled might put a new plug in and see if it will run . If so that fixed the no start . Now with the oil dumping it may be that one of the rings blew and will need a rebuild . If it starts with the new plug watch for smoke from the exauhst . Some at first would be ok as it would be burning what's in the cylinder that fouled the plug but if it continues and doesn't stop after the motor has run for a couple of minutes then a rebuild is in order . Hope this helps .
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Post by gsragtop on Sept 29, 2013 9:35:59 GMT -5
Dumb question but did your uncle know it was a 4stroke and not a 2stroke??
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Post by DJHypnotiq on Sept 29, 2013 12:10:04 GMT -5
Replaced the spark plug still nothing. I do believe a rebuild is in the works. Glad eastern winters are long enough to keep me occupied with troubleshooting and gettin her going.
Yes he knew it was a 4 stroke. Not a dumb question at all. But why would you ask if he knew the difference? I just wanna know why you ask so that I can possibly check for a mistep somewheren on his part
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Post by alleyoop on Sept 29, 2013 12:33:59 GMT -5
First thing you want to do is ADJUST the Valves, if its a 150 adjust them BOTH to .004 inchs if its a 50cc adjust them BOTH to .003 inchs.
See if that gets it going.
As far as the Oil go make sure the Foam Filter that the VALVE COVER VENT hose attachs to on the Air Box is clean. If it is soaked with oil it is not venting and more oile will be squirted out. If it does not vent to much pressure builds up in the crankcase and it blows it out the hose.
That hose has to VENT.
He must be rodding the heck out of it. What I suggest is take the Valve cover Vent hose OFF the Air Box put a Fuel Filter on the End of it and tie it up Higher than the Valve cover. Then plug up the Connector on the Air Box.
Alleyoop
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Post by shalomrider on Sept 29, 2013 13:29:13 GMT -5
howdy, i think the question about whether the borrower thought it was a 2 stroke, maybe he put oil in the fuel?
lotsa miles and smiles to ya
ken
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Post by skuttadawg on Sept 29, 2013 20:46:55 GMT -5
I would remove the jets as they can get trash and film built up in them and the holes are small so any blockage makes a difference . If the diaphragm on the top of the carb is torn or has a hole in it will run bad or not at all .
All 4Ts will need the valves adjusted at some pint in time some out of the crate need it . When they get too tight they do not open up enough to allow fuel and air into the cylinder thus it stalls or will not start at all .
Im lucky my Echarm has a blowby tube so it does not blow seals or gets oil in the airfilter . It only gets a sip in the tube if I redline it for a while
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Post by scootnwinn on Sept 29, 2013 21:03:42 GMT -5
Actually when the valves are too tight the rocker arms hold the valves open and the engine has low or no compression.
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Post by DJHypnotiq on Sept 30, 2013 6:06:56 GMT -5
Thanks everyone I'm having it towed to my storage shed today so I'm out of tbe elements when working on it. First thing ill do is adjust the valves and report back
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Post by freefour1968 on Sept 30, 2013 8:50:00 GMT -5
Did you check your fuel filter , silly question but I re-read your post and the thought just came to me a clogged fuel filter would bogg down and if fully clogged shut it down . The oil I would say if it was just wet that's ok , mine is wet , but if it's truly blowing oil out the hose then that's something else like rings or valve seats . Also when you replaced the plug how did the old one look ? How did it smell?
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Post by rockynv on Oct 1, 2013 12:02:56 GMT -5
And when the valves are loose they close too soon which increases crankcase pressure and blows oil out the breather.
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Post by DJHypnotiq on Oct 1, 2013 16:11:10 GMT -5
the plug i replaced was bad it had a burnt smell to it. i also changed the fuel filter and hoses again thinking it was clogged or a pin hole (same for vacuum hoses)so those are good
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Post by urbanmadness on Oct 1, 2013 22:13:36 GMT -5
will it run on carb cleaner? Spray a little down the throat of the carb and see if she fires. If she does, you can rule out ignition for the time being... If it won't fire, then it's compression or spark. (I'm actually leaning toward spark in this case)... If you have spark and it won't run on carb cleaner, then it's time to do a compression test. It should be at least 125psi.
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Post by rockynv on Oct 3, 2013 4:32:57 GMT -5
the plug i replaced was bad it had a burnt smell to it. i also changed the fuel filter and hoses again thinking it was clogged or a pin hole (same for vacuum hoses)so those are good And do you have spark with the new plug? You could have a compound problem here too. Valves in need of adjustment and possibly a bad ignition pickup which when they fail gives you intermittant spark and mimicks fuel issues. Don't forget to check for a cracked or loose intake manifold while your in there. |
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..BAD TO THE BONE..
