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Post by petrolhead773 on Jan 17, 2019 11:56:21 GMT -5
My scooter has 3k miles on it with all stock parts, so how many miles I'm able to do with 52mm kit with stock crank before it goes bad? (Using 50%-75% throttle most of the time)
Also sorry for my bad English, English isn't my primary language.
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Post by dexameth on Jan 17, 2019 11:59:51 GMT -5
It really depends... the bearings are the first to go. I put 13,000 miles on a motor that I pulled from a junk yard with a 52mm kit with no issues. It really all depends on riding style, oil changes/quality of oil, building up with proper torque specs, etc.
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Post by KSR Moto on Jan 17, 2019 12:43:46 GMT -5
Today I was in a hurry and I just started my taotao atm 50 and run it wot on cold engine, after 5 min my crank bearing(variator side) failed and it is a stock engine 39mm
I own this scoot for a month but I belive that it had maybe one oil change in it's life
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Post by GrumpyUnk on Jan 30, 2019 14:02:16 GMT -5
Longevity dependsmore on how the engine was treated than miles. Doing a short warm up period before going wide open throttle is a good thing. It allows the piston/rings/cylinder to accommodate a bit to their size changes with temperature changes. With a short warm up they can conform over a bit of time rather than while being worked hard. Oil change intervals where the particle, contaminant, and vapor/water levels are kept low will also increase lifetime. If you ignore it, and run the oil for a long time, the additives that help protect the cam followers and bearings mayh get depleted, along with the anti-acid chemicals. Byproducts of combustion get into the oil from blowby, and likely have water included. The water can form an acid(weak) when combined with blowby contaminants. Changing the oil removes the water and the blowby stuff, along with soot, carbon, and other material.
Just take care of it, let it warm up at least a minute before getting on it, and hope for the best.
tom
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Post by dexameth on Jan 30, 2019 14:26:38 GMT -5
a short warm up period before going wide open throttle is a good thing. It allows the piston/rings/cylinder to accommodate a bit to their size changes with temperature changes That would explain this:   Piston rings got too hot, closed up and only had one way to go (well, 2 ways I guess... once it started fluttering like a butterfly) |
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Post by SMALL CC TEK on Jan 30, 2019 16:13:16 GMT -5
a short warm up period before going wide open throttle is a good thing. It allows the piston/rings/cylinder to accommodate a bit to their size changes with temperature changes That would explain this: Piston rings got too hot, closed up and only had one way to go (well, 2 ways I guess... once it started fluttering like a butterfly) Hey that piston looks like a NOS ring land fail or part of the rings ! What you on the juice lol |
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Post by fugaziiv on Jan 30, 2019 16:36:50 GMT -5
That would explain this: Piston rings got too hot, closed up and only had one way to go (well, 2 ways I guess... once it started fluttering like a butterfly) Hey that piston looks like a NOS ring land fail or part of the rings ! What you on the juice lol This is a certified NO2 ring land fail, Dexameth's looks compression and heat related.  and here's a NO2 Rod fail on a 180cc GY6... and look how deformed the skirt is. This one was a case breaker and made a big fireball out of the carb. Good times. I miss racing. Build 'em and break 'em.  Matt |
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Post by SMALL CC TEK on Jan 31, 2019 20:08:37 GMT -5
Matt : I am surprised it did not lift the head off ! Custom piston time the turbo style piston with thick ring lands and coated .. Nice pics i like seeing the parts after ....
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Post by fugaziiv on Feb 1, 2019 9:56:16 GMT -5
Matt : I am surprised it did not lift the head off ! Custom piston time the turbo style piston with thick ring lands and coated .. Nice pics i like seeing the parts after .... GY6's are actually pretty tough when all of the parts are made from quality Taiwanese parts. Everything on the engines was Dr. Pulley and SSP-G. That broken rod was from racing NO2 blown 232's in King of the Hill as we shredded our class earlier in the day (Taida 180 builds didn't stand a chance). We dialed the NO2 waaaaayyyy up, but didn't have time to retard the timing further... and ran it anyway. With a stock crank. Which up until that point took a surprisingly massive amount of abuse. We originally had a SSP-G 187 put together that we promptly destroyed during test and tune, and Tom (our tech guy, maybe I can get him back on the forums. He left a while back) built this replacement engine in the dragway parking lot in a couple of hours. We didn't bring a spare SSP-G crank however so we had to run stock. Anwyay, in King of the Hill, we took the big bike off the line and made it about 100 feet before this: http://instagram.com/p/BTH3v6kj81a I was laughing so hard inside my helmet that I had no idea I was on fire until I heard them yelling at me to get off the bike over the loudspeaker. And here's what the bike looked like before the race: http://instagram.com/p/BS1pr2rD65d Matt |
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Post by GrumpyUnk on Feb 4, 2019 13:40:43 GMT -5
I can attest that the ring lands will deform .... if you leave the shrouds off.
"We doan need thoze. They put them on at the factory so the motorz look good. Ive run them without shrouds for years..."
The rings seem to get welded to parts of the lands, and break free of the piston itself. The cylinder had some slight scoring that a 'bottle brush' glaze breaker might clean up.
Wonder what hp the NOx fed machines produce...
tom
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