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Post by Alleyoop on Mar 31, 2016 14:23:01 GMT -6
AH now you tell me, so you only felt some pressure. Well here is what you can do to find out if its the valves or rings, take the plug out put a teaspoon of oil into the plug hole and re-check the compression, remember HOLD THE THROTTLE WIDE open it has to get as much air as possible otherwise the compresion will be low.
Then tell me if by doing that with the oil it had more pressure on your finger, if it did then its your rings.
Alleyoop
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Post by sooonmitch on Mar 31, 2016 14:58:05 GMT -6
So I did add the oil like you said and I cant hold my finger over the spark hole anymore. It has more compression when the oil is put it. But when I add the spark plug back I cant get it to start still. (Hoping it would atleast run a little before it dies again)
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Post by Alleyoop on Mar 31, 2016 15:08:29 GMT -6
Great!! we found the problem your motor does not have enough compression to run. You need to re-build the top end. So the best thing for you to do is just get a 47bbk that will give you everything you need PLUS you will have a little more power it will be a 72cc motor.
Alleyoop
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Post by sooonmitch on Mar 31, 2016 15:15:59 GMT -6
Do you recommend one for my engine? The scooter is a Roketa Bahama 2008 and the engine is a gy6 50cc? I would like more power but I have a 50$ debit card right now so that is my range. I would love to get the part sooner than later also.
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Post by sooonmitch on Mar 31, 2016 15:31:05 GMT -6
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Post by Alleyoop on Mar 31, 2016 15:33:05 GMT -6
Since you will have to tear it down to fix it might as well go a little bigger and get a little more power. I am sure the you have metal parts in the crank from pieces of the rings breaking off and the JUG side walls will be all scraped. So Yes I would recommend it for your motor, if it is a 139QMB here is one under 50 bucks. www.ebay.com/itm/like/191194685870?lpid=82&chn=ps&ul_noapp=true |
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Post by Alleyoop on Mar 31, 2016 15:35:17 GMT -6
That is just the gasket look at the rings around the piston. Also look down into the side walls of the jug to see how bad it is scored.
Picture of the piston and rings and the inside where the piston fits
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Post by sooonmitch on Mar 31, 2016 15:45:57 GMT -6
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Post by Alleyoop on Mar 31, 2016 15:50:42 GMT -6
Check the rings on the piston if they look good and are not missing bits of metal and no metal bits are in the oil when you drain it then just buy the gaskets and give that a shot. The piston looks really good not scored or anything.
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Post by sooonmitch on Mar 31, 2016 16:34:43 GMT -6
Pretty sure the exhaust valve was leaking also. I am just going to order a kit for it and get a head to go on it. I will post when I get it and add it on about if it was fixed
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Post by Alleyoop on Mar 31, 2016 16:39:20 GMT -6
Great! We know the motor is loosing compression so a top end re-build is really the way to go and not piece meal it.
Alleyoop
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Post by sooonmitch on Apr 4, 2016 20:58:06 GMT -6
Alright, installed the new stuff. Runs great! Except a small problem. When I am riding the scooter it some times like to bog down when giving gas. Almost like having a choke on
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Post by Alleyoop on Apr 4, 2016 21:11:58 GMT -6
The problem is a fuel delivery problem not enough fuel so it BOGS. Did you put in a BBK or STOCK re-build? If a BBK then which BBK? because you will need to up jet the carbs MAIN JET. If just a stock re-build then all you need to do is adjust the carbs FUEL RATIO MIXTURE.
So little more info from you of what you did.
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Post by sooonmitch on Apr 5, 2016 6:48:24 GMT -6
The kit was a small upgrade from a 50cc to 80cc motor. The motor has already had this 80cc kit in it before and ran fine. I just had to buy a new one to replace all the gaskets/piston with the new ones. It randomly bogs is my issue. So when I am riding, I can open it wide open or a little bit and it will ride like a dream. Just every so often I will be riding and it will try to bog down for a couple seconds but then it recovers.
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Post by Alleyoop on Apr 5, 2016 11:28:43 GMT -6
Check the fuel line and fuel filter sounds like a slow delivery of fuel.
Alleyoop
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..BAD TO THE BONE..
