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Post by geh3333 on Jun 1, 2022 20:29:46 GMT -5
I was riding my scoot pretty hard yesterday on an 80 mile round trip, and halfway home my scoot started making a weird noise which sounded as if it was in the valve area. It wasn't real loud but noticeable with my helmet on . I was riding close behind a big truck on to avoid wind resistance and I was reading between 69 and 76 mph on my phones speedo app. All of a sudden the scoot died and I pulled over . As I was stopping I heard a clank for a second and then I heard the scoot ignite and blow back through the carb and airfilter followed by some smoke . I called someone to pick the scoot and myself up and take us home. I was able to turn the scoot over but u can tell it had no compression and would not ignite. I took the valve cover off and nothing looked broken but when I check the valve clearance the exhaust valve was tight . When I tried to adjust it , the valve spring just kept against the rocker arm . I took the rocker arm assembly off , the valve spring fell off and the bottom half of the valve was left in the head. The valve shaft was still attached to the spring and retainer . I'll post a pick soon .now I have to remove the head and see if the bottom of the valve did any damage to the piston or cylinder.
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Post by geh3333 on Jun 1, 2022 20:33:56 GMT -5
I'm pretty sure the oil pump stopped working and the scoot overheated . I had oil blowing out of the gear oil breather from getting so hot.
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Post by geh3333 on Jun 1, 2022 22:06:27 GMT -5
Catastrophic failure!!
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Post by geh3333 on Jun 1, 2022 22:07:35 GMT -5
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Post by geh3333 on Jun 2, 2022 21:44:52 GMT -5
The piston skirt is pretty much completely gone and inside the engine case.
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Post by geh3333 on Jun 24, 2022 22:37:58 GMT -5
Finally got to take the engine apart and clean it out. New oil pump but im running the stock bore until i get the chance to order another 60 + kit. Im keeping the same gearing and im going to see how far i can push it with a stock bore. I honestly believe i can hit a true 65 mph and cruise around 60 mph. Its all up to how much HP i can create, so im going to force as much air and fuel possible through this thing and see how she runs . Ill post a few pics 2mro.
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Post by geh3333 on Jul 1, 2022 2:47:47 GMT -5
Dropped another exhaust valve !! Not even a mile down the road . I didnt have the rpm gauge hooked up and i know my rpms were high , so its prob my fault. Its weird . The scoot sounded and felt stronger with the stock bore and the 60 mm head i have . Either the belt was slipping or the engine really did have more power . The same trany setup was in and the same roller weights , but the rpms were really high from start up to 55 mph and then the valve dropped. I should have turned around and put heavier weights in or at least cleaned the belt and tranny parts off again.
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Post by geh3333 on Jul 21, 2022 17:33:47 GMT -5
Actually dropped both valves .
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Post by geh3333 on Jul 21, 2022 17:38:31 GMT -5
Heres the piston
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Post by geh3333 on Jul 21, 2022 17:42:24 GMT -5
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Post by geh3333 on Jul 25, 2022 20:36:57 GMT -5
Just blew a third. Something is obviously wrong somewhere. Im going to have to really inspect everything.
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Post by geh3333 on Jul 28, 2022 16:08:54 GMT -5
Just realized i was running 64mm rocker arm assembly with 69mm valves
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