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Post by skooter on Mar 11, 2011 21:08:20 GMT -5
I have a scooter that i've been trying to get running for a while now.
50cc Bashan
I finally got it started and it idled, carb adjusted etc. I went for a test ride and it started to sputter out.
I checked it out and lots of oil in the air box and dripping from somewhere. I also noticed a vent tube that came off the top of the motor near the carb with oil on it.
Does anyone have any ideas of what is wrong?
It has lived a long life of 13,101 miles.
Did it just give up? bad rings? bad vent tube? cracked head? other ideas?
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Post by Fox on Mar 12, 2011 1:52:52 GMT -5
Did you pull the oil strainer to see if there's metal floating around in there?
The oil coming from the tube means that crankcase pressure is too high probably because there's clogged oil return passages in the cylinder head so the oil comes in from the pump but does not drain back down so it all comes out of the crankcase vent tube into the air box finally puddling on the ground. I'd say the engine is probably due for a complete replacement or just buy a different scooter altogether with the same design and you'll have some spare parts.
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Post by 90GTVert on Mar 12, 2011 7:49:31 GMT -5
With 13,000 miles, I'd suspect a possible piston ring issue.
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Post by Fox on Mar 12, 2011 12:32:14 GMT -5
Bad valve guide(s)...  |
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Post by skooter on Mar 12, 2011 12:52:48 GMT -5
Thanks for the info everyone. I am going to do an oil change and check the vent tubes again and if that doesn't work I'll pull the motor and inspect and possibly order a new top end kit.
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Post by 90GTVert on Mar 12, 2011 14:30:18 GMT -5
I almost forgot.. :welcome: ;D
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Post by felliott on Mar 12, 2011 18:10:54 GMT -5
Is the oil overfilled? To much oil in engine will also cause this.
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Post by skooter on Mar 12, 2011 18:29:29 GMT -5
I did a fresh oil change today and added about 700mls
I took the plug out to dry everything out, and cranked it over, and gas came out of the cylinder.
Hopefully it will dry out and restart...if not i'll be looking for a used/new motor, or a top end rebuild.
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Post by skooter on Mar 13, 2011 12:43:34 GMT -5
UPDATE:
Well After an oil change and new plug, I was able to get my scooter started and idling. I took it for a test ride and at low throttle it was accelerate, but at wide open throttle it bogs pretty noticeably.
I only ut back on 1/2 of the air box because it's still drying from when i cleaned it after oil got everywhere.
If I used an A/M air filter will the carb need to be re-jeted? Will the complete air box help?
How can i get rid of this bog?
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Post by lshigham on Mar 13, 2011 12:50:13 GMT -5
Put the air box back together, completely.
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Post by skooter on Mar 15, 2011 10:42:49 GMT -5
I put the full airbox back on and it runs much better. The bog is pretty much gone.
But my RPM gauge seems to not work correctly. I starts way to the right and only goes to about 4K RPM's. Is this electrical or mechanical?
Is it adjustable, or could something else be wrong? A bad connection on a wire or is the rectifier going bad?
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Post by 90GTVert on Mar 15, 2011 14:47:53 GMT -5
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Post by skooter on Mar 15, 2011 16:11:16 GMT -5
Thumbs up to you! Also, how much was the speedo, and does it work well? Easy install? |
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Post by 90GTVert on Mar 15, 2011 17:06:51 GMT -5
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Post by rocketdog on Mar 15, 2011 18:56:46 GMT -5
Here's a video of my GY6 150 comparing the Stock Tach to the Tiny Tach. Big difference.  Don't use the stock tach for tuning. RD |
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