KymcoForum.com
General => General Discussion => Topic started by: catsailor on June 09, 2011, 01:52:55 PM
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Yikes!,
I think i messed up bigtime. I got a People 50 two stroke a few months ago. Seems like all restrictions were removed, and she really moved. I wanted to get to work a little early this morning, and was cruising along at wot with the speedo pegged, for more than a few minutes. All of a sudden she just died. Once she came to a stop, i noticed some smoke coming out of the crankcase cover vent. Once I let her cool down for 20 minutes or so, I tried to start. Seems like I have lost all compression. Turns over easy and fast. What are my options here? I should have never pushed her so hard.
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Since you like to go fast, it would be a good time to get a bigger scooter.
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Ouch is right. Sounds like you blew the head gasket, at the very least.
Are you looking for advice or just sympathy? I feel your pain.
If it is turning over then it is not seized, which is hopeful.
Looks like you have a little project on your hands or your mechanic will be excited to see you.
Look for parts for GY6 50cc engines. Get a big bore kit if you are interested in more power.
Good luck
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Just look for GY6 2 stroke big bore kit? I have done the big bore on my honda spree and it worked well. One thing I had to do was add 2 stroke oil to the gas in conjunction with the oil pump, because the oil pump could not keep up with the displacement of the big bore. Will this be necessary with a big bore on this. Would like to have to do the least bit of tuning possible.
Since the engine is freely turning over, could this just be a matter of changing out the head gasket? Will that be the fastest way of getting back on the road? If piston and rings appear to be in tact, should they be replaced anyway, or can I just replace the head gasket and move on?
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I am looking for the gasket kit, piston/rings, or a big bore kit for my 2 stroke people 50 motor. What is the model of the engine on here so that I can find? are the head and base gaskets product specific, or can a generic gy6 gasket be used. Has anyone done a big bore on their engine, and if so, what kit? Results? Thanks for your help.
Todd
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If I were to be looking for parts for a 2 stoke people 50 motor, would it be a minarelli type, jog type? I am having a hard time identifying the proper parts to get for gaskets, pistons, bigh bore kit, etc. I would love to get my order in with whoever Im buying from, so that I can get it fixed. Please help?
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I don't know what engine the people 50 2T has, but the gy6 engine is a 4T. Did you run the engine out of oil? It sounds like you won't be riding it so, for me, I would be pulling the cylinder to see what damage has been done. You might be able to hone the bore get away with a piston and ring kit. If you try ebay you might find some engine parts, quite a few scooter parts sellers on there.
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Will be pulling apart this coming weekend. Was hoping to find engine type so that I can order right away on ebay. I am quite possibly thinking of putting a big bore in, if i can get the info that I need. Thanks sid. you were a huge help on last problem. This one unfortunately was caused by me. I did not run out of oil, I ran it a wot for at least 5 miles on a 98 degree day. Can you say dumbass?
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Not much, but a start, hardly a bank breaker. Enough to get you back on the road, depending on what you find when you open her up.
Just remember, you will need head and base gaskets as well, probably exhaust gasket also.http://www.ebay.com.au/itm/50cc-PISTON-KIT-KYMCO-Dink-DJ50-People-Spacer-/280651864991?pt=UK_Motorcycle_Parts&hash=item4158279b9f (http://www.ebay.com.au/itm/50cc-PISTON-KIT-KYMCO-Dink-DJ50-People-Spacer-/280651864991?pt=UK_Motorcycle_Parts&hash=item4158279b9f)
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Is the People a horizontal or vertical engine? The eason I ask is that they list the same piston for the ZX, that may be another route for a BBK.
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Gasket set.
http://www.ebay.com.au/itm/TOP-END-GASKET-SET-KYMCO-Grand-Dink-50-People-50-/280662000394?pt=UK_Motorcycle_Parts&hash=item4158c2430a (http://www.ebay.com.au/itm/TOP-END-GASKET-SET-KYMCO-Grand-Dink-50-People-50-/280662000394?pt=UK_Motorcycle_Parts&hash=item4158c2430a)
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Thanks for coming through again sid. I think I will just buy the piston and gasket kit for scooter assasins. Not sure if it is vertical or horizontal. If you were looking at engine mounted, the head and spark plug are between 2 and 3 o'clock, based on a regular clock. Can you help with the big bore?
