Clinician
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Post by jmicester on May 28, 2019 19:53:38 GMT -6
Hello Folks! So years after riding and working on my 150cc scooter I decided to upgrade to a 2008 rocketa 250cc with 6000 miles. I am very familiar with The 150cc gy6 engine but I an a newbie with The 250cc. The gentleman told me it had be sitting for about 1.5 yrs did not start. The first thing I did was replace the carb, spark plug and put in new fuel. The scooter starting for about 1 sec then died. I started it again and it started for another second and died and would not start again. Would tight valves cause it? If so, how would I find TDC? Also would anything else cause it not to start? Thank you in advance!  |
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Post by kz1000st on May 30, 2019 14:27:04 GMT -6
Spray starter fluid in the carb and see if it runs longer. If yes, then the carb is clogged. Also check that the fuel pump is working. No gas, no start.
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Clinician
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Post by jmicester on May 31, 2019 12:51:32 GMT -6
It ended up being a tight valves. As soon as I adjusted them the scooter fired right up! |
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Post by kz1000st on Jun 3, 2019 13:06:52 GMT -6
Good find.
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Post by cyborg on Jun 5, 2019 6:41:59 GMT -6
Nice!!! Good job there's a piston right there
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Clinician
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Post by kcohen67 on Oct 26, 2019 13:14:27 GMT -6
I bought a Jonway Y250T as a project bike. I have WHITE Spark, GOOD Starter, and good gas, but STILL it won't start. I replaced CDI, coil, battery and spark plug. I rebuilt the Carburetor and head.I got it to start, but the Idle was rough and white smoke poured from the exhaust. I noticed the flange the carburetor was connected to had a broken broken bolt so I extracted the bolt, resealed the flange, now it won't start at all. Tried adjusting Carburetor air/flow mixture. After about the fourth cranking cycle I hear the Carburetor cough a bit, but that's it. Any suggestions? Photos and video of the repairs for Jonway Xpressway 250cc |
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Post by cyborg on Oct 27, 2019 9:20:12 GMT -6
Try introducing fuel into the carb throat and try and start it,,,if it runs for a bit then die it's a fuel delivery issue
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Senior Clinician
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Post by blu on Oct 30, 2019 9:30:13 GMT -6
I just paid $80 to find out my problem was a dirty air cleaner, so check that!
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Clinician
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Post by kcohen67 on Oct 30, 2019 9:33:29 GMT -6
Tried that. I used in weld to form a gasket for the head, I think that may be the problem now. Violent may be leaking into to piston chamber.
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Post by cyborg on Oct 31, 2019 6:56:50 GMT -6
That could be it
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Clinician
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Post by kcohen67 on Feb 25, 2020 6:59:13 GMT -6
I found out the head the blown. Since October I've changed the head, carburetor, the pistons and rings, the CDI, the Stator and pick up. But it STILL sounds the same. Many have suggested it's Timing. I brought the cylinder up to TDC and aligned the Cam with the three holes, unfortunately I can't get compression over 175psi and it STILL sounds the same. I don't have an airbox so it's not a dirty airbox. what am I missing?
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