So I was given a New-old scooter, trouble starting/idling  By  thebigk (Read 1,474 times)

First thing, check the compression. If you don't have a gauge, just put your thumb over the hole and press the starter, if it blows your thumb off you're good. Check the plug and be sure it isn't gummed up and the gap is right.

Next, check the valves. The number one cause of hard starting on gy6 motors is valves out of adjustment. Set them both to .004, or the intake to .004 and exhaust to .005 (exhaust can use a bit more room, after all the gas has expanded).

While checking your valves, give your intake manifold a real good look over. Tiny cracks can cause air leaks that will give you all kinds of headaches.

Let us know if this all checks out.

Glad to hear you got her going!

If you do upgrade to a BBK, be sure and inspect those valves, they probably could use lapping after being super tight (too tight allows burning/deposits on the edges), or you could get a performance head along with the BBK (highly recommended).

Performance coils are hit/miss. I used one for less than a year before it failed on me, put the stock back on and it's still going strong.

A uni air intake and free flow exhaust will help, but you will also need to rejet your carb to compensate for the increased air flow.

A larger carb is only needed if you get the BBK or do both the uni air intake and free flow exhaust. It's really only necessary if you do all three, do any one of them and your stock carb will be fine.

Racing CDIs are not much of a boost. If you go with a BBK, then you might want an advancing (not advanced) angle CDI, tvnacman sells them and several members including myself swear by them. They don't advance at startup, which keeps you from suffering kickback (hard to start, and hard on the motor). They advance as the RPMs increase, which is what you want.

If you will be riding mostly with your wife, you will want to fine tune your CVT weights accordingly, most likely go down a gram. This will allow the engine to get to a slightly higher RPM before engaging the CVT, meaning a bit more torque to take advantage of with your double rider situation.

However....

In order to have good throttle response with you and your wife, I would definitely suggest a BBK. After installing the BBK, you can then fine tune the CVT weights to get the response you like. Remember, there is no replacement for displacement!

Compression,Fuel Delivery,Air,Strong Spark=Running GY6

This is what Jerry is talking about the NYCSP0007 you will need to select from the drop down menu ac or dc .

John

TURN THE KEY TO ON and Test the BOTTOM wire on the 2 plug on the CDI, if it registers 12v it is a DC CDI if not it is a AC CDI.
If you use a LIGHT TESTER if it lights up it is a DC CDI.
Alleyoop

Thanks, tvnacman. Just ordered the DC unit.

Just to double check --- the OEM unit has the following stamped on it:

top:  
Zhongr1
D111-hycdi
121225

Bottom:
XDZ
ZN150T-7-04

That a DC unit?>

I forgot to mention that this is a XY-157QMJ , researching more, the 2 bolt valve cover might make most of the upgrades a deal breaker! I have an extra long case, so the crankshaft upgrades are a no go

I will have to measure the heads and see if the BB is actually upgradeable, maybe I'll just upgrade the smaller scooter with a regular length case, and 4 bolt case. Might as well make my ladies scooter very fast