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Post by geh3333 on Jun 1, 2022 20:57:34 GMT -6
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 so 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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Certified Clinician
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Post by geh3333 on Jun 1, 2022 20:58:11 GMT -6
Well I removed the head and this !!
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Post by geh3333 on Jun 1, 2022 21:01:07 GMT -6
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Post by geh3333 on Jun 1, 2022 21:02:57 GMT -6
The end of the valve shot directly through the piston!!
The NCY head really let me down !!
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Post by geh4444 on Jul 1, 2022 1:50:46 GMT -6
Dropped another exhaust exhaust valve!!
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Post by geh4444 on Sept 5, 2022 18:04:58 GMT -6
Well after 3 blown top ends i figured out a couple issues . One being a bent and twisted pitson rod. So i oredered a new crank and 63mm top end . I bored the case out myself with a few dif files and im awaiting all the parts. The crank is here and the top end " cylinder and head " will b here 2mro. The gasket set and new rocker arm assembly might b here 2mro. Cant wait
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