please help bike won’t run

nickaloadien

New Member
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4:32 PM
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Oct 11, 2022
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I’ll try and make this as short as possible. Bought a 100/79cc niome kit from amazon like I always do decided to step into new territory and buy a basic reed valve (still don’t understand what these do) and was told to make a windowed piston. Decided to buy a PZ19 carb for more power not sure if that was necessary also bought a new pipe. Put everything together and the bike ran !! it was working fine but then it stopped running, would only spark for a bit then cut out. i’ve tried everything: Changing needle clip position, drilled slightly larger jets, bought NT carb and upped that jet, took off reed valve put piston port.

The last thing i’m thinking is that the windowed piston is giving way too much air so i’m gonna buy a new piston and not window it, not run reed valve or bigger carb and just do what i’m used to and if that don’t work i’m throwing this bike in the dump. Maybe I ported it wrong
 

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Building a reeded engine is not an easy task. Especially for a beginner.
 
Check cdi.. just cuz it has spark doesn't mean it's enough of it.. use a multimeter and check resistance of stator coil and the cdi box itself.. depending on which coils you have the values will vary somewhat. The stator coil is usually from 320ohm to 370ish. A new stock 320ohm coil mine wouldn't start even with a new cdi. I upgraded to a 390 that worked fine.. now I've got a 480ohm with a super strong magneto and the "upgraded cdi" that produces spark something close to God's own ⚡⚡⚡. Cdi box should be around 20kohm I believe.. between the blue (or red depending on which unit you have) and the plug wire.
 
Check cdi.. just cuz it has spark doesn't mean it's enough of it.. use a multimeter and check resistance of stator coil and the cdi box itself.. depending on which coils you have the values will vary somewhat. The stator coil is usually from 320ohm to 370ish. A new stock 320ohm coil mine wouldn't start even with a new cdi. I upgraded to a 390 that worked fine.. now I've got a 480ohm with a super strong magneto and the "upgraded cdi" that produces spark something close to God's own ⚡⚡⚡. Cdi box should be around 20kohm I believe.. between the blue (or red depending on which unit you have) and the plug wire.

Moderators Note:
The OP of this thread was last seen in this forum Nov. 26th and has not answered his own thread he started here Oct. 11th ...I doubt he will read or answer at this point.
 
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