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Yeah, sounds like a hrizontal engine, Zx kit won't fit, must be a common piston.
Sorry, no big bore,,, yet.
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sid,
again thanks a million. I just ordered the piston set, as well as the 3 gasket set. thanks for the heads up. Will break motor down this weekend and wait for the parts to come in. Will keep posted once the parts come in and i install.
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Hope you get them quicker than I do. Seem to wait forever down here. :)
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they say 5 to 11 working days for delivery here in states. hope that is the case, and closer to the 5. I would love to be back on the road by next weekend. I should have kept my spree as a backup.....
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Dude I run mine wide open all the time. I don't think that was the cause of the problem. How many miles on it?
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only 3600 kilometers on odometer. I have not yet pulled apart, but feel it could be modified a bit. She has a ton of pick up (almost does wheelies) to 30 mph, sluggish to 35 mph, and then will run up and bury the needle of the speedometer. I have verrified speed on GPS of over 50 mph. This is why im guessing there have been modifications. I am really feeling that the wot situation caused my problem. Pulled plug, and it looked a little lean, but not that bad. Will keep you updated as I start to take apare and get my parts in from Scooter Assassin.
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I was able to take the top end apart last night. From what I can gather the first owner installed an Airsal Big Bore Kit.
(http://i802.photobucket.com/albums/yy302/catsailor/DSC_0313.jpg)
I looked at the Piston and this is what I have:
(http://i802.photobucket.com/albums/yy302/catsailor/DSC_0312.jpg)
(http://i802.photobucket.com/albums/yy302/catsailor/DSC_0310.jpg)
There is a pinhole through the 1 ring piston (I have never seen a 1 ring piston before). I have a few observations, assumptions, gripes.......
1. I installed a bbk on my Honda Spree. A few things were necessary in order to run properly. First, the carb needed to be up jetted. I also had to drill some hole in the airbox in order to get more air in. Airbox on my People appears to be stock with no modifications. I have not yet pulled apart the carb to see the jet. What is the stock jet size? Has anyone installed one of these and if so, what jet was used? Were there any modifications to the airbox?
2. On the Spree, it was necessary add an extra 2 oz of 2 stroke oil per gallon of gas, directly into the fuel tank to compensate for an oil pump that was only designed to handle the displacement of a 50 cc engine vs the 66 cc that the big bore kit gave me. I was not aware that a kit was installed on this scooter when I bought it. I have been driving it for over 2000 km with straight 87 octane gas in the tank, and synthetic 2 stroke injector oil in the oil tank. For those that have installed BBK's on their Kymcos, are you adding extra oil to your fuel tank to compensate, and if so how much?
3. Where do I get a replacement piston and gasket set for this BBK? I measured the piston, and it is about 47.5 mm. From what I have found on the internet, this appears to be a 72cc kit. The Stock piston is 39mm. I have ordered The stock set from Scooter Assasins, and suppose I will have to return it once it finally gets here. In the meantime I need to find a replacement piston, rings, and gasket set for this Airsal kit, preferrably here in the states.
Any inshight on any of this would be big help.
Thanks,
Todd
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Firstly, for info on the Airsal kit, send a pm to Shaka, he will know the local suppliers for the parts. It looks like the ring locating pin has been ripped out. Also looks like the result of running not enough oil. When I put the 50mm kit on my ZX, I tried using the stock carb and exhaust, seized the engine. I finished up using a 24mm oko carb, per sig. and I now premix 40:1, as you said, the oil pump is designed for a 50cc engine. Is that an aluminium cyl. or cast iron?
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Ring Locating Pin? What is that, and where on the piston would it be? The head and jug are cast aluminum. Did you have to upjet and/or change the airbox also? Have you disabled the oil pump completely, and gone with straight premix, or are you just adding X amount of oil directly to the tank? If so, what is X? (sorry for the algebra lol)
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A small pin in the ring groove to keep the ring gap in one place, so it doesn't snag in one of the ports. I replaced the 14mm carb with a 24mm one, removed the air box and use a cone filter. I have removed the spindle from the pump and premix at home. I use metric so am not familiar with imperial measures, I mix 250ml of semi-syn oil with 10 litres of fuel.
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So do you think that I need to split the case and flush it out with oil to take care of the metal shavings from the piston, as well as the ring locating pin? Are you in OZ? My catamaran was built there. Great boat, and a great group of guys I have met from OZ on the boat forum.