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Post by wiscootsin on Jul 14, 2020 23:28:20 GMT -5
bought an eton beamer ii from a college student. non-running of course. thought it would be simple but. of course he didnt know it had a 70cc kit on it...had 90psi but crank/bearings whatever went bad.
I actually did drive it down the street, only got to 20mph and blew tons of smoke and had lots of resistance.
Anyway. anyone know what brand this cylinder is and if its possibly usable somehow? I tried to get a picture of some scoring on the piston. theres something real slight on the cylinder too but hard to tell/see in my pictures i'm realizing.
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Post by Zino on Jul 14, 2020 23:48:09 GMT -5
Cant help identifying the cylinder .
That exhaust port looks like it is destined to catch a ring .
Is the cylinder head good if you could pick up the Naraku kit .
That will bring that scoot back to life with some power.
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Post by 190mech on Jul 15, 2020 3:57:54 GMT -5
Looking at the scuffs on the piston and ex port wear,I'd say the piston was installed backwards..Only part worth keeping is the head as Zino said...
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Post by wiscootsin on Jul 15, 2020 7:35:58 GMT -5
Thanks for info.
After taking the piston and head off there was still some resistance moving the crank. But I don't totally know how to tell when crank or bearings are bad. Im not sure its 100% toast but I figured this is a good opportunity to put the genuine roughhouse 50 engine onto something.
I think some big chunks of dirt got in (airbox was broken/hanging from carb) and caused the damage. If my first action on bringing home was to take the top end off and clean everything out i think it could have been ok.
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Post by jaysan on Jul 15, 2020 18:48:58 GMT -5
Looking at the scuffs on the piston and ex port wear,I'd say the piston was installed backwards..Only part worth keeping is the head as Zino said... How could it be installed backwards ? Don't they only go on one way ? Newbie here |
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Post by wiscootsin on Jul 15, 2020 18:50:25 GMT -5
Looking at the scuffs on the piston and ex port wear,I'd say the piston was installed backwards..Only part worth keeping is the head as Zino said... How could it be installed backwards ? Don't they only go on one way ? Newbie here He means upside down with the exhaust ports up. |
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Post by 190mech on Jul 15, 2020 19:32:18 GMT -5
The piston has an arrow cast into the its top,that points toward the exhaust port..The ring locating pins are always away from the exhaust port..If the piston is installed backwards,the piston ring locating pins are in the exhaust port area,that allows the ring gaps to expand and scrape inside that port,cutting deep ridges in that area,it self destructs in short order because the installer wasnt sharp enough to know up from down!!Tools should be taken away from that installer and send him to a covid infested bar room!!  |
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Post by wiscootsin on Jul 15, 2020 19:38:41 GMT -5
The piston has an arrow cast into the its top,that points toward the exhaust port..The ring locating pins are always away from the exhaust port..If the piston is installed backwards,the piston ring locating pins are in the exhaust port area,that allows the ring gaps to expand and scrape inside that port,cutting deep ridges in that area,it self destructs in short order because the installer wasnt sharp enough to know up from down!!Tools should be taken away from that installer and send him to a covid infested bar room!! The arrow on this piston actually points up and not toward the exhaust port. So that can't have helped. |
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Post by Zino on Jul 15, 2020 19:41:16 GMT -5
Kinda falls in the Category
How to make a hundred dollar paperweight and get a workout pushing your scooter home .
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Post by Mech Warrior on Jul 16, 2020 10:49:01 GMT -5
If 190MECH said it , you best believe it is Gospel.
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Post by wiscootsin on Jul 16, 2020 11:04:13 GMT -5
I think partsforscooters sells discounted pistons with arrows pointing the wrong way.
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Post by fugaziiv on Jul 16, 2020 11:30:34 GMT -5
I think partsforscooters sells discounted pistons with arrows pointing the wrong way. Not that I'm currently aware of. We may have had a bad batch a while ago, as it happens, but nothing that I can think of recently. Matt |
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Post by wiscootsin on Jul 16, 2020 11:33:46 GMT -5
I think partsforscooters sells discounted pistons with arrows pointing the wrong way. Not that I'm currently aware of. We may have had a bad batch a while ago, as it happens, but nothing that I can think of recently. Matt Yea i saw them on there at some point. |
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Post by Mech Warrior on Jul 16, 2020 12:35:51 GMT -5
Oh boy i feel sorry for the fool who bought one and installed it with arrow pointing at exhaust!
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Post by geoffh on Jul 16, 2020 15:14:33 GMT -5
To be honest I installed a piston upside down,the engine would run but only for a few seconds,in my defence I have no training or 2stroke buddies to shoot the breeze with and I totally missed the instruction in the Haynes manual to any newbies fitting a piston logic suggests that the arrow should point upwards,I am sure there will other "fools" sat at that bar with me  Geoff |
